Hadoop YARN Change Log

Trunk - Unreleased

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-2438. yarn-env.sh cleanup (aw)

    YARN-2472. yarn-daemons.sh should jsut call yarn directly (Masatake Iwasaki
    via aw)

    YARN-2437. start-yarn.sh/stop-yarn should give info (Varun Saxena via aw)

    YARN-2796. deprecate sbin/yarn-daemon.sh (aw)

    YARN-2980. Move health check script related functionality to hadoop-common
    (Varun Saxena via aw)

    YARN-3168. Convert site documentation from apt to markdown (Gururaj Shetty
    via aw)

    YARN-3199. Fair Scheduler documentation improvements (Rohit Agarwal via
    aw)

    YARN-2280. Resource manager web service fields are not accessible
    (Krisztian Horvath via aw)

  OPTIMIZATIONS

  BUG FIXES

    YARN-524 TestYarnVersionInfo failing if generated properties doesn't
    include an SVN URL. (stevel)

    YARN-1471. The SLS simulator is not running the preemption policy 
    for CapacityScheduler (Carlo Curino via cdouglas)

    YARN-2436. [post-HADOOP-9902] yarn application help doesn't work (aw)

    YARN-2525. yarn logs command gives error on trunk (Akira AJISAKA via aw)

    YARN-3002. YARN documentation needs updating post-shell rewrite (aw)

    YARN-2428. LCE default banned user list should have yarn (Varun
    Saxena via aw)

Release 2.8.0 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-3345. Add non-exclusive node label API. (Wangda Tan via jianhe)

  IMPROVEMENTS

    YARN-1880. Cleanup TestApplicationClientProtocolOnHA
    (ozawa via harsh)

    YARN-3243. CapacityScheduler should pass headroom from parent to children
    to make sure ParentQueue obey its capacity limits. (Wangda Tan via jianhe)

    YARN-3273. Improve scheduler UI to facilitate scheduling analysis and
    debugging. (Rohith Sharmaks via jianhe)

    YARN-3357. Move TestFifoScheduler to FIFO package. (Rohith Sharmaks 
    via devaraj)

    YARN-3356. Capacity Scheduler FiCaSchedulerApp should use ResourceUsage to
    track used-resources-by-label. (Wangda Tan via jianhe)

    YARN-3350. YARN RackResolver spams logs with messages at info level. 
    (Wilfred Spiegelenburg via junping_du)

    YARN-2868. FairScheduler: Metric for latency to allocate first container 
    for an application. (Ray Chiang via kasha)

  OPTIMIZATIONS

    YARN-3339. TestDockerContainerExecutor should pull a single image and not
    the entire centos repository. (Ravindra Kumar Naik via raviprak)

  BUG FIXES

    YARN-3197. Confusing log generated by CapacityScheduler. (Varun Saxena 
    via devaraj)

    YARN-3305. Normalize AM resource request on app submission. (Rohith Sharmaks
    via jianhe)

    YARN-3205 FileSystemRMStateStore should disable FileSystem Cache to avoid
    get a Filesystem with an old configuration. (Zhihai Xu via ozawa)

    YARN-3351. AppMaster tracking URL is broken in HA. (Anubhav Dhoot via kasha)

    YARN-3269. Yarn.nodemanager.remote-app-log-dir could not be configured to 
    fully qualified path. (Xuan Gong via junping_du)

    YARN-3241. FairScheduler handles "invalid" queue names inconsistently. 
    (Zhihai Xu via kasha)

    YARN-3383. AdminService should use "warn" instead of "info" to log exception 
    when operation fails. (Li Lu via wangda)

Release 2.7.0 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES
  
    YARN-2179. [YARN-1492] Initial cache manager structure and context. 
    (Chris Trezzo via kasha) 

    YARN-2180. [YARN-1492] In-memory backing store for cache manager. 
    (Chris Trezzo via kasha)

    YARN-2183. [YARN-1492] Cleaner service for cache manager.
    (Chris Trezzo and Sangjin Lee via kasha)

    YARN-2186. [YARN-1492] Node Manager uploader service for cache manager. 
    (Chris Trezzo and Sangjin Lee via kasha)

    YARN-2236. [YARN-1492] Shared Cache uploader service on the Node 
    Manager. (Chris Trezzo and Sangjin Lee via kasha)

    YARN-2188. [YARN-1492] Client service for cache manager. 
    (Chris Trezzo and Sangjin Lee via kasha)

    YARN-2189. [YARN-1492] Admin service for cache manager.
    (Chris Trezzo via kasha)

    YARN-2765. Added leveldb-based implementation for RMStateStore. (Jason Lowe
    via jianhe)

    YARN-2203. [YARN-1492] Web UI for cache manager. (Chris Trezzo via kasha)

    YARN-2738. [YARN-2574] Add FairReservationSystem for FairScheduler. 
    (Anubhav Dhoot via kasha)

    YARN-2881. [YARN-2574] Implement PlanFollower for FairScheduler. 
    (Anubhav Dhoot via kasha)

    YARN-2427. Added the API of moving apps between queues in RM web services.
    (Varun Vasudev via zjshen)

    YARN-2217. [YARN-1492] Shared cache client side changes. 
    (Chris Trezzo via kasha)

    YARN-2616 [YARN-913] Add CLI client to the registry to list, view
    and manipulate entries. (Akshay Radia via stevel)

    YARN-2994. Document work-preserving RM restart. (Jian He via ozawa)

    YARN-3249. Add a 'kill application' button to Resource Manager's Web UI.
    (Ryu Kobayashi via ozawa)

    YARN-2786. Created a yarn cluster CLI and seeded with one command for listing
    node-labels collection. (Wangda Tan via vinodkv)

  IMPROVEMENTS

    YARN-3005. [JDK7] Use switch statement for String instead of if-else
    statement in RegistrySecurity.java (Kengo Seki via aajisaka)

    YARN-2950. Change message to mandate, not suggest JS requirement on UI.
    (Dustin Cote via harsh)

    YARN-2891. Failed Container Executor does not provide a clear error
    message. (Dustin Cote via harsh)

    YARN-1979. TestDirectoryCollection fails when the umask is unusual.
    (Vinod Kumar Vavilapalli and Tsuyoshi OZAWA via junping_du)

    YARN-2641. Decommission nodes on -refreshNodes instead of next 
    NM-RM heartbeat. (Zhihai Xu via kasha)

    YARN-2742. FairSchedulerConfiguration should allow extra spaces
    between value and unit. (Wei Yan via kasha)

    YARN-2712. TestWorkPreservingRMRestart: Augment FS tests with
    queue and headroom checks. (Tsuyoshi Ozawa via kasha)

    YARN-2735. diskUtilizationPercentageCutoff and diskUtilizationSpaceCutoff 
    are initialized twice in DirectoryCollection. (Zhihai Xu via kasha)

    YARN-570. Time strings are formated in different timezone. 
    (Akira Ajisaka and Peng Zhang via kasha)

    YARN-2780. Log aggregated resource allocation in rm-appsummary.log (Eric
    Payne via jlowe)

    YARN-2690. [YARN-2574] Make ReservationSystem and its dependent classes 
    independent of Scheduler type. (Anubhav Dhoot via kasha)

    YARN-2157. Added YARN metrics in the documentaion. (Akira AJISAKA via
    jianhe)

    YARN-2802. ClusterMetrics to include AM launch and register delays.
    (Zhihai Xu via kasha)

    YARN-2375. Allow enabling/disabling timeline server per framework.
    (Mit Desai via jeagles)

    YARN-2604. Scheduler should consider max-allocation-* in conjunction
    with the largest node. (Robert Kanter via kasha)

    YARN-2679. Add metric for container launch duration. (Zhihai Xu via kasha)

    YARN-2669. FairScheduler: queue names shouldn't allow periods
    (Wei Yan via Sandy Ryza)

    YARN-2404. Removed ApplicationAttemptState and ApplicationState class in
    RMStateStore. (Tsuyoshi OZAWA via jianhe)

    YARN-2165. Added the sanity check for the numeric configuration values of
    the timeline service. (Vasanth kumar RJ via zjshen)

    YARN-2907. SchedulerNode#toString should print all resource detail instead 
    of only memory. (Rohith via junping_du)

    YARN-2136. Changed RMStateStore to ignore store opearations when fenced.
    (Varun Saxena via jianhe)

    YARN-1156. Enhance NodeManager AllocatedGB and AvailableGB metrics 
    for aggregation of decimal values. (Tsuyoshi OZAWA via junping_du)

    YARN-2301. Improved yarn container command. (Naganarasimha G R via jianhe)

    YARN-2056. Disable preemption at Queue level (Eric Payne via jlowe)

    YARN-2762. Fixed RMAdminCLI to trim and check node-label related arguments
    before sending to RM. (Rohith Sharmaks via jianhe)

    YARN-2972. DelegationTokenRenewer thread pool never expands. (Jason Lowe
    via junping_du)

    YARN-2949. Add documentation for CGroups (Varun Vasudev via junping_du)

    YARN-2970. NodeLabel operations in RMAdmin CLI get missing in help command.
    (Varun Saxena via junping_du)

    YARN-2837. Support TimeLine server to recover delegation token when
    restarting. (Zhijie Shen via jianhe)

    YARN-2993. Several fixes (missing acl check, error log msg ...) and some 
    refinement in AdminService. (Yi Liu via junping_du)

    YARN-2943. Added node-labels page on RM web UI. (Wangda Tan via jianhe)

    YARN-2998. Abstract out scheduler independent PlanFollower components. 
    (Anubhav Dhoot via kasha)

    YARN-2360. Fair Scheduler: Display dynamic fair share for queues on the 
    scheduler page. (Ashwin Shankar and Wei Yan via kasha)

    YARN-2880. Added a test to make sure node labels will be recovered
    if RM restart is enabled. (Rohith Sharmaks via jianhe)

    YARN-2996. Improved synchronization and I/O operations of FS- and Mem-
    RMStateStore. (Yi Liu via zjshen)

    YARN-2956. Added missing links in YARN documentation. (Masatake Iwasaki via
    jianhe)

    YARN-2957. Create unit test to automatically compare YarnConfiguration
    and yarn-default.xml. (rchiang via rkanter)

    YARN-2643. Don't create a new DominantResourceCalculator on every
    FairScheduler.allocate call. (kasha via rkanter)

    YARN-3019. Make work-preserving-recovery the default mechanism for RM 
    recovery. (Jian He via junping_du)

    YARN-2807. Option "--forceactive" not works as described in usage of
    "yarn rmadmin -transitionToActive". (Masatake Iwasaki via xgong)

    YARN-2984. Metrics for container's actual memory usage. (kasha)

    YARN-2800. Remove MemoryNodeLabelsStore and add a way to enable/disable
    node labels feature. (Wangda Tan via ozawa)

    YARN-3024. LocalizerRunner should give DIE action when all resources are
    localized. (Chengbing Liu via xgong)

    YARN-3092. Created a common ResourceUsage class to track labeled resource
    usages in Capacity Scheduler. (Wangda Tan via jianhe)

    YARN-3086. Make NodeManager memory configurable in MiniYARNCluster.
    (Robert Metzger via ozawa)

    YARN-2897. CrossOriginFilter needs more log statements (Mit Desai via
    jeagles)

    YARN-3028. Better syntax for replaceLabelsOnNode in RMAdmin CLI
    (Rohith Sharmaks via wangda)

    YARN-2932. Add entry for "preemptable" status (enabled/disabled) to 
    scheduler web UI and queue initialize/refresh logging. 
    (Eric Payne via wangda)

    YARN-3108. ApplicationHistoryServer doesn't process -D arguments (Chang Li
    via jeagles)

    YARN-2808. Made YARN CLI list attempt’s finished containers of a running
    application. (Naganarasimha G R via zjshen)

    YARN-3085. Application summary should include the application type (Rohith
    via jlowe)

    YARN-3022. Expose Container resource information from NodeManager for
    monitoring (adhoot via ranter)

    YARN-3098. Created common QueueCapacities class in Capacity Scheduler to
    track capacities-by-labels of queues. (Wangda Tan via jianhe)

    YARN-3075. NodeLabelsManager implementation to retrieve label to node 
    mapping (Varun Saxena via wangda)

    YARN-1393. SLS: Add how-to-use instructions. (Wei Yan via kasha)

    YARN-1723. AMRMClientAsync missing blacklist addition and removal
    functionality. (Bartosz Ługowski via sseth)

    YARN-3123. Made YARN CLI show a single completed container even if the app
    is running. (Naganarasimha G R via zjshen)

    YARN-1582. Capacity Scheduler: add a maximum-allocation-mb setting per
    queue (Thomas Graves via jlowe)

    YARN-1904. Ensure exceptions thrown in ClientRMService &
    ApplicationHistoryClientService are uniform when application-attempt is
    not found. (zjshen via acmurthy)

    YARN-3144. Configuration for making delegation token failures to timeline
    server not-fatal (Jonathan Eagles via jlowe)

    YARN-3155. Refactor the exception handling code for TimelineClientImpl's 
    retryOn method (Li Lu via wangda)

    YARN-3100. Made YARN authorization pluggable. (Jian He via zjshen)

    YARN-2683. [YARN-913] registry config options: document and move to
    core-default. (stevel)

    YARN-1237. Description for yarn.nodemanager.aux-services in 
    yarn-default.xml is misleading. (Brahma Reddy Battula via ozawa)

    YARN-3157. Refactor the exception handling in ConverterUtils#to*Id.
    (Bibin A Chundatt via ozawa)

    YARN-3147. Clean up RM web proxy code. (Steve Loughran via xgong)

    YARN-2079. Recover NonAggregatingLogHandler state upon nodemanager
    restart. (Jason Lowe via junping_du) 

    YARN-3124. Fixed CS LeafQueue/ParentQueue to use QueueCapacities to track
    capacities-by-label. (Wangda Tan via jianhe)

    YARN-3158. Correct log messages in ResourceTrackerService.
    (Varun Saxena via xgong)

    YARN-3179. Update use of Iterator to Iterable in RMAdminCLI and
    CommonNodeLabelsManager. (Ray Chiang via xgong)

    YARN-3182. Cleanup switch statement in ApplicationMasterLauncher#handle().
    (Ray Chiang via ozawa)

    YARN-3203. Correct a log message in AuxServices. (Brahma Reddy Battula 
    via ozawa)

    YARN-1299. Improve a log message in AppSchedulingInfo by adding application 
    id. (Ashutosh Jindal and Devaraj K via ozawa)

    YARN-1514. Utility to benchmark ZKRMStateStore#loadState for RM HA.
    (Tsuyoshi OZAWA via jianhe)

    YARN-3076. Add API/Implementation to YarnClient to retrieve label-to-node 
    mapping. (Varun Saxena via wangda)

    YARN-2799. Cleanup TestLogAggregationService based on the change in YARN-90.
    (Zhihai Xu via junping_du)

    YARN-3230. Clarify application states on the web UI. (Jian He via wangda)

    YARN-3237. AppLogAggregatorImpl fails to log error cause.
    (Rushabh S Shah via xgong)

    YARN-3236. Cleanup RMAuthenticationFilter#AUTH_HANDLER_PROPERTY.
    (zhihai xu via xgong)

    YARN-2797. TestWorkPreservingRMRestart should use ParametrizedSchedulerTestBase
    (Karthik Kambatla via xgong)

    YARN-2797. Add -help to yarn logs and nodes CLI command. 
    (Jagadesh Kiran N via devaraj)

    YARN-3217. Remove httpclient dependency from hadoop-yarn-server-web-proxy.
    (Brahma Reddy Battula via ozawa).

    YARN-3255. RM, NM, JobHistoryServer, and WebAppProxyServer's main()
    should support generic options. (shv)

    YARN-2820. Retry in FileSystemRMStateStore when FS's operations fail 
    due to IOException. (Zhihai Xu via ozawa)

    YARN-3262. Surface application outstanding resource requests table 
    in RM web UI. (Jian He via wangda)

    YARN-3281. Added RMStateStore to StateMachine visualization list.
    (Chengbing Liu via jianhe)

    YARN-3272. Surface container locality info in RM web UI.
    (Jian He via wangda)

    YARN-3122. Metrics for container's actual CPU usage. 
    (Anubhav Dhoot via kasha)

    YARN-1809. Synchronize RM and TimeLineServer Web-UIs. (Zhijie Shen and
    Xuan Gong via jianhe)

    YARN-2190. Added CPU and memory limit options to the default container
    executor for Windows containers. (Chuan Liu via jianhe)

    YARN-3296. Mark ResourceCalculatorProcessTree class as Public for configurable
    resource monitoring. (Hitesh Shah via junping_du)

    YARN-3187. Documentation of Capacity Scheduler Queue mapping based on user
    or group. (Gururaj Shetty via jianhe)

    YARN-2854. Updated the documentation of the timeline service and the generic
    history service. (Naganarasimha G R via zjshen)

    YARN-2777. Mark the end of individual log in aggregated log.
    (Varun Saxena via xgong)

  OPTIMIZATIONS

    YARN-2990. FairScheduler's delay-scheduling always waits for node-local and 
    rack-local delays, even for off-rack-only requests. (kasha)

  BUG FIXES

    YARN-3071. Remove invalid char from sample conf in doc of FairScheduler.
    (Masatake Iwasaki via aajisaka)

    YARN-2254. TestRMWebServicesAppsModification should run against both 
    CS and FS. (Zhihai Xu via kasha)

    YARN-2713. "RM Home" link in NM should point to one of the RMs in an 
    HA setup. (kasha)

    YARN-2766. Made ApplicationHistoryManager return a sorted list of apps,
    attempts and containers. (Robert Kanter via zjshen)

    YARN-2856. Fixed RMAppImpl to handle ATTEMPT_KILLED event at ACCEPTED state
    on app recovery. (Rohith Sharmaks via jianhe)

    YARN-2857. ConcurrentModificationException in ContainerLogAppender
    (Mohammad Kamrul Islam via jlowe)

    YARN-2816. NM fail to start with NPE during container recovery (Zhihai Xu
    via jlowe)

    YARN-2432. RMStateStore should process the pending events before close.
    (Varun Saxena via jianhe)

    YARN-1703. Fixed ResourceManager web-proxy to close connections correctly.
    (Rohith Sharma via vinodkv)

    YARN-2414. RM web UI: app page will crash if app is failed before any
    attempt has been created (Wangda Tan via jlowe)

    YARN-2870. Updated the command to run the timeline server in the document.
    (Masatake Iwasaki via zjshen)

    YARN-2878. Fix DockerContainerExecutor.apt.vm formatting. (Abin Shahab via
    jianhe)

    YARN-2865. Fixed RM to always create a new RMContext when transtions from
    StandBy to Active. (Rohith Sharmaks via jianhe)

    YARN-2315. FairScheduler: Set current capacity in addition to capacity.
    (Zhihai Xu via kasha)

    YARN-1984. LeveldbTimelineStore does not handle db exceptions properly
    (Varun Saxena via jlowe)

    YARN-2697. Remove useless RMAuthenticationHandler. (Haosong Huang via zjshen)

    YARN-2906. CapacitySchedulerPage shows HTML tags for a queue's Active Users.
    (Jason Lowe via jianhe)

    YARN-2905. AggregatedLogsBlock page can infinitely loop if the aggregated
    log file is corrupted (Varun Saxena via jlowe)

    YARN-2894. Fixed a bug regarding application view acl when RM fails over.
    (Rohith Sharmaks via jianhe)

    YARN-2874. Dead lock in "DelegationTokenRenewer" which blocks RM to execute
    any further apps. (Naganarasimha G R via kasha)

    YARN-2461. Fix PROCFS_USE_SMAPS_BASED_RSS_ENABLED property in
    YarnConfiguration. (rchiang via rkanter)

    YARN-2869. CapacityScheduler should trim sub queue names when parse
    configuration. (Wangda Tan via jianhe)

    YARN-2927. [YARN-1492] InMemorySCMStore properties are inconsistent. 
    (Ray Chiang via kasha)

    YARN-2931. PublicLocalizer may fail until directory is initialized by
    LocalizeRunner. (Anubhav Dhoot via kasha)

    YARN-2910. FSLeafQueue can throw ConcurrentModificationException. 
    (Wilfred Spiegelenburg via kasha)

    YARN-2930. Fixed TestRMRestart#testRMRestartRecoveringNodeLabelManager
    intermittent failure. (Wangda Tan via jianhe)

    YARN-2924. Fixed RMAdminCLI to not convert node labels to lower case.
    (Wangda Tan via jianhe)

    YARN-2917. Fixed potential deadlock when system.exit is called in AsyncDispatcher
    (Rohith Sharmaks via jianhe)

    YARN-2243. Order of arguments for Preconditions.checkNotNull() is wrong in 
    SchedulerApplicationAttempt ctor. (devaraj)

    YARN-2912 Jersey Tests failing with port in use. (varun saxena via stevel)

    YARN-2356. yarn status command for non-existent application/application 
    attempt/container is too verbose. (Sunil G via devaraj)

    YARN-2914. [YARN-1492] Potential race condition in Singleton implementation of 
    SharedCacheUploaderMetrics, CleanerMetrics, ClientSCMMetrics. (Varun Saxena via kasha)

    YARN-2964. FSLeafQueue#assignContainer - document the reason for using both write and
    read locks. (Tsuyoshi Ozawa via kasha)

    YARN-2944. InMemorySCMStore can not be instantiated with ReflectionUtils#newInstance.
    (Chris Trezzo via kasha)

    YARN-2964. RM prematurely cancels tokens for jobs that submit jobs (oozie)
    (Jian He via jlowe)

    YARN-2675. containersKilled metrics is not updated when the container is killed 
    during localization. (Zhihai Xu via kasha)

    YARN-2952. Fixed incorrect version check in StateStore. (Rohith Sharmaks
    via jianhe)

    YARN-2975. FSLeafQueue app lists are accessed without required locks. (kasha)

    YARN-2977. Fixed intermittent TestNMClient failure.
    (Junping Du via ozawa)

    YARN-2939. Fix new findbugs warnings in hadoop-yarn-common. (Li Lu via junping_du)

    YARN-2920. Changed CapacityScheduler to kill containers on nodes where
    node labels are changed. (Wangda Tan via jianhe)

    YARN-2340. Fixed NPE when queue is stopped during RM restart.
    (Rohith Sharmaks via jianhe)

    YARN-2940. Fix new findbugs warnings in rest of the hadoop-yarn components. (Li Lu 
    via junping_du)

    YARN-2937. Fixed new findbugs warnings in hadoop-yarn-nodemanager. (Varun Saxena
    via zjshen)

    YARN-2946. Fixed potential deadlock in RMStateStore. (Rohith Sharmaks via
    jianhe)

    YARN-2988. Graph#save() may leak file descriptors. (Ted Yu via ozawa)

    YARN-2992. ZKRMStateStore crashes due to session expiry. (Karthik Kambatla
    via jianhe)

    YARN-2938. Fixed new findbugs warnings in hadoop-yarn-resourcemanager and
    hadoop-yarn-applicationhistoryservice. (Varun Saxena via zjshen)

    YARN-2987. Fixed ClientRMService#getQueueInfo to check against queue and
    app ACLs. (Varun Saxena via jianhe)

    YARN-2991. Fixed DrainDispatcher to reuse the draining code path in
    AsyncDispatcher. (Rohith Sharmaks via zjshen)

    YARN-2922. ConcurrentModificationException in CapacityScheduler's LeafQueue.
    (Rohith Sharmaks via ozawa)

    YARN-2958. Made RMStateStore not update the last sequence number when updating the
    delegation token. (Varun Saxena via zjshen)

    YARN-2978. Fixed potential NPE while getting queue info. (Varun Saxena via
    jianhe)

    YARN-2230. Fixed few configs description in yarn-default.xml. (Vijay Bhat
    via jianhe)

    YARN-3010. Fixed findbugs warning in AbstractYarnScheduler. (Yi Liu via
    jianhe)

    YARN-2936. Changed YARNDelegationTokenIdentifier to set proto fields on
    getProto method. (Varun Saxena via jianhe)

    YARN-2997. Fixed NodeStatusUpdater to not send alreay-sent completed
    container statuses on heartbeat. (Chengbing Liu via jianhe)

    YARN-3014. Replaces labels on a host should update all NM's labels on that
    host. (Wangda Tan via jianhe)

    YARN-3027. Scheduler should use totalAvailable resource from node instead of
    availableResource for maxAllocation. (adhoot via rkanter)

    YARN-2637. Fixed max-am-resource-percent calculation in CapacityScheduler
    when activating applications. (Craig Welch via jianhe)

    YARN-2861. Fixed Timeline DT secret manager to not reuse RM's configs.
    (Zhijie Shen via jianhe)

    YARN-3064. TestRMRestart/TestContainerResourceUsage/TestNodeManagerResync 
    failure with allocation timeout. (Jian He via junping_du)

    YARN-2815. Excluded transitive dependency of JLine in hadoop-yarn-server-common.
    (Ferdinand Xu via zjshen)

    YARN-3070. TestRMAdminCLI#testHelp fails for transitionToActive command. 
    (Contributed by Junping Du)

    YARN-3015. yarn classpath command should support same options as hadoop
    classpath. (Contributed by Varun Saxena)

    YARN-2933. Capacity Scheduler preemption policy should only consider capacity 
    without labels temporarily. (Mayank Bansal via wangda)

    YARN-2731. Fixed RegisterApplicationMasterResponsePBImpl to properly invoke 
    maybeInitBuilder. (Carlo Curino via wangda)

    YARN-3078. LogCLIHelpers lacks of a blank space before string 'does not exist'.
    (Sam Liu via ozawa)

    YARN-3082. Non thread safe access to systemCredentials in NodeHeartbeatResponse
    processing. (Anubhav Dhoot via ozawa)

    YARN-3088. LinuxContainerExecutor.deleteAsUser can throw NPE if native
    executor returns an error (Eric Payne via jlowe)

    YARN-3011. Possible IllegalArgumentException in ResourceLocalizationService
    might lead NM to crash. (Varun Saxena via jianhe)

    YARN-3103. AMRMClientImpl does not update AMRM token properly. (Jason Lowe
    via jianhe)

    YARN-3079. Scheduler should also update maximumAllocation when updateNodeResource.
    (Zhihai Xu via wangda)

    YARN-3029. FSDownload.unpack() uses local locale for FS case conversion, may not
    work everywhere. (Varun Saxena via ozawa)

    YARN-3099. Capacity Scheduler LeafQueue/ParentQueue should use ResourceUsage
    to track used-resources-by-label.(Wangda Tan via jianhe)

    YARN-3077. Fixed RM to create zk root path recursively. (Chun Chen via jianhe)

    YARN-3113. Release audit warning for Sorting icons.psd. (stevel via kihwal)

    YARN-3056. Add verification for containerLaunchDuration
    in TestNodeManagerMetrics. (zhihai xu via xgong)

    YARN-2543. Made resource usage be published to the timeline server too.
    (Naganarasimha G R via zjshen)

    YARN-3058. Fix error message of tokens' activation delay configuration.
    (Yi Liu via ozawa)

    YARN-3101. In Fair Scheduler, fix canceling of reservations for exceeding
    max share (Anubhav Dhoot via Sandy Ryza)

    YARN-3149. Fix typo in message for invalid application id.
    (Bibin A Chundatt via xgong)

    YARN-3145. Fixed ConcurrentModificationException on CapacityScheduler
    ParentQueue#getQueueUserAclInfo. (Tsuyoshi OZAWA via jianhe)

    YARN-1537. Fix race condition in
    TestLocalResourcesTrackerImpl.testLocalResourceCache. (xgong via acmurthy)

    YARN-2694. Ensure only single node label specified in ResourceRequest.
    (Wangda Tan via jianhe)

    YARN-3089. LinuxContainerExecutor does not handle file arguments to
    deleteAsUser (Eric Payne via jlowe)

    YARN-3143. RM Apps REST API can return NPE or entries missing id and other
    fields (jlowe)

    YARN-3094. Reset timer for liveness monitors after RM recovery. (Jun Gong
    via jianhe)

    YARN-2971. RM uses conf instead of token service address to renew timeline
    delegation tokens (jeagles)

    YARN-3090. DeletionService can silently ignore deletion task failures
    (Varun Saxena via jlowe)

    YARN-2809. Implement workaround for linux kernel panic when removing
    cgroup (Nathan Roberts via jlowe)

    YARN-2246. Made the proxy tracking URL always be
    http(s)://proxy addr:port/proxy/<appId> to avoid duplicate sections. (Devaraj
    K via zjshen)

    YARN-3160. Fix non-atomic operation on nodeUpdateQueue in RMNodeImpl. 
    (Chengbing Liu via junping_du)

    YARN-3074. Nodemanager dies when localizer runner tries to write to a full
    disk (Varun Saxena via jlowe)

    YARN-3151. On Failover tracking url wrong in application cli for
    KILLED application (Rohith via xgong)

    YARN-1580. Documentation error regarding "container-allocation.expiry-interval-ms" 
    (Brahma Reddy Battula via junping_du)

    YARN-3104. Fixed RM to not generate new AMRM tokens on every heartbeat
    between rolling and activation. (Jason Lowe via jianhe)

    YARN-3191. Log object should be initialized with its own class. (Rohith via
    aajisaka)

    YARN-3164. RMAdmin command usage prints incorrect command name. 
    (Bibin A Chundatt via xgong)

    YARN-2847. Linux native container executor segfaults if default banned
    user detected (Olaf Flebbe via jlowe)

    YARN-2899. Run TestDockerContainerExecutorWithMocks on Linux only.
    (Ming Ma via cnauroth)

    YARN-2749. Fix some testcases from TestLogAggregationService fails in trunk. 
    (Xuan Gong via junping_du)

    YARN-3207. Secondary filter matches entites which do not have the key being
    filtered for. (Zhijie Shen via xgong)

    YARN-3132. RMNodeLabelsManager should remove node from node-to-label mapping
    when node becomes deactivated. (Wangda Tan via jianhe)

    YARN-1615. Fix typos in description about delay scheduling. (Akira Ajisaka via 
    ozawa)

    YARN-933. Fixed InvalidStateTransitonException at FINAL_SAVING state in
    RMApp. (Rohith Sharmaks via jianhe)

    YARN-3194. RM should handle NMContainerStatuses sent by NM while
    registering if NM is Reconnected node (Rohith via jlowe)

    YARN-3238. Connection timeouts to nodemanagers are retried at
    multiple levels (Jason Lowe via xgong)

    YARN-3247. TestQueueMappings should use CapacityScheduler explicitly.
    (Zhihai Xu via ozawa)

    YARN-3239. WebAppProxy does not support a final tracking url which has
    query fragments and params (Jian He via jlowe)

    YARN-3256. TestClientToAMTokens#testClientTokenRace is not running against 
    all Schedulers even when using ParameterizedSchedulerTestBase. 
    (Anubhav Dhoot via devaraj)

    YARN-3270. Fix node label expression not getting set in 
    ApplicationSubmissionContext (Rohit Agarwal via wangda)

    YARN-3265. Fixed a deadlock in CapacityScheduler by always passing a queue's
    available resource-limit from the parent queue. (Wangda Tan via vinodkv)

    YARN-3131. YarnClientImpl should check FAILED and KILLED state in
    submitApplication (Chang Li via jlowe)
    
    YARN-3231. FairScheduler: Changing queueMaxRunningApps interferes with pending 
    jobs. (Siqi Li via kasha)

    YARN-3242. Asynchrony in ZK-close can lead to ZKRMStateStore watcher receiving 
    events for old client. (Zhihai Xu via kasha)

    YARN-3227. Timeline renew delegation token fails when RM user's TGT is expired
    (Zhijie Shen via xgong)

    YARN-3275. CapacityScheduler: Preemption happening on non-preemptable
    queues (Eric Payne via jlowe)

    YARN-3287. Made TimelineClient put methods do as the correct login context.
    (Daryn Sharp and Jonathan Eagles via zjshen)

    YARN-3300. Outstanding_resource_requests table should not be shown in AHS.
    (Xuan Gong via jianhe)

    YARN-3295. Fix documentation nits found in markdown conversion.
    (Masatake Iwasaki via ozawa)

    YARN-1884. Added nodeHttpAddress into ContainerReport and fixed the link to NM
    web page. (Xuan Gong via zjshen)

    YARN-3338. Exclude jline dependency from YARN. (Zhijie Shen via xgong)

    YARN-3154. Added additional APIs in LogAggregationContext to avoid aggregating
    running logs of application when rolling is enabled. (Xuan Gong via vinodkv)

    YARN-3267. Timelineserver applies the ACL rules after applying the limit on
    the number of records (Chang Li via jeagles)

    YARN-3171. Sort by Application id, AppAttempt and ContainerID doesn't work
    in ATS / RM web ui. (Naganarasimha G R via xgong)

    YARN-1453. [JDK8] Fix Javadoc errors caused by incorrect or illegal tags in 
    doc comments. (Akira AJISAKA, Andrew Purtell, and Allen Wittenauer via ozawa)

    YARN-3349. Treat all exceptions as failure in
    TestFSRMStateStore#testFSRMStateStoreClientRetry. (Zhihai Xu via ozawa)

    YARN-3379. Fixed missing data in localityTable and ResourceRequests table
    in RM WebUI. (Xuan Gong via jianhe)

    YARN-3369. Missing NullPointer check in AppSchedulingInfo causes RM to die.
    (Brahma Reddy Battula via wangda)

    YARN-3384. TestLogAggregationService.verifyContainerLogs fails after
    YARN-2777. (Naganarasimha G R via ozawa)

    YARN-3336. FileSystem memory leak in DelegationTokenRenewer.
    (Zhihai Xu via cnauroth)

    YARN-3393. Getting application(s) goes wrong when app finishes before
    starting the attempt. (Zhijie Shen via xgong)

Release 2.6.0 - 2014-11-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-1964. Create Docker analog of the LinuxContainerExecutor in YARN. (Abin 
    Shahab via raviprak)

    YARN-2131. Add a way to format the RMStateStore. (Robert Kanter via kasha)

    YARN-1367. Changed NM to not kill containers on NM resync if RM work-preserving
    restart is enabled. (Anubhav Dhoot via jianhe)

    YARN-1366. Changed AMRMClient to re-register with RM and send outstanding requests
    back to RM on work-preserving RM restart. (Rohith via jianhe)

    YARN-2181. Added preemption info to logs and RM web UI. (Wangda Tan via
    jianhe)

    YARN-1354. Recover applications upon nodemanager restart. (Jason Lowe via 
    junping_du)

    YARN-1337. Recover containers upon nodemanager restart. (Jason Lowe via 
    junping_du)

    YARN-2277. Added cross-origin support for the timeline server web services.
    (Jonathan Eagles via zjshen)

    YARN-2378. Added support for moving applications across queues in
    CapacityScheduler. (Subramaniam Venkatraman Krishnan via jianhe)

    YARN-2411. Support simple user and group mappings to queues. (Ram Venkatesh
    via jianhe)

    YARN-2174. Enable HTTPs for the writer REST API of TimelineServer.
    (Zhijie Shen via jianhe)

    YARN-2393. FairScheduler: Add the notion of steady fair share. 
    (Wei Yan via kasha)

    YARN-2395. FairScheduler: Preemption timeout should be configurable per 
    queue. (Wei Yan via kasha)

    YARN-2394. FairScheduler: Configure fairSharePreemptionThreshold per queue.
    (Wei Yan via kasha)

    YARN-415. Capture aggregate memory allocation at the app-level for chargeback.
    (Eric Payne & Andrey Klochkov via jianhe)

    YARN-2440. Enabled Nodemanagers to limit the aggregate cpu usage across all
    containers to a preconfigured limit. (Varun Vasudev via vinodkv)

    YARN-2033. Merging generic-history into the Timeline Store 
    (Zhijie Shen via junping_du)

    YARN-611. Added an API to let apps specify an interval beyond which AM
    failures should be ignored towards counting max-attempts. (Xuan Gong via
    vinodkv)

    YARN-2531. Added a configuration for admins to be able to override app-configs
    and enforce/not-enforce strict control of per-container cpu usage. (Varun
    Vasudev via vinodkv)

    YARN-1250. Generic history service should support application-acls. (Zhijie Shen
    via junping_du)

    YARN-2569. Added the log handling APIs for the long running services. (Xuan
    Gong via zjshen)

    YARN-2102. Added the concept of a Timeline Domain to handle read/write ACLs
    on Timeline service event data. (Zhijie Shen via vinodkv)

    YARN-2581. Passed LogAggregationContext to NM via ContainerTokenIdentifier.
    (Xuan Gong via zjshen)

    YARN-1063. Augmented Hadoop common winutils to have the ability to create
    containers as domain users. (Remus Rusanu via vinodkv)

    YARN-1972. Added a secure container-executor for Windows. (Remus Rusanu via
    vinodkv)

    YARN-2613. Support retry in NMClient for rolling-upgrades. (Jian He via 
    junping_du)

    YARN-2446. Augmented Timeline service APIs to start taking in domains as a
    parameter while posting entities and events. (Zhijie Shen via vinodkv)

    YARN-2468. Enhanced NodeManager to support log handling APIs (YARN-2569) for
    use by long running services. (Xuan Gong via vinodkv)

    YARN-1051. Add a system for creating reservations of cluster capacity.
    (see breakdown below)

    YARN-913. Add a way to register long-lived services in a YARN cluster.
    (stevel)

    YARN-2493. Added user-APIs for using node-labels. (Wangda Tan via vinodkv)

    YARN-2544. Added admin-API objects for using node-labels. (Wangda Tan via
    vinodkv)

    YARN-2494. Added NodeLabels Manager internal API and implementation. (Wangda
    Tan via vinodkv)

    YARN-2501. Enhanced AMRMClient library to support requests against node
    labels. (Wangda Tan via vinodkv)

    YARN-2656. Made RM web services authentication filter support proxy user.
    (Varun Vasudev and Zhijie Shen via zjshen)

    YARN-2496. Enhanced Capacity Scheduler to have basic support for allocating
    resources based on node-labels. (Wangda Tan via vinodkv)

    YARN-2500. Enhaced ResourceManager to support schedulers allocating resources
    based on node-labels. (Wangda Tan via vinodkv)

    YARN-2504. Enhanced RM Admin CLI to support management of node-labels.
    (Wangda Tan via vinodkv)

    YARN-2198. Remove the need to run NodeManager as privileged account for
    Windows Secure Container Executor. (Remus Rusanu via jianhe)

    YARN-2647. Added a queue CLI for getting queue information. (Sunil Govind via
    vinodkv)

    YARN-2632. Document NM Restart feature. (Junping Du and Vinod Kumar
    Vavilapalli via jlowe)

    YARN-2505. Supported get/add/remove/change labels in RM REST API. (Craig Welch
    via zjshen)

    YARN-2811. In Fair Scheduler, reservation fulfillments shouldn't ignore max
    share (Siqi Li via Sandy Ryza)

  IMPROVEMENTS

    YARN-2197. Add a link to YARN CHANGES.txt in the left side of doc
      (Akira AJISAKA via aw)

    YARN-1918. Typo in description and error message for
      'yarn.resourcemanager.cluster-id' (Anandha L Ranganathan via aw)

    YARN-2242. Improve exception information on AM launch crashes. (Li Lu 
    via junping_du)

    YARN-2274. FairScheduler: Add debug information about cluster capacity, 
    availability and reservations. (kasha)

    YARN-2228. Augmented TimelineServer to load pseudo authentication filter when
    authentication = simple. (Zhijie Shen via vinodkv)

    YARN-1341. Recover NMTokens upon nodemanager restart. (Jason Lowe via 
    junping_du)

    YARN-2208. AMRMTokenManager need to have a way to roll over AMRMToken. (xgong)

    YARN-2323. FairShareComparator creates too many Resource objects (Hong Zhiguo
    via Sandy Ryza)

    YARN-2045. Data persisted in NM should be versioned (Junping Du via jlowe)

    YARN-2013. The diagnostics is always the ExitCodeException stack when the container 
    crashes. (Tsuyoshi OZAWA via junping_du)

    YARN-2295. Refactored DistributedShell to use public APIs of protocol records.
    (Li Lu via jianhe)

    YARN-1342. Recover container tokens upon nodemanager restart. (Jason Lowe via
    devaraj)

    YARN-2214. FairScheduler: preemptContainerPreCheck() in FSParentQueue delays 
    convergence towards fairness. (Ashwin Shankar via kasha)

    YARN-2211. Persist AMRMToken master key in RMStateStore for RM recovery.
    (Xuan Gong via jianhe)

    YARN-2328. FairScheduler: Verify update and continuous scheduling threads are
    stopped when the scheduler is stopped. (kasha)

    YARN-2347. Consolidated RMStateVersion and NMDBSchemaVersion into Version in
    yarn-server-common. (Junping Du via zjshen)

    YARN-1994. Expose YARN/MR endpoints on multiple interfaces. (Craig Welch,
    Milan Potocnik, Arpit Agarwal via xgong)

    YARN-2343. Improve NMToken expire exception message. (Li Lu via jianhe)

    YARN-2370. Fix comment in o.a.h.y.server.resourcemanager.schedulerAppSchedulingInfo 
    (Wenwu Peng via junping_du)

    YARN-2298. Move TimelineClient to yarn-common project (Zhijie Shen via 
    junping_du)

    YARN-2288. Made persisted data in LevelDB timeline store be versioned. (Junping Du
    via zjshen)

    YARN-2352. FairScheduler: Collect metrics on duration of critical methods that 
    affect performance. (kasha)

    YARN-2212. ApplicationMaster needs to find a way to update the AMRMToken
    periodically. (xgong)

    YARN-2026. Fair scheduler: Consider only active queues for computing fairshare. 
    (Ashwin Shankar via kasha)

    YARN-1954. Added waitFor to AMRMClient(Async). (Tsuyoshi Ozawa via zjshen)

    YARN-2302. Refactor TimelineWebServices. (Zhijie Shen via junping_du)

    YARN-2337. ResourceManager sets ClientRMService in RMContext multiple times.
    (Zhihai Xu via kasha)

    YARN-2138. Cleaned up notifyDone* APIs in RMStateStore. (Varun Saxena via
    jianhe)

    YARN-2373. Changed WebAppUtils to use Configuration#getPassword for
    accessing SSL passwords. (Larry McCay via jianhe)

    YARN-2317. Updated the document about how to write YARN applications. (Li Lu via
    zjshen)

    YARN-2399. FairScheduler: Merge AppSchedulable and FSSchedulerApp into 
    FSAppAttempt. (kasha)

    YARN-1370. Fair scheduler to re-populate container allocation state. 
    (Anubhav Dhoot via kasha)

    YARN-2389. Added functionality for schedulers to kill all applications in a
    queue. (Subramaniam Venkatraman Krishnan via jianhe)

    YARN-1326. RM should log using RMStore at startup time. 
    (Tsuyoshi Ozawa via kasha)

    YARN-2182. Updated ContainerId#toString() to append RM Epoch number.
    (Tsuyoshi OZAWA via jianhe)

    YARN-2406. Move RM recovery related proto to
    yarn_server_resourcemanager_recovery.proto. (Tsuyoshi Ozawa via jianhe)

    YARN-1506. Changed RMNode/SchedulerNode to update resource with event
    notification. (Junping Du via jianhe)

    YARN-2509. Enable Cross Origin Filter for timeline server only and not all
    Yarn servers (Mit Desai via jeagles)

    YARN-2511. Allowed all origins by default when CrossOriginFilter is
    enabled. (Jonathan Eagles via zjshen)

    YARN-2508. Cross Origin configuration parameters prefix are not honored
    (Mit Desai via jeagles)

    YARN-2512. Allowed pattern matching for origins in CrossOriginFilter.
    (Jonathan Eagles via zjshen)

    YARN-2507. Documented CrossOriginFilter configurations for the timeline
    server. (Jonathan Eagles via zjshen)

    YARN-2515. Updated ConverterUtils#toContainerId to parse epoch.
    (Tsuyoshi OZAWA via jianhe)

    YARN-2448. Changed ApplicationMasterProtocol to expose RM-recognized resource
    types to the AMs. (Varun Vasudev via vinodkv)

    YARN-2538. Added logs when RM sends roll-overed AMRMToken to AM. (Xuan Gong
    via zjshen)

    YARN-2229. Changed the integer field of ContainerId to be long type.
    (Tsuyoshi OZAWA via jianhe)

    YARN-2547. Cross Origin Filter throws UnsupportedOperationException upon
    destroy (Mit Desai via jeagles)

    YARN-2557. Add a parameter "attempt_Failures_Validity_Interval" into
    DistributedShell (xgong)

    YARN-2001. Added a time threshold for RM to wait before starting container
    allocations after restart/failover. (Jian He via vinodkv)

    YARN-1372. Ensure all completed containers are reported to the AMs across
    RM restart. (Anubhav Dhoot via jianhe)

    YARN-2539. FairScheduler: Set the default value for maxAMShare to 0.5. 
    (Wei Yan via kasha)

    YARN-1959. Fix headroom calculation in FairScheduler. 
    (Anubhav Dhoot via kasha)

    YARN-2577. Clarify ACL delimiter and how to configure ACL groups only
    (Miklos Christine via aw)

    YARN-2372. There are Chinese Characters in the FairScheduler's document
    (Fengdong Yu via aw)

    YARN-668. Changed NMTokenIdentifier/AMRMTokenIdentifier/ContainerTokenIdentifier
    to use protobuf object as the payload. (Junping Du via jianhe)

    YARN-1769. CapacityScheduler: Improve reservations (Thomas Graves via
    jlowe)

    YARN-2627. Added the info logs of attemptFailuresValidityInterval and number
    of previous failed attempts. (Xuan Gong via zjshen)

    YARN-2562. Changed ContainerId#toString() to be more readable. (Tsuyoshi
    OZAWA via jianhe)

    YARN-2615. Changed ClientToAMTokenIdentifier/RM(Timeline)DelegationTokenIdentifier
    to use protobuf as payload. (Junping Du via jianhe)

    YARN-2629. Made the distributed shell use the domain-based timeline ACLs.
    (zjshen)

    YARN-2583. Modified AggregatedLogDeletionService to be able to delete rolling
    aggregated logs. (Xuan Gong via zjshen)

    YARN-2312. Deprecated old ContainerId#getId API and updated MapReduce to
    use ContainerId#getContainerId instead. (Tsuyoshi OZAWA via jianhe)

    YARN-2621. Simplify the output when the user doesn't have the access for
    getDomain(s). (Zhijie Shen via jianhe)

    YARN-1879. Marked Idempotent/AtMostOnce annotations to ApplicationMasterProtocol
    for RM fail over. (Tsuyoshi OZAWA via jianhe)

    YARN-2676. Enhanced Timeline auth-filter to support proxy users. (Zhijie Shen
    via vinodkv)

    YARN-2673. Made timeline client put APIs retry if ConnectException happens.
    (Li Lu via zjshen)

    YARN-2582. Fixed Log CLI and Web UI for showing aggregated logs of LRS. (Xuan
    Gong via zjshen)

    YARN-90. NodeManager should identify failed disks becoming good again
    (Varun Vasudev via jlowe)

    YARN-2709. Made timeline client getDelegationToken API retry if ConnectException
    happens. (Li Lu via zjshen)

    YARN-2682. Updated WindowsSecureContainerExecutor to not use
    DefaultContainerExecutor#getFirstApplicationDir and use getWorkingDir()
    instead. (Zhihai Xu via jianhe)

    YARN-2209. Replaced AM resync/shutdown command with corresponding exceptions and
    made related MR changes. (Jian He via zjshen)

    YARN-2703. Added logUploadedTime into LogValue for better display. (Xuan Gong
    via zjshen)

    YARN-2704. Changed ResourceManager to optionally obtain tokens itself for the
    sake of localization and log-aggregation for long-running services. (Jian He
    via vinodkv)

    YARN-2502. Changed DistributedShell to support node labels. (Wangda Tan via
    jianhe)

    YARN-2760. Remove 'experimental' from FairScheduler docs. (Harsh J via kasha)

    YARN-2503. Added node lablels in web UI. (Wangda Tan via jianhe)

    YARN-2779. Fixed ResourceManager to not require delegation tokens for 
    communicating with Timeline Service. (Zhijie Shen via vinodkv)

    YARN-2778. Moved node-lables' reports to the yarn nodes CLI from the admin
    CLI. (Wangda Tan via vinodkv)

    YARN-2770. Added functionality to renew/cancel TimeLineDelegationToken.
    (Zhijie Shen via jianhe)

    YARN-2818. Removed the now unnecessary user entity injection from Timeline
    service given we now have domains. (Zhijie Shen via vinodkv)

    YARN-2635. TestRM, TestRMRestart, TestClientToAMTokens should run 
    with both CS and FS. (Wei Yan and kasha via kasha)

  OPTIMIZATIONS

  BUG FIXES

    YARN-2251. Avoid negative elapsed time in JHS/MRAM web UI and services.
    (Zhijie Shen via junping_du)

    YARN-2088. Fixed a bug in GetApplicationsRequestPBImpl#mergeLocalToBuilder.
    (Binglin Chang via jianhe)

    YARN-2260. Fixed ResourceManager's RMNode to correctly remember containers
    when nodes resync during work-preserving RM restart. (Jian He via vinodkv)

    YARN-2264. Fixed a race condition in DrainDispatcher which may cause random
    test failures. (Li Lu via jianhe)

    YARN-2219. Changed ResourceManager to avoid AMs and NMs getting exceptions
    after RM recovery but before scheduler learns about apps and app-attempts.
    (Jian He via vinodkv)

    YARN-2244. FairScheduler missing handling of containers for unknown 
    application attempts. (Anubhav Dhoot via kasha)

    YARN-2321. NodeManager web UI can incorrectly report Pmem enforcement
    (Leitao Guo via jlowe)

    YARN-2273. NPE in ContinuousScheduling thread when we lose a node. 
    (Wei Yan via kasha)

    YARN-2313. Livelock can occur in FairScheduler when there are lots of
    running apps (Tsuyoshi Ozawa via Sandy Ryza)

    YARN-2147. client lacks delegation token exception details when
    application submit fails (Chen He via jlowe)

    YARN-1796. container-executor shouldn't require o-r permissions (atm)

    YARN-2354. DistributedShell may allocate more containers than client
    specified after AM restarts. (Li Lu via jianhe)

    YARN-2051. Fix bug in PBimpls and add more unit tests with reflection. 
    (Binglin Chang via junping_du)

    YARN-2374. Fixed TestDistributedShell#testDSShell failure due to hostname
    dismatch. (Varun Vasudev via jianhe)

    YARN-2359. Application hangs when it fails to launch AM container. 
    (Zhihai Xu via kasha)

    YARN-2388. Fixed TestTimelineWebServices failure due to HADOOP-10791. (zjshen)

    YARN-2008. Fixed CapacityScheduler to calculate headroom based on max available
    capacity instead of configured max capacity. (Craig Welch via jianhe)

    YARN-2400. Fixed TestAMRestart fails intermittently. (Jian He via xgong)

    YARN-2361. RMAppAttempt state machine entries for KILLED state has duplicate
    event entries. (Zhihai Xu via kasha)

    YARN-2070. Made DistributedShell publish the short user name to the timeline
    server. (Robert Kanter via zjshen)

    YARN-2397. Avoided loading two authentication filters for RM and TS web
    interfaces. (Varun Vasudev via zjshen)

    YARN-2409. RM ActiveToStandBy transition missing stoping previous rmDispatcher.
    (Rohith via jianhe)

    YARN-2249. Avoided AM release requests being lost on work preserving RM
    restart. (Jian He via zjshen)

    YARN-2034. Description for yarn.nodemanager.localizer.cache.target-size-mb
    is incorrect (Chen He via jlowe)

    YARN-1919. Potential NPE in EmbeddedElectorService#stop. 
    (Tsuyoshi Ozawa via kasha)

    YARN-2424. LCE should support non-cgroups, non-secure mode (Chris Douglas 
    via aw)

    YARN-2434. RM should not recover containers from previously failed attempt
    when AM restart is not enabled (Jian He via jlowe)

    YARN-2035. FileSystemApplicationHistoryStore should not make working dir
    when it already exists. (Jonathan Eagles via zjshen)

    YARN-2405. NPE in FairSchedulerAppsBlock. (Tsuyoshi Ozawa via kasha)

    YARN-2449. Fixed the bug that TimelineAuthenticationFilterInitializer
    is not automatically added when hadoop.http.filter.initializers is not
    configured. (Varun Vasudev via zjshen)

    YARN-2450. Fix typos in log messages. (Ray Chiang via hitesh)

    YARN-2447. RM web service app submission doesn't pass secrets correctly.
    (Varun Vasudev via jianhe)

    YARN-2462. TestNodeManagerResync#testBlockNewContainerRequestsOnStartAndResync
    should have a test timeout (Eric Payne via jlowe)

    YARN-2431. NM restart: cgroup is not removed for reacquired containers
    (jlowe)

    YARN-2519. Credential Provider related unit tests failed on Windows.
    (Xiaoyu Yao via cnauroth)

    YARN-2526. SLS can deadlock when all the threads are taken by AMSimulators. 
    (Wei Yan via kasha)

    YARN-1458. FairScheduler: Zero weight can lead to livelock. 
    (Zhihai Xu via kasha)

    YARN-2459. RM crashes if App gets rejected for any reason 
    and HA is enabled. (Jian He and Mayank Bansal via xgong)

    YARN-2158. Fixed TestRMWebServicesAppsModification#testSingleAppKill test
    failure. (Varun Vasudev via jianhe)

    YARN-2534. FairScheduler: Potential integer overflow calculating totalMaxShare. 
    (Zhihai Xu via kasha)

    YARN-2541. Fixed ResourceManagerRest.apt.vm table syntax error. (jianhe)

    YARN-2484. FileSystemRMStateStore#readFile/writeFile should close
    FSData(In|Out)putStream in final block (Tsuyoshi OZAWA via jlowe)

    YARN-2456. Possible livelock in CapacityScheduler when RM is recovering apps.
    (Jian He via xgong)

    YARN-2542. Fixed NPE when retrieving ApplicationReport from TimeLineServer.
    (Zhijie Shen via jianhe)

    YARN-2528. Relaxed http response split vulnerability protection for the origins
    header and made it accept multiple origins in CrossOriginFilter. (Jonathan
    Eagles via zjshen)

    YARN-2549. TestContainerLaunch fails due to classpath problem with hamcrest
    classes. (cnauroth)

    YARN-2529. Generic history service RPC interface doesn't work when service
    authorization is enabled. (Zhijie Shen via jianhe)

    YARN-2558. Updated ContainerTokenIdentifier#read/write to use
    ContainerId#getContainerId. (Tsuyoshi OZAWA via jianhe)

    YARN-2559. Fixed NPE in SystemMetricsPublisher when retrieving
    FinalApplicationStatus. (Zhijie Shen via jianhe)

    YARN-1779. Fixed AMRMClient to handle AMRMTokens correctly across
    ResourceManager work-preserving-restart or failover. (Jian He via vinodkv)

    YARN-2363. Submitted applications occasionally lack a tracking URL (jlowe)

    YARN-2561. MR job client cannot reconnect to AM after NM restart. (Junping
    Du via jlowe)

    YARN-2563. Fixed YarnClient to call getTimeLineDelegationToken only if the
    Token is not present. (Zhijie Shen via jianhe)

    YARN-2568. Fixed the potential test failures due to race conditions when RM
    work-preserving recovery is enabled. (Jian He via zjshen)

    YARN-2565. Fixed RM to not use FileSystemApplicationHistoryStore unless
    explicitly set. (Zhijie Shen via jianhe)

    YARN-2460. Remove obsolete entries from yarn-default.xml (Ray Chiang via
    aw)

    YARN-2452. TestRMApplicationHistoryWriter fails with FairScheduler. 
    (Zhihai Xu via kasha)

    YARN-2453. TestProportionalCapacityPreemptionPolicy fails with 
    FairScheduler. (Zhihai Xu via kasha)
    
    YARN-2540. FairScheduler: Queue filters not working on scheduler page in 
    RM UI. (Ashwin Shankar via kasha)

    YARN-2584. TestContainerManagerSecurity fails on trunk. (Jian He via 
    junping_du)

    YARN-2252. Intermittent failure of 
    TestFairScheduler.testContinuousScheduling. 
    (Ratandeep Ratti and kasha via kasha)

    YARN-2161. Fix build on macosx: YARN parts (Binglin Chang via aw)

    YARN-2596. TestWorkPreservingRMRestart fails with FairScheduler. (kasha)

    YARN-2546. Made REST API for application creation/submission use numeric and
    boolean types instead of the string of them. (Varun Vasudev via zjshen)

    YARN-2523. ResourceManager UI showing negative value for "Decommissioned
    Nodes" field (Rohith via jlowe)

    YARN-2608. FairScheduler: Potential deadlocks in loading alloc files and 
    clock access. (Wei Yan via kasha)

    YARN-2606. Application History Server tries to access hdfs before doing
    secure login (Mit Desai via jeagles)

    YARN-2610. Hamlet should close table tags. (Ray Chiang via kasha)

    YARN-2387. Resource Manager crashes with NPE due to lack of
    synchronization (Mit Desai via jlowe)

    YARN-2594. Potential deadlock in RM when querying 
    ApplicationResourceUsageReport. (Wangda Tan via kasha)

    YARN-2602. Fixed possible NPE in ApplicationHistoryManagerOnTimelineStore.
    (Zhijie Shen via jianhe)

    YARN-2630. Prevented previous AM container status from being acquired by the
    current restarted AM. (Jian He via zjshen) 

    YARN-2617. Fixed NM to not send duplicate container status whose app is not
    running. (Jun Gong via jianhe)

    YARN-2624. Resource Localization fails on a cluster due to existing cache
    directories (Anubhav Dhoot via jlowe)

    YARN-2527. Fixed the potential NPE in ApplicationACLsManager and added test
    cases for it. (Benoy Antony via zjshen)

    YARN-2628. Capacity scheduler with DominantResourceCalculator carries out
    reservation even though slots are free. (Varun Vasudev via jianhe)

    YARN-2685. Fixed a bug in CommonNodeLabelsManager that caused wrong resource
    tracking per label when a host runs multiple node-managers. (Wangda Tan via
    vinodkv)

    YARN-2699. Fixed a bug in CommonNodeLabelsManager that caused tests to fail
    when using ephemeral ports on NodeIDs. (Wangda Tan via vinodkv)

    YARN-2705. Fixed bugs in ResourceManager node-label manager that were causing
    test-failures: added a dummy in-memory labels-manager. (Wangda Tan via
    vinodkv)

    YARN-2715. Fixed ResourceManager to respect common configurations for proxy
    users/groups beyond just the YARN level config. (Zhijie Shen via vinodkv)

    YARN-2743. Fixed a bug in ResourceManager that was causing RMDelegationToken
    identifiers to be tampered and thus causing app submission failures in
    secure mode. (Jian He via vinodkv)

  BREAKDOWN OF YARN-1051 SUBTASKS AND RELATED JIRAS

    YARN-1707. Introduce APIs to add/remove/resize queues in the
    CapacityScheduler. (Carlo Curino and Subru Krishnan via curino)

    YARN-2475. Logic for responding to capacity drops for the
    ReservationSystem. (Carlo Curino and Subru Krishnan via curino)

    YARN-1708. Public YARN APIs for creating/updating/deleting
    reservations. (Subru Krishnan and Carlo Curino via subru)

    YARN-1709. In-memory data structures used to track resources over
    time to enable reservations. (Subru Krishnan and Carlo Curino via
    subru)

    YARN-1710. Logic to find allocations within a Plan that satisfy
    user ReservationRequest(s). (Carlo Curino and Subru Krishnan via
    curino)

    YARN-1711. Policy to enforce instantaneous and over-time quotas
    on user reservations. (Carlo Curino and Subru Krishnan via curino)

    YARN-1712. Plan follower that synchronizes the current state of reservation
    subsystem with the scheduler. (Subru Krishnan and Carlo Curino via subru)

    YARN-2080. Integrating reservation system with ResourceManager and
    client-RM protocol. (Subru Krishnan and Carlo Curino via subru)

    MAPREDUCE-6103. Adding reservation APIs to MR resource manager
    delegate. (Subru Krishnan and Carlo Curino via subru)

    YARN-2576. Fixing compilation, javadocs and audit issues to pass
    test patch in branch. (Subru Krishnan and Carlo Curino via subru)

    YARN-2611. Fixing jenkins findbugs warning and TestRMWebServicesCapacitySched
    for branch YARN-1051. (Subru Krishnan and Carlo Curino via subru)

    YARN-2644. Fixed CapacityScheduler to return up-to-date headroom when
    AM allocates. (Craig Welch via jianhe)

    YARN-1857. CapacityScheduler headroom doesn't account for other AM's running.
    (Chen He and Craig Welch via jianhe)

    YARN-2649. Fixed TestAMRMRPCNodeUpdates test failure. (Ming Ma via jianhe)

    YARN-2662. TestCgroupsLCEResourcesHandler leaks file descriptors. (cnauroth)

  BREAKDOWN OF YARN-913 SUBTASKS AND RELATED JIRAS

    YARN-2652 Add hadoop-yarn-registry package under hadoop-yarn. (stevel)

    YARN-2668 yarn-registry JAR won't link against ZK 3.4.5. (stevel)
    
    YARN-2689 TestSecureRMRegistryOperations failing on windows:
    secure ZK won't start (stevel)

    YARN-2692 ktutil test hanging on some machines/ktutil versions (stevel)

    YARN-2700 TestSecureRMRegistryOperations failing on windows: auth problems
    (stevel)

    YARN-2677 registry punycoding of usernames doesn't fix all usernames to be
    DNS-valid (stevel)

    YARN-2768 Improved Yarn Registry service record structure (stevel)

    ---

    YARN-2598 GHS should show N/A instead of null for the inaccessible information
    (Zhijie Shen via mayank)

    YARN-2671. Fixed ApplicationSubmissionContext to still set resource for
    backward compatibility. (Wangda Tan via zjshen)

    YARN-2667. Fix the release audit warning caused by hadoop-yarn-registry
    (Yi Liu via jlowe)

    YARN-2651. Spun off LogRollingInterval from LogAggregationContext. (Xuan Gong
    via zjshen)

    YARN-2377. Localization exception stack traces are not passed as
    diagnostic info (Gera Shegalov via jlowe)

    YARN-2308. Changed CapacityScheduler to explicitly throw exception if the
    queue to which the apps were submitted is changed across RM restart.
    (Craig Welch & Chang Li via jianhe)

    YARN-2566. DefaultContainerExecutor should pick a working directory randomly. 
    (Zhihai Xu via kasha)

    YARN-2588. Standby RM fails to transitionToActive if previous
    transitionToActive failed with ZK exception. (Rohith Sharmaks via jianhe)

    YARN-2701. Potential race condition in startLocalizer when using
    LinuxContainerExecutor. (Xuan Gong via jianhe)

    YARN-2717. Avoided duplicate logging when container logs are not found. (Xuan
    Gong via zjshen)

    YARN-2720. Windows: Wildcard classpath variables not expanded against
    resources contained in archives. (Craig Welch via cnauroth)

    YARN-2721. Suppress NodeExist exception thrown by ZKRMStateStore when it
    retries creating znode. (Jian He via zjshen)

    YARN-2732. Fixed syntax error in SecureContainer.apt.vm. (Jian He via zjshen)

    YARN-2724. Skipped uploading a local log file to HDFS if exception is raised
    when opening it. (Xuan Gong via zjshen)

    YARN-1915. Fixed a race condition that client could use the ClientToAMToken
    to contact with AM before AM actually receives the ClientToAMTokenMasterKey.
    (Jason Lowe via jianhe)

    YARN-2314. Disable ContainerManagementProtocolProxy cache by default to
    prevent creating thousands of threads in a large cluster. (Jason Lowe via
    jianhe)

    YARN-2723. Fix rmadmin -replaceLabelsOnNode does not correctly parse port.
    (Naganarasimha G R via xgong)

    YARN-2734. Skipped sub-folders in the local log dir when aggregating logs.
    (Xuan Gong via zjshen)

    YARN-2726. CapacityScheduler should explicitly log when an accessible
    label has no capacity. (Wangda Tan via xgong)

    YARN-2591. Fixed AHSWebServices to return FORBIDDEN(403) if the request user
    doesn't have access to the history data. (Zhijie Shen via jianhe)

    YARN-2279. Add UTs to cover timeline server authentication.
    (Zhijie Shen via xgong)

    YARN-2758. Update TestApplicationHistoryClientService to use the new generic
    history store. (Zhijie Shen via xgong)

    YARN-2741. Made NM web UI serve logs on the drive other than C: on Windows. (Craig
    Welch via zjshen)

    YARN-2747. Fixed the test failure of TestAggregatedLogFormat when native I/O is
    enabled. (Xuan Gong via zjshen)

    YARN-2769. Fixed the problem that timeline domain is not set in distributed shell
    AM when using shell_command on Windows. (Varun Vasudev via zjshen)

    YARN-2755. NM fails to clean up usercache_DEL_<timestamp> dirs after
    YARN-661 (Siqi Li via jlowe)

    YARN-2698. Moved some node label APIs to be correctly placed in client
    protocol. (Wangda Tan via vinodkv)

    YARN-2789. Re-instated the NodeReport.newInstance private unstable API
    modified in YARN-2698 so that tests in YARN frameworks don't break. (Wangda
    Tan via vinodkv)

    YARN-2707. Potential null dereference in FSDownload (Gera Shegalov via
    jlowe)

    YARN-2711. Fixed TestDefaultContainerExecutor#testContainerLaunchError failure on
    Windows. (Varun Vasudev via zjshen)

    YARN-2790. Fixed a NodeManager bug that was causing log-aggregation to fail
    beyond HFDS delegation-token expiry even when RM is a proxy-user (YARN-2704).
    (Jian He via vinodkv)

    YARN-2785. Fixed intermittent TestContainerResourceUsage failure. (Varun Vasudev
    via zjshen)

    YARN-2730. DefaultContainerExecutor runs only one localizer at a time
    (Siqi Li via jlowe)

    YARN-2798. Fixed YarnClient to populate the renewer correctly for Timeline
    delegation tokens. (Zhijie Shen via vinodkv)

    YARN-2788. Fixed backwards compatiblity issues with log-aggregation feature
    that were caused when adding log-upload-time via YARN-2703. (Xuan Gong via
    vinodkv)

    YARN-2795. Fixed ResourceManager to not crash loading node-label data from
    HDFS in secure mode. (Wangda Tan via vinodkv)

    YARN-1922. Fixed NodeManager to kill process-trees correctly in the presence 
    of races between the launch and the stop-container call and when root
    processes crash. (Billie Rinaldi via vinodkv)

    YARN-2010. Handle app-recovery failures gracefully. 
    (Jian He and Karthik Kambatla via kasha)

    YARN-2804. Fixed Timeline service to not fill the logs with JAXB bindings
    exceptions. (Zhijie Shen via vinodkv)

    YARN-2767. Added a test case to verify that http static user cannot kill or submit
    apps in the secure mode. (Varun Vasudev via zjshen)

    YARN-2805. Fixed ResourceManager to load HA configs correctly before kerberos
    login. (Wangda Tan via vinodkv)

    YARN-2579. Fixed a deadlock issue when EmbeddedElectorService and
    FatalEventDispatcher try to transition RM to StandBy at the same time.
    (Rohith Sharmaks via jianhe)

    YARN-2813. Fixed NPE from MemoryTimelineStore.getDomains. (Zhijie Shen via xgong)

    YARN-2812. TestApplicationHistoryServer is likely to fail on less powerful machine.
    (Zhijie Shen via xgong)

    YARN-2744. Fixed CapacityScheduler to validate node-labels correctly against
    queues. (Wangda Tan via vinodkv)

    YARN-2823. Fixed ResourceManager app-attempt state machine to inform
    schedulers about previous finished attempts of a running appliation to avoid
    expectation mismatch w.r.t transferred containers. (Jian He via vinodkv)

    YARN-2810. TestRMProxyUsersConf fails on Windows VMs. (Varun Vasudev via xgong)

    YARN-2824. Fixed Capacity Scheduler to not crash when some node-labels are
    not mapped to queues by making default capacities per label to be zero.
    (Wangda Tan via vinodkv)

    YARN-2827. Fixed bugs in "yarn queue" CLI. (Wangda Tan via vinodkv)

    YARN-2803. MR distributed cache not working correctly on Windows after
    NodeManager privileged account changes. (Craig Welch via cnauroth)

    YARN-2753. Fixed a bunch of bugs in the NodeLabelsManager classes. (Zhihai xu
    via vinodkv)

    YARN-2825. Container leak on NM (Jian He via jlowe)

    YARN-2819. NPE in ATS Timeline Domains when upgrading from 2.4 to 2.6.
    (Zhijie Shen via xgong)

    YARN-2826. Fixed user-groups mappings' refresh bug caused by YARN-2826.
    (Wangda Tan via vinodkv)

    YARN-2607. Fixed issues in TestDistributedShell. (Wangda Tan via vinodkv)

    YARN-2830. Add backwords compatible ContainerId.newInstance constructor.
    (jeagles via acmurthy) 

    YARN-2834. Fixed ResourceManager to ignore token-renewal failures on recovery
    consistent with the (somewhat incorrect) behaviour in the non-recovery case.
    (Jian He via vinodkv)

    YARN-2841. RMProxy should retry EOFException. (Jian He via xgong)

    YARN-2843. Fixed NodeLabelsManager to trim inputs for hosts and labels so
    as to make them work correctly. (Wangda Tan via vinodkv)

    YARN-2794. Fixed log messages about distributing system-credentials. (Jian He via
    zjshen)

    YARN-2846. Incorrect persist exit code for running containers in
    reacquireContainer() that interrupted by NodeManager restart. (Junping Du
    via jlowe)

    YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user
    kill request races with ApplicationMaster finish. (Jian He via vinodkv)

Release 2.5.2 - 2014-11-19

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES


Release 2.5.1 - 2014-09-05

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 2.5.0 - 2014-08-11

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-1757. NM Recovery. Auxiliary service support. (Jason Lowe via kasha)

    YARN-1864. Fair Scheduler Dynamic Hierarchical User Queues (Ashwin Shankar
    via Sandy Ryza)

    YARN-1362. Distinguish between nodemanager shutdown for decommission vs shutdown 
    for restart. (Jason Lowe via junping_du)

    YARN-1338. Recover localized resource cache state upon nodemanager restart 
    (Jason Lowe via junping_du)

    YARN-1368. Added core functionality of recovering container state into
    schedulers after ResourceManager Restart so as to preserve running work in
    the cluster. (Jian He via vinodkv)

    YARN-1702. Added kill app functionality to RM web services. (Varun Vasudev
    via vinodkv)

    YARN-1339. Recover DeletionService state upon nodemanager restart. (Jason Lowe
    via junping_du)

    YARN-1365. Changed ApplicationMasterService to allow an app to re-register
    after RM restart. (Anubhav Dhoot via jianhe)

    YARN-2052. Embedded an epoch number in container id to ensure the uniqueness
    of container id after RM restarts. (Tsuyoshi OZAWA via jianhe)

    YARN-1713. Added get-new-app and submit-app functionality to RM web services.
    (Varun Vasudev via vinodkv)

    YARN-2233. Implemented ResourceManager web-services to create, renew and
    cancel delegation tokens. (Varun Vasudev via vinodkv)

    YARN-2247. Made RM web services authenticate users via kerberos and delegation
    token. (Varun Vasudev via zjshen)

  IMPROVEMENTS

    YARN-1479. Invalid NaN values in Hadoop REST API JSON response (Chen He via
    jeagles)

    YARN-1736. FS: AppSchedulable.assignContainer's priority argument is 
    redundant. (Naren Koneru via kasha)

    YARN-1678. Fair scheduler gabs incessantly about reservations (Sandy Ryza)

    YARN-1561. Fix a generic type warning in FairScheduler. (Chen He via junping_du)

    YARN-1429. *nix: Allow a way for users to augment classpath of YARN daemons.
    (Jarek Jarcec Cecho via kasha)

    YARN-1520. update capacity scheduler docs to include necessary parameters
    (Chen He via jeagles)

    YARN-1845. Elapsed time for failed tasks that never started is wrong
    (Rushabh S Shah via jeagles)

    YARN-1136. Replace junit.framework.Assert with org.junit.Assert (Chen He
    via jeagles)

    YARN-1889. In Fair Scheduler, avoid creating objects on each call to
    AppSchedulable comparator (Hong Zhiguo via Sandy Ryza)

    YARN-1923. Make Fair Scheduler resource ratio calculations terminate faster
    (Anubhav Dhoot via Sandy Ryza)

    YARN-1870. FileInputStream is not closed in ProcfsBasedProcessTree#constructProcessSMAPInfo. 
    (Fengdong Yu via junping_du)

    YARN-1970. Prepare YARN codebase for JUnit 4.11. (cnauroth)

    YARN-483. Improve documentation on log aggregation in yarn-default.xml
    (Akira Ajisaka via Sandy Ryza)

    YARN-2036. Document yarn.resourcemanager.hostname in ClusterSetup (Ray
    Chiang via Sandy Ryza)

    YARN-766. TestNodeManagerShutdown in branch-2 should use Shell to form the output path and a format 
    issue in trunk. (Contributed by Siddharth Seth)

    YARN-1982. Renamed the daemon name to be TimelineServer instead of History
    Server and deprecated the old usage. (Zhijie Shen via vinodkv)

    YARN-1987. Wrapper for leveldb DBIterator to aid in handling database exceptions.
    (Jason Lowe via kasha)

    YARN-1751. Improve MiniYarnCluster for log aggregation testing (Ming Ma
    via jlowe)

    YARN-1981. Nodemanager version is not updated when a node reconnects (Jason
    Lowe via jeagles)

    YARN-1938. Added kerberos login for the Timeline Server. (Zhijie Shen via
    vinodkv)

    YARN-2017. Merged some of the common scheduler code. (Jian He via vinodkv)

    YARN-2049. Added delegation-token support for the Timeline Server. (Zhijie
    Shen via vinodkv)

    YARN-1936. Added security support for the Timeline Client. (Zhijie Shen via
    vinodkv)

    YARN-1937. Added owner-only ACLs support for Timeline Client and server.
    (Zhijie Shen via vinodkv)

    YARN-2012. Fair Scheduler: allow default queue placement rule to take an
    arbitrary queue (Ashwin Shankar via Sandy Ryza)

    YARN-2059. Added admin ACLs support to Timeline Server. (Zhijie Shen via
    vinodkv)
    
    YARN-2073. Fair Scheduler: Add a utilization threshold to prevent preempting
    resources when cluster is free (Karthik Kambatla via Sandy Ryza)

    YARN-2071. Modified levelDB store permissions to be readable only by the
    server user. (Zhijie Shen via vinodkv)

    YARN-2107. Refactored timeline classes into o.a.h.y.s.timeline package. (Vinod
    Kumar Vavilapalli via zjshen)

    YARN-596. Use scheduling policies throughout the queue hierarchy to decide
    which containers to preempt (Wei Yan via Sandy Ryza)

    YARN-2054. Better defaults for YARN ZK configs for retries and retry-inteval 
    when HA is enabled. (kasha)

    YARN-1877. Document yarn.resourcemanager.zk-auth and its scope. 
    (Robert Kanter via kasha)

    YARN-2115. Replaced RegisterNodeManagerRequest's ContainerStatus with a new
    NMContainerStatus which has more information that is needed for
    work-preserving RM-restart. (Jian He via vinodkv)

    YARN-1474. Make schedulers services. (Tsuyoshi Ozawa via kasha)

    YARN-1913. With Fair Scheduler, cluster can logjam when all resources are
    consumed by AMs (Wei Yan via Sandy Ryza)

    YARN-2061. Revisit logging levels in ZKRMStateStore. (Ray Chiang via kasha)

    YARN-1977. Add tests on getApplicationRequest with filtering start time range. (junping_du)

    YARN-2122. In AllocationFileLoaderService, the reloadThread should be created
    in init() and started in start(). (Robert Kanter via kasha)

    YARN-2132. ZKRMStateStore.ZKAction#runWithRetries doesn't log the exception
    it encounters. (Vamsee Yarlagadda via kasha)

    YARN-2030. Augmented RMStateStore with state machine.(Binglin Chang via jianhe)

    YARN-1424. RMAppAttemptImpl should return the 
    DummyApplicationResourceUsageReport for all invalid accesses. 
    (Ray Chiang via kasha)

    YARN-2091. Add more values to ContainerExitStatus and pass it from NM to
    RM and then to app masters (Tsuyoshi OZAWA via bikas)

    YARN-2125. Changed ProportionalCapacityPreemptionPolicy to log CSV in debug
    level. (Wangda Tan via jianhe)

    YARN-2159. Better logging in SchedulerNode#allocateContainer.
    (Ray Chiang via kasha)

    YARN-2191. Added a new test to ensure NM will clean up completed applications
    in the case of RM restart. (Wangda Tan via jianhe)

    YARN-2195. Clean a piece of code in ResourceRequest. (Wei Yan via devaraj)

    YARN-2074. Changed ResourceManager to not count AM preemptions towards app
    failures. (Jian He via vinodkv)

    YARN-2192. TestRMHA fails when run with a mix of Schedulers.
    (Anubhav Dhoot via kasha)

    YARN-2109. Fix TestRM to work with both schedulers. (Anubhav Dhoot via kasha)

    YARN-2072. RM/NM UIs and webservices are missing vcore information.
    (Nathan Roberts via tgraves)

    YARN-2152. Added missing information into ContainerTokenIdentifier so that
    NodeManagers can report the same to RM when RM restarts. (Jian He via vinodkv)

    YARN-2171. Improved CapacityScheduling to not lock on nodemanager-count when
    AMs heartbeat in. (Jason Lowe via vinodkv)

    YARN-614. Changed ResourceManager to not count disk failure, node loss and
    RM restart towards app failures. (Xuan Gong via jianhe)

    YARN-2224. Explicitly enable vmem check in
    TestContainersMonitor#testContainerKillOnMemoryOverflow.
    (Anubhav Dhoot via kasha)

    YARN-2022. Preempting an Application Master container can be kept as least priority
    when multiple applications are marked for preemption by 
    ProportionalCapacityPreemptionPolicy (Sunil G via mayank)

    YARN-2241. ZKRMStateStore: On startup, show nicer messages if znodes already 
    exist. (Robert Kanter via kasha)

	YARN-1408 Preemption caused Invalid State Event: ACQUIRED at KILLED and 
	caused a task timeout for 30mins. (Sunil G via mayank)

    YARN-2300. Improved the documentation of the sample requests for RM REST API -
    submitting an app. (Varun Vasudev via zjshen)

  OPTIMIZATIONS

  BUG FIXES 

    YARN-1718. Fix a couple isTerminals in Fair Scheduler queue placement rules
    (Sandy Ryza)

    YARN-1790. Fair Scheduler UI not showing apps table (bc Wong via Sandy Ryza)

    YARN-1784. TestContainerAllocation assumes CapacityScheduler.
    (Robert Kanter via kasha)

    YARN-1940. deleteAsUser() terminates early without deleting more files on
    error (Rushabh S Shah via jlowe)

    YARN-1865. ShellScriptBuilder does not check for some error conditions.
    (Remus Rusanu via ivanmi)

    YARN-738. TestClientRMTokens is failing irregularly while running all yarn
    tests (Ming Ma via jlowe)

    YARN-2018. TestClientRMService.testTokenRenewalWrongUser fails after
    HADOOP-10562 (Ming Ma via Arpit Agarwal)

    YARN-2011. Fix typo and warning in TestLeafQueue (Chen He via junping_du)


    YARN-2042. String shouldn't be compared using == in
    QueuePlacementRule#NestedUserQueue#getQueueForApp (Chen He via Sandy Ryza)

    YARN-2050. Fix LogCLIHelpers to create the correct FileContext (Ming Ma
    via jlowe)

    YARN-2089. FairScheduler: QueuePlacementPolicy and QueuePlacementRule 
    are missing audience annotations. (Zhihai Xu via kasha)

    YARN-2096. Race in TestRMRestart#testQueueMetricsOnRMRestart.
    (Anubhav Dhoot via kasha)

    YARN-2105. Fix TestFairScheduler after YARN-2012. (Ashwin Shankar via
    Sandy Ryza)

    YARN-2112. Fixed yarn-common's pom.xml to include jackson dependencies so
    that both Timeline Server and client can access them. (Zhijie Shen via
    vinodkv)

    YARN-1868. YARN status web ui does not show correctly in IE 11.
    (Chuan Liu via cnauroth)

    YARN-2103. Inconsistency between viaProto flag and initial value of 
    SerializedExceptionProto.Builder (Binglin Chang via junping_du)

    YARN-1550. NPE in FairSchedulerAppsBlock#render. (Anubhav Dhoot via kasha)

    YARN-2119. DEFAULT_PROXY_ADDRESS should use DEFAULT_PROXY_PORT.
    (Anubhav Dhoot via kasha)

    YARN-2118. Fixed the type mismatch in Map#containsKey check of
    TimelineWebServices#injectOwnerInfo. (Ted Yu via zjshen)

    YARN-2117. Fixed the issue that secret file reader is potentially not
    closed in TimelineAuthenticationFilterInitializer. (Chen He via zjshen)

    YARN-2121. Fixed NPE handling in Timeline Server's TimelineAuthenticator.
    (Zhijie Shen via vinodkv)

    YARN-2128. FairScheduler: Incorrect calculation of amResource usage.
    (Wei Yan via kasha)

    YARN-2124. Fixed NPE in ProportionalCapacityPreemptionPolicy. (Wangda Tan
    via jianhe)

    YARN-2148. TestNMClient failed due more exit code values added and passed
    to AM (Wangda Tan via bikas)

    YARN-2075. Fixed the test failure of TestRMAdminCLI. (Kenji Kikushima via
    zjshen)

    YARN-2155. FairScheduler: Incorrect threshold check for preemption.
    (Wei Yan via kasha)

    YARN-1885. Fixed a bug that RM may not send application-clean-up signal
    to NMs where the completed applications previously ran in case of RM restart.
    (Wangda Tan via jianhe)

    YARN-2167. LeveldbIterator should get closed in
    NMLeveldbStateStoreService#loadLocalizationState() within finally block
    (Junping Du via jlowe)

    YARN-2187. FairScheduler: Disable max-AM-share check by default.
    (Robert Kanter via kasha)

    YARN-2111. In FairScheduler.attemptScheduling, we don't count containers
    as assigned if they have 0 memory but non-zero cores (Sandy Ryza)

    YARN-2204. TestAMRestart#testAMRestartWithExistingContainers assumes
    CapacityScheduler. (Robert Kanter via kasha)

    YARN-2163. WebUI: Order of AppId in apps table should be consistent with
    ApplicationId.compareTo(). (Wangda Tan via raviprak)

    YARN-2104. Scheduler queue filter failed to work because index of queue
    column changed. (Wangda Tan via jlowe)

    YARN-2201. Made TestRMWebServicesAppsModification be independent of the
    changes on yarn-default.xml. (Varun Vasudev via zjshen)

    YARN-2216 YARN-2065 AM cannot create new containers after restart
    (Jian He via stevel)

    YARN-2232. Fixed ResourceManager to allow DelegationToken owners to be able
    to cancel their own tokens in secure mode. (Varun Vasudev via vinodkv)

    YARN-2250. FairScheduler.findLowestCommonAncestorQueue returns null when
    queues not identical (Krisztian Horvath via Sandy Ryza)

    YARN-2158. Improved assertion messages of TestRMWebServicesAppsModification.
    (Varun Vasudev via zjshen)

    YARN-2269. Remove external links from YARN UI. (Craig Welch via xgong)

    YARN-2270. Made TestFSDownload#testDownloadPublicWithStatCache be skipped
    when there’s no ancestor permissions. (Akira Ajisaka via zjshen)

    YARN-2319. Made the MiniKdc instance start/close before/after the class of
    TestRMWebServicesDelegationTokens. (Wenwu Peng via zjshen)

    YARN-2335. Annotate all hadoop-sls APIs as @Private. (Wei Yan via kasha)

    YARN-1726. ResourceSchedulerWrapper broken due to AbstractYarnScheduler. 
    (Wei Yan via kasha)

    YARN-2216. TestRMApplicationHistoryWriter sometimes fails in trunk.
    (Zhijie Shen via xgong)

Release 2.4.1 - 2014-06-23 

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-1892. Improved some logs in the scheduler. (Jian He via zjshen)

    YARN-1696. Added documentation for ResourceManager fail-over. (Karthik
    Kambatla, Masatake Iwasaki, Tsuyoshi OZAWA via vinodkv)

    YARN-1701. Improved default paths of the timeline store and the generic
    history store. (Tsuyoshi Ozawa via zjshen)

    YARN-1962. Changed Timeline Service client configuration to be off by default
    given the non-readiness of the feature yet. (Mohammad Kamrul Islam via
    vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    YARN-1898. Made Standby RM links conf, stacks, logLevel, metrics, jmx, logs
    and static not be redirected to Active RM. (Xuan Gong via zjshen)

    YARN-1837. Fixed TestMoveApplication#testMoveRejectedByScheduler failure.
    (Hong Zhiguo via jianhe)

    YARN-1905. TestProcfsBasedProcessTree must only run on Linux. (cnauroth)

    YARN-1883. TestRMAdminService fails due to inconsistent entries in
    UserGroups (Mit Desai via jeagles)

    YARN-1908. Fixed DistributedShell to not fail in secure clusters. (Vinod
    Kumar Vavilapalli and Jian He via vinodkv)

    YARN-1910. Fixed a race condition in TestAMRMTokens that causes the test to
    fail more often on Windows. (Xuan Gong via vinodkv)

    YARN-1920. Fixed TestFileSystemApplicationHistoryStore failure on windows.
    (Vinod Kumar Vavilapalli via zjshen)

    YARN-1914. Fixed resource-download on NodeManagers to skip permission
    verification of public cache files in Windows+local file-system environment.
    (Varun Vasudev via vinodkv)

    YARN-1903. Set exit code and diagnostics when container is killed at
    NEW/LOCALIZING state. (Zhijie Shen via jianhe)

    YARN-1924. Made ZKRMStateStore updateApplication(Attempt)StateInternal work
    when Application(Attempt) state hasn't been stored before. (Jian He via
    zjshen)

    YARN-1926. Changed DistributedShell to use appIDs as unique identifiers for
    HDFS paths and thus avoid test failures on Windows. (Varun Vasudev via
    vinodkv)

    YARN-1833. TestRMAdminService Fails in trunk and branch-2 (Mit Desai via
    jeagles)

    YARN-1907. TestRMApplicationHistoryWriter#testRMWritingMassiveHistory 
    intermittently fails. (Mit Desai via kihwal)

    YARN-1933. Fixed test issues with TestAMRestart and TestNodeHealthService.
    (Jian He via vinodkv)

    YARN-1928. Fixed a race condition in TestAMRMRPCNodeUpdates which caused it
    to fail occassionally. (Zhijie Shen via vinodkv)

    YARN-1934. Fixed a potential NPE in ZKRMStateStore caused by handling
    Disconnected event from ZK. (Karthik Kambatla via jianhe)

    YARN-1931. Private API change in YARN-1824 in 2.4 broke compatibility 
    with previous releases (Sandy Ryza via tgraves)

    YARN-1750. TestNodeStatusUpdater#testNMRegistration is incorrect in test 
    case. (Wangda Tan via junping_du)

    YARN-1947. TestRMDelegationTokens#testRMDTMasterKeyStateOnRollingMasterKey 
    is failing intermittently. (Jian He via junping_du)

    YARN-1281. Fixed TestZKRMStateStoreZKClientConnections to not fail
    intermittently due to ZK-client timeouts. (Tsuyoshi Ozawa via vinodkv) 

    YARN-1932. Javascript injection on the job status page (Mit Desai via
    jlowe)

    YARN-1975. Used resources shows escaped html in CapacityScheduler and
    FairScheduler page (Mit Desai via jlowe)

    YARN-1929. Fixed a deadlock in ResourceManager that occurs when failover
    happens right at the time of shutdown. (Karthik Kambatla via vinodkv)

    YARN-1201. TestAMAuthorization fails with local hostname cannot be resolved. 
    (Wangda Tan via junping_du)

    YARN-1861. Fixed a bug in RM to reset leader-election on fencing that was
    causing both RMs to be stuck in standby mode when automatic failover is
    enabled. (Karthik Kambatla and Xuan Gong via vinodkv)

    YARN-1957. Consider the max capacity of the queue when computing the ideal
    capacity for preemption. (Carlo Curino via cdouglas)

    YARN-1986. In Fifo Scheduler, node heartbeat in between creating app and
    attempt causes NPE (Hong Zhiguo via Sandy Ryza)

    YARN-1976. Fix yarn application CLI to print the scheme of the tracking url
    of failed/killed applications. (Junping Du via jianhe)

    YARN-2016. Fix a bug in GetApplicationsRequestPBImpl to add the missed fields
    to proto. (Junping Du via jianhe)

    YARN-2053. Fixed a bug in AMS to not add null NMToken into NMTokens list from
    previous attempts for work-preserving AM restart. (Wangda Tan via jianhe)

    YARN-2066. Wrong field is referenced in GetApplicationsRequestPBImpl#mergeLocalToBuilder()
    (Hong Zhiguo via junping_du)

    YARN-2081. Fixed TestDistributedShell failure after YARN-1962. (Zhiguo Hong
    via zjshen)

Release 2.4.0 - 2014-04-07 

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-930. Bootstrapping ApplicationHistoryService module. (vinodkv)
  
    YARN-947. Implementing the data objects to be used by the History reader
    and writer interfaces. (Zhijie Shen via vinodkv)
  
    YARN-934. Defined a Writer Interface for HistoryStorage. (Zhijie Shen via
    vinodkv)
  
    YARN-925. Defined a Reader Interface for HistoryStorage. (Mayank Bansal via
    vinodkv)
  
    YARN-978. Created ApplicationAttemptReport. (Mayank Bansal via vinodkv)
  
    YARN-956. Added a testable in-memory HistoryStorage. (Mayank Bansal via
    vinodkv)
  
    YARN-975. Added a file-system implementation for HistoryStorage. (Zhijie Shen
    via vinodkv)
  
    YARN-1123. Added a new ContainerReport and its Protobuf implementation. (Mayank
    Bansal via vinodkv)
  
    YARN-979. Added more APIs for getting information about ApplicationAttempts
    and Containers from ApplicationHistoryProtocol. (Mayank Bansal and Zhijie Shen
    via vinodkv)
  
    YARN-953. Changed ResourceManager to start writing history data. (Zhijie Shen
    via vinodkv)
  
    YARN-1266. Implemented PB service and client wrappers for
    ApplicationHistoryProtocol. (Mayank Bansal via vinodkv)
  
    YARN-955. Implemented ApplicationHistoryProtocol handler. (Mayank Bansal via
    vinodkv)
  
    YARN-1242. Changed yarn scripts to be able to start ApplicationHistoryServer
    as an individual process. (Mayank Bansal via vinodkv)
  
    YARN-954. Implemented web UI for the ApplicationHistoryServer and wired it into
    the HistoryStorage. (Zhijie Shen via vinodkv)
  
    YARN-967. Added the client and CLI interfaces for obtaining ApplicationHistory
    data. (Mayank Bansal via vinodkv)
  
    YARN-1023. Added Webservices REST APIs support for Application History. (Zhijie
    Shen via vinodkv)
  
    YARN-1413. Implemented serving of aggregated-logs in the ApplicationHistory
    server. (Mayank Bansal via vinodkv)

    YARN-1633. Defined user-facing entity, entity-info and event objects related
    to Application Timeline feature. (Zhijie Shen via vinodkv)

    YARN-1611. Introduced the concept of a configuration provider which can be
    used by ResourceManager to read configuration locally or from remote systems
    so as to help RM failover. (Xuan Gong via vinodkv)

    YARN-1659. Defined the ApplicationTimelineStore store as an abstraction for
    implementing different storage impls for storing timeline information.
    (Billie Rinaldi via vinodkv)

    YARN-1634. Added a testable in-memory implementation of
    ApplicationTimelineStore. (Zhijie Shen via vinodkv)

    YARN-1461. Added tags for YARN applications and changed RM to handle them.
    (Karthik Kambatla via zjshen)

    YARN-1636. Augmented Application-history server's web-services to also expose
    new APIs for retrieving and storing timeline information. (Zhijie Shen via
    vinodkv)

    YARN-1490. Introduced the ability to make ResourceManager optionally not kill
    all containers when an ApplicationMaster exits. (Jian He via vinodkv)

    YARN-1041. Added the ApplicationMasterProtocol API for applications to use the
    ability in ResourceManager to optionally not kill containers when the
    ApplicationMaster exits. (Jian He via vinodkv)

    YARN-1566. Changed Distributed Shell to retain containers across application
    attempts. (Jian He via vinodkv)

    YARN-1635. Implemented a Leveldb based ApplicationTimelineStore. (Billie
    Rinaldi via zjshen)

    YARN-1637. Implemented a client library for Java users to post timeline
    entities and events. (zjshen)
    
    YARN-1496. Protocol additions to allow moving apps between queues (Sandy
    Ryza)

    YARN-1498. Common scheduler changes for moving apps between queues (Sandy
    Ryza)

    YARN-1504. RM changes for moving apps between queues (Sandy Ryza)

    YARN-1499. Fair Scheduler changes for moving apps between queues (Sandy
    Ryza)

    YARN-1497. Command line additions for moving apps between queues (Sandy
    Ryza)

    YARN-1588. Enhanced RM and the scheduling protocol to also send NMTokens of
    transferred containers from previous app-attempts to new AMs after YARN-1490.
    (Jian He via vinodkv)

    YARN-1717. Enabled periodically discarding old data in LeveldbTimelineStore.
    (Billie Rinaldi via zjshen)

    YARN-1690. Made DistributedShell send timeline entities+events. (Mayank Bansal
    via zjshen)

    YARN-1775. Enhanced ProcfsBasedProcessTree to optionally add the ability to
    use smaps for obtaining used memory information. (Rajesh Balamohan via
    vinodkv)

    YARN-1838. Enhanced timeline service getEntities API to get entities from a
    given entity ID or insertion timestamp. (Billie Rinaldi via zjshen)

  IMPROVEMENTS

    YARN-1007. Enhance History Reader interface for Containers. (Mayank Bansal via
    devaraj)
  
    YARN-974. Added more information to RMContainer to be collected and recorded in
    Application-History. (Zhijie Shen via vinodkv)
  
    YARN-987. Added ApplicationHistoryManager responsible for exposing reports to
    all clients. (Mayank Bansal via vinodkv)

    YARN-1630. Introduce timeout for async polling operations in YarnClientImpl
    (Aditya Acharya via Sandy Ryza)

    YARN-1617. Remove ancient comment and surround LOG.debug in
    AppSchedulingInfo.allocate (Sandy Ryza)

    YARN-1639. Modified RM HA configuration handling to have a way of not
    requiring separate configuration files for each RM. (Xuan Gong via vinodkv)

    YARN-1668. Modified RM HA handling of admin-acls to be available across RM
    failover by making using of a remote configuration-provider. (Xuan Gong via
    vinodkv)

    YARN-1667. Modified RM HA handling of super users (with proxying ability) to
    be available across RM failover by making using of a remote
    configuration-provider. (Xuan Gong via vinodkv)

    YARN-1285. Changed the default value of yarn.acl.enable in yarn-default.xml
    to be consistent with what exists (false) in the code and documentation.
    (Kenji Kikushima via vinodkv)

    YARN-1669. Modified RM HA handling of protocol level service-ACLS to
    be available across RM failover by making using of a remote
    configuration-provider. (Xuan Gong via vinodkv)

    YARN-1665. Simplify the configuration of RM HA by having better default
    values. (Xuan Gong via vinodkv)

    YARN-1660. Simplified the RM HA configuration to accept and be able to simply
    depend just on configuration properties of the form
    yarn.resourcemanager.hostname.RMID and use the default ports for all service
    addresses. (Xuan Gong via vinodkv)

    YARN-1493. Changed ResourceManager and Scheduler interfacing to recognize
    app-attempts separately from apps. (Jian He via vinodkv)

    YARN-1459. Changed ResourceManager to depend its service initialization
    on the configuration-provider mechanism during startup too. (Xuan Gong via
    vinodkv)

    YARN-1706. Created an utility method to dump timeline records to JSON
    strings. (zjshen)

    YARN-1641. ZK store should attempt a write periodically to ensure it is 
    still Active. (kasha)

    YARN-1531. True up yarn command documentation (Akira Ajisaka via kasha)

    YARN-1345. Remove FINAL_SAVING state from YarnApplicationAttemptState
    (Zhijie Shen via jianhe)

    YARN-1676. Modified RM HA handling of user-to-group mappings to
    be available across RM failover by making using of a remote
    configuration-provider. (Xuan Gong via vinodkv)

    YARN-1666. Modified RM HA handling of include/exclude node-lists to be
    available across RM failover by making using of a remote
    configuration-provider. (Xuan Gong via vinodkv)

    YARN-1171. Add default queue properties to Fair Scheduler documentation
    (Naren Koneru via Sandy Ryza)

    YARN-1470. Add audience annotations to MiniYARNCluster. (Anubhav Dhoot
    via kasha)

    YARN-1732. Changed types of related-entities and primary-filters in the
    timeline-service to be sets instead of maps. (Billie Rinaldi via vinodkv)

    YARN-1687. Renamed user-facing records for the timeline-service to be simply
    named after 'timeline' instead of 'apptimeline'. (Zhijie Shen via vinodkv)

    YARN-1749. Updated application-history related configs to reflect the latest
    reality and to be consistently named. (Zhijie Shen via vinodkv)

    YARN-1301. Added the INFO level log of the non-empty blacklist additions
    and removals inside ApplicationMasterService. (Tsuyoshi Ozawa via zjshen)

    YARN-1528. Allow setting auth for ZK connections. (kasha)

    YARN-1704. Modified LICENSE and NOTICE files to reflect newly used levelDB
    related libraries. (Billie Rinaldi via vinodkv)

    YARN-1765. Added test cases to verify that killApplication API works across
    ResourceManager failover. (Xuan Gong via vinodkv) 

    YARN-1730. Implemented simple write-locking in the LevelDB based timeline-
    store. (Billie Rinaldi via vinodkv)

    YARN-986. Changed client side to be able to figure out the right RM Delegation
    token for the right ResourceManager when HA is enabled. (Karthik Kambatla via
    vinodkv)

    YARN-1761. Modified RMAdmin CLI to check whether HA is enabled or not before
    it executes any of the HA admin related commands. (Xuan Gong via vinodkv)

    YARN-1780. Improved logging in the Timeline client and server. (Zhijie Shen
    via vinodkv)

    YARN-1525. Web UI should redirect to active RM when HA is enabled. (Cindy Li
    via kasha)

    YARN-1781. Modified NodeManagers to allow admins to specify max disk
    utilization for local disks so as to be able to offline full disks. (Varun
    Vasudev via vinodkv)

    YARN-1410. Added tests to validate that clients can fail-over to a new RM
    after getting an application-ID but before submission and can still submit to
    the newly active RM with no issues. (Xuan Gong via vinodkv)

    YARN-1764. Modified YarnClient to correctly handle failover of ResourceManager
    after the submitApplication call goes through. (Xuan Gong via vinodkv)

    YARN-1389. Made ApplicationClientProtocol and ApplicationHistoryProtocol
    expose analogous getApplication(s)/Attempt(s)/Container(s) APIs. (Mayank
    Bansal via zjshen)

    YARN-1658. Modified web-app framework to let standby RMs redirect
    web-service calls to the active RM. (Cindy Li via vinodkv)

    YARN-1824. Improved NodeManager and clients to be able to handle cross
    platform application submissions. (Jian He via vinodkv)

    YARN-1512. Enhanced CapacityScheduler to be able to decouple scheduling from
    node-heartbeats. (Arun C Murthy via vinodkv)

    YARN-1570. Fixed formatting of the lines in YarnCommands.apt.vm docs source.
    (Akira Ajisaka via vinodkv)

    YARN-1536. Cleanup: Get rid of ResourceManager#get*SecretManager() methods 
    and use the RMContext methods instead. (Anubhav Dhoot via kasha)

    YARN-1850. Introduced the ability to optionally disable sending out timeline-
    events in the TimelineClient. (Zhijie Shen via vinodkv)

    YARN-1452. Added documentation about the configuration and usage of generic
    application history and the timeline data service. (Zhijie Shen via vinodkv)

    YARN-1891. Added documentation for NodeManager health-monitoring. (Varun
    Vasudev via vinodkv)

    YARN-1017. Added documentation for ResourceManager Restart.(jianhe)

  OPTIMIZATIONS

    YARN-1771. Reduce the number of NameNode operations during localization of
    public resources using a cache. (Sangjin Lee via cdouglas)

  BUG FIXES

    YARN-935. Correcting pom.xml to build applicationhistoryserver module
    successfully. (Zhijie Shen via vinodkv)
  
    YARN-962. Fixed bug in application-history proto file and renamed it be just
    a client proto file. (Zhijie Shen via vinodkv)
  
    YARN-984. Renamed the incorrectly named applicationhistoryservice.records.pb.impl
    package to be applicationhistoryservice.records.impl.pb. (Devaraj K via vinodkv)
  
    YARN-1534. Fixed failure of test TestAHSWebApp. (Shinichi Yamashita via vinodkv)
  
    YARN-1555. Fixed test failures in applicationhistoryservice.* (Vinod Kumar 
    Vavilapalli via mayank)
  
    YARN-1594. Updated pom.xml of applicationhistoryservice sub-project according to
    YARN-888. (Vinod Kumar Vavilapalli via zjshen)
  
    YARN-1596. Fixed Javadoc warnings on branch YARN-321. (Vinod Kumar Vavilapalli
    via zjshen)
  
    YARN-1597. Fixed Findbugs warnings on branch YARN-321. (Vinod Kumar Vavilapalli
    via zjshen)
  
    YARN-1595. Made enabling history service configurable and fixed test failures on
    branch YARN-321. (Vinod Kumar Vavilapalli via zjshen)
  
    YARN-1605. Fixed formatting issues in the new module on branch YARN-321. (Vinod
    Kumar Vavilapalli via zjshen)

    YARN-1625. Fixed RAT warnings after YARN-321 merge. (Shinichi Yamashita via
    vinodkv)

    YARN-1613. Fixed the typo with the configuration name
    YARN_HISTORY_SERVICE_ENABLED. (Akira Ajisaka via vinodkv)

    YARN-1618. Fix invalid RMApp transition from NEW to FINAL_SAVING (kasha)

    YARN-1600. RM does not startup when security is enabled without spnego
    configured (Haohui Mai via jlowe)

    YARN-1642. RMDTRenewer#getRMClient should use ClientRMProxy (kasha)

    YARN-1632. TestApplicationMasterServices should be under
    org.apache.hadoop.yarn.server.resourcemanager package (Chen He via jeagles)

    YARN-1673. Fix option parsing in YARN's application CLI after it is broken
    by YARN-967. (Mayank Bansal via vinodkv)

    YARN-1684. Fixed history server heap size in yarn script. (Billie Rinaldi
    via zjshen)

    YARN-1166. Fixed app-specific and attempt-specific QueueMetrics to be
    triggered by accordingly app event and attempt event. 

    YARN-1689. Made RMAppAttempt get killed when RMApp is at ACCEPTED. (Vinod
    Kumar Vavilapalli via zjshen)

    YARN-1661. Fixed DS ApplicationMaster to write the correct exit log. (Vinod
    Kumar Vavilapalli via zjshen)

    YARN-1672. YarnConfiguration is missing a default for 
    yarn.nodemanager.log.retain-seconds (Naren Koneru via kasha)

    YARN-1698. Fixed default TimelineStore in code to match what is documented
    in yarn-default.xml (Zhijie Shen via vinodkv)

    YARN-1697. NodeManager reports negative running containers (Sandy Ryza)

    YARN-1719. Fixed the root path related Jersey warnings produced in
    ATSWebServices. (Billie Rinaldi via zjshen)

    YARN-1692. ConcurrentModificationException in fair scheduler AppSchedulable
    (Sangjin Lee via Sandy Ryza)

    YARN-1578. Fixed reading incomplete application attempt and container data
    in FileSystemApplicationHistoryStore. (Shinichi Yamashita via zjshen)

    YARN-1417. Modified RM to generate container-tokens not at creation time, but
    at allocation time so as to prevent RM from shelling out containers with
    expired tokens. (Omkar Vinit Joshi and Jian He via vinodkv)

    YARN-1553. Modified YARN and MR to stop using HttpConfig.isSecure() and
    instead rely on the http policy framework. And also fix some bugs related
    to https handling in YARN web-apps. (Haohui Mai via vinodkv)

    YARN-1721. When moving app between queues in Fair Scheduler, grab lock on
    FSSchedulerApp (Sandy Ryza)

    YARN-1724. Race condition in Fair Scheduler when continuous scheduling is
    turned on (Sandy Ryza)

    YARN-1590. Fixed ResourceManager, web-app proxy and MR JobHistoryServer to
    expand _HOST properly in their kerberos principles. (Mohammad Kamrul Islam
    va vinodkv)

    YARN-1428. Fixed RM to write the final state of RMApp/RMAppAttempt to the 
    application history store in the transition to the final state. (Contributed
    by Zhijie Shen)

    YARN-713. Fixed ResourceManager to not crash while building tokens when DNS
    issues happen transmittently. (Jian He via vinodkv)

    YARN-1398. Fixed a deadlock in ResourceManager between users requesting
    queue-acls and completing containers. (vinodkv)

    YARN-1071. Enabled ResourceManager to recover cluster metrics
    numDecommissionedNMs after restarting. (Jian He via zjshen)

    YARN-1742. Fixed javadoc of configuration parameter
    DEFAULT_NM_MIN_HEALTHY_DISKS_FRACTION. (Akira Ajisaka via vinodkv)

    YARN-1686. Fixed NodeManager to properly handle any errors during
    re-registration after a RESYNC and thus avoid hanging. (Rohith Sharma via
    vinodkv)

    YARN-1734. Fixed ResourceManager to update the configurations when it
    transits from standby to active mode so as to assimilate any changes that
    happened while it was in standby mode. (Xuan Gong via vinodkv)

    YARN-1760. TestRMAdminService assumes CapacityScheduler. (kasha)

    YARN-1758. Fixed ResourceManager to not mandate the presence of site specific
    configuration files and thus fix failures in downstream tests. (Xuan Gong via
    vinodkv)

    YARN-1748. Excluded core-site.xml from hadoop-yarn-server-tests package's jar
    and thus avoid breaking downstream tests. (Sravya Tirukkovalur via vinodkv)

    YARN-1729. Made TimelineWebServices deserialize the string primary- and
    secondary-filters param into the JSON-compatible object. (Billie Rinaldi via
    zjshen)

    YARN-1766. Fixed a bug in ResourceManager to use configuration loaded from the
    configuration-provider when booting up. (Xuan Gong via vinodkv)

    YARN-1768. Fixed error message being too verbose when killing a non-existent
    application. (Tsuyoshi OZAWA via raviprak)
    
    YARN-1774. FS: Submitting to non-leaf queue throws NPE. (Anubhav Dhoot and
    Karthik Kambatla via kasha)

    YARN-1783. Fixed a bug in NodeManager's status-updater that was losing
    completed container statuses when NodeManager is forced to resync by the
    ResourceManager. (Jian He via vinodkv) 

    YARN-1787. Fixed help messages for applicationattempt and container
    sub-commands in bin/yarn. (Zhijie Shen via vinodkv)

    YARN-1793. Fixed ClientRMService#forceKillApplication not killing unmanaged
    application. (Karthik Kambatla via jianhe)

    YARN-1788. Fixed a bug in ResourceManager to set the apps-completed and
    apps-killed metrics correctly for killed applications. (Varun Vasudev via
    vinodkv)

    YARN-1821. NPE on registerNodeManager if the request has containers for 
    UnmanagedAMs. (kasha)

    YARN-1800. Fixed NodeManager to gracefully handle RejectedExecutionException
    in the public-localizer thread-pool. (Varun Vasudev via vinodkv)

    YARN-1444. Fix CapacityScheduler to deal with cases where applications
    specify host/rack requests without off-switch request. (Wangda Tan via
    acmurthy)

    YARN-1812. Fixed ResourceManager to synchrously renew tokens after recovery
    and thus recover app itself synchronously and avoid races with resyncing
    NodeManagers. (Jian He via vinodkv)

    YARN-1816. Fixed ResourceManager to get RMApp correctly handle
    ATTEMPT_FINISHED event at ACCEPTED state that can happen after RM restarts.
    (Jian He via vinodkv)

    YARN-1789. ApplicationSummary does not escape newlines in the app name
    (Tsuyoshi OZAWA via jlowe)

    YARN-1830. Fixed TestRMRestart#testQueueMetricsOnRMRestart failure due to
    race condition when app is submitted. (Zhijie Shen via jianhe)

    YARN-1685. Fixed few bugs related to handling of containers' log-URLs on
    ResourceManager and history-service. (Zhijie Shen via vinodkv)

    YARN-1206. Fixed AM container log to show on NM web page after application
    finishes if log-aggregation is disabled. (Rohith Sharmaks via jianhe)

    YARN-1591. Fixed AsyncDispatcher to handle interrupts on shutdown in a sane
    manner and thus fix failure of TestResourceTrackerService. (Tsuyoshi Ozawa
    via vinodkv)

    YARN-1839. Fixed handling of NMTokens in ResourceManager such that containers
    launched by AMs running on the same machine as the AM are correctly
    propagated. (Jian He via vinodkv)

    YARN-1640. Fixed manual failover of ResourceManagers to work correctly in
    secure clusters. (Xuan Gong via vinodkv)

    YARN-1855. Made Application-history server to be optional in MiniYARNCluster
    and thus avoid the failure of TestRMFailover#testRMWebAppRedirect. (Zhijie
    Shen via vinodkv)

    YARN-1859. Fixed WebAppProxyServlet to correctly handle applications absent
    on the ResourceManager. (Zhijie Shen via vinodkv)

    YARN-1811. Fixed AMFilters in YARN to correctly accept requests from either
    web-app proxy or the RMs when HA is enabled. (Robert Kanter via vinodkv)

    YARN-1670. Fixed a bug in log-aggregation that can cause the writer to write
    more log-data than the log-length that it records. (Mit Desai via vinodk)

    YARN-1849. Fixed NPE in ResourceTrackerService#registerNodeManager for UAM
    (Karthik Kambatla via jianhe )

    YARN-1863. Fixed test failure in TestRMFailover after YARN-1859. (Xuan Gong
    via vinodkv)

    YARN-1854. Fixed test failure in TestRMHA#testStartAndTransitions. (Rohith
    Sharma KS via vinodkv)

    YARN-1776. Fixed DelegationToken renewal to survive RM failover. (Zhijie
    Shen via jianhe)

    YARN-1577. Made UnmanagedAMLauncher do launchAM after the attempt reaches
    the LAUNCHED state. (Jian He via zjshen)

    YARN-1785. FairScheduler treats app lookup failures as ERRORs. 
    (bc Wong via kasha)

    YARN-1752. Fixed ApplicationMasterService to reject unregister request if
    AM did not register before. (Rohith Sharma via jianhe)

    YARN-1846. TestRM#testNMTokenSentForNormalContainer assumes CapacityScheduler.
    (Robert Kanter via kasha)

    YARN-1705. Reset cluster-metrics on transition to standby. (Rohith via kasha)

    YARN-1852. Fixed RMAppAttempt to not resend AttemptFailed/AttemptKilled
    events to already recovered Failed/Killed RMApps. (Rohith via jianhe)

    YARN-1866. Fixed an issue with renewal of RM-delegation tokens on restart or
    fail-over. (Jian He via vinodkv)

    YARN-1867. Fixed a bug in ResourceManager that was causing invalid ACL checks
    in the web-services after fail-over. (Vinod Kumar Vavilapalli)

    YARN-1521. Mark Idempotent/AtMostOnce annotations to the APIs in
    ApplicationClientProtcol, ResourceManagerAdministrationProtocol and
    ResourceTrackerProtocol so that they work in HA scenario. (Xuan Gong
    via jianhe)

    YARN-1873. Fixed TestDistributedShell failure when the test cases are out of
    order. (Mit Desai via zjshen)

    YARN-1893. Mark AtMostOnce annotation to ApplicationMasterProtocol#allocate.
    (Xuan Gong via jianhe)

Release 2.3.1 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 2.3.0 - 2014-02-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-649. Added a new NM web-service to serve container logs in plain text
    over HTTP. (Sandy Ryza via vinodkv)

    YARN-1021. Yarn Scheduler Load Simulator. (ywskycn via tucu)

    YARN-1010. FairScheduler: decouple container scheduling from nodemanager
    heartbeats. (Wei Yan via Sandy Ryza)

    YARN-1253. Changes to LinuxContainerExecutor to run containers as a single 
    dedicated user in non-secure mode. (rvs via tucu)

    YARN-1027. Implement RMHAProtocolService (Karthik Kambatla via bikas)

    YARN-1068. Add admin support for HA operations (Karthik Kambatla via
    bikas)

    YARN-311. RM/scheduler support for dynamic resource configuration.
    (Junping Du via llu)

    YARN-1392. Allow sophisticated app-to-queue placement policies in the Fair
    Scheduler (Sandy Ryza)

    YARN-1447. Common PB type definitions for container resizing. (Wangda Tan
    via Sandy Ryza)

    YARN-1448. AM-RM protocol changes to support container resizing (Wangda Tan
    via Sandy Ryza)

    YARN-312. Introduced ResourceManagerAdministrationProtocol changes to support
    changing resources on node. (Junping Du via vinodkv)

    YARN-1028. Added FailoverProxyProvider capability to ResourceManager to help
    with RM failover. (Karthik Kambatla via vinodkv)

    YARN-1029. Added embedded leader election in the ResourceManager. (Karthik
    Kambatla via vinodkv)

    YARN-1033. Expose RM active/standby state to Web UI and REST API (kasha)

  IMPROVEMENTS

    YARN-305. Fair scheduler logs too many "Node offered to app" messages.
    (Lohit Vijayarenu via Sandy Ryza)

    YARN-1258. Allow configuring the Fair Scheduler root queue (Sandy Ryza)

    YARN-1288. Make Fair Scheduler ACLs more user friendly (Sandy Ryza)

    YARN-1315. TestQueueACLs should also test FairScheduler (Sandy Ryza)

    YARN-1335. Move duplicate code from FSSchedulerApp and FiCaSchedulerApp
    into SchedulerApplication (Sandy Ryza)

    YARN-1333. Support blacklisting in the Fair Scheduler (Tsuyoshi Ozawa via
    Sandy Ryza)

    YARN-1109. Demote NodeManager "Sending out status for container" logs to
    debug (haosdent via Sandy Ryza)

    YARN-1321. Changed NMTokenCache to support both singleton and an instance
    usage. (Alejandro Abdelnur via vinodkv) 

    YARN-1388. Fair Scheduler page always displays blank fair share (Liyin Liang
    via Sandy Ryza)

    YARN-7. Support CPU resource for DistributedShell. (Junping Du via llu)

    YARN-905. Add state filters to nodes CLI (Wei Yan via Sandy Ryza)

    YARN-1098. Separate out RM services into Always On and Active (Karthik
    Kambatla via bikas)

    YARN-353. Add Zookeeper-based store implementation for RMStateStore.
    (Bikas Saha, Jian He and Karthik Kambatla via hitesh)

    YARN-819. ResourceManager and NodeManager should check for a minimum allowed
    version (Robert Parker via jeagles)

    YARN-425. coverage fix for yarn api (Aleksey Gorshkov via jeagles)

    YARN-1199. Make NM/RM Versions Available (Mit Desai via jeagles)

    YARN-1232. Configuration to support multiple RMs (Karthik Kambatla via
    bikas)

    YARN-465. fix coverage org.apache.hadoop.yarn.server.webproxy (Aleksey
    Gorshkov and Andrey Klochkov via jlowe)

    YARN-976. Document the meaning of a virtual core. (Sandy Ryza)

    YARN-1182. MiniYARNCluster creates and inits the RM/NM only on start()
    (Karthik Kambatla via Sandy Ryza)

    HADOOP-9598. Improve code coverage of RMAdminCLI (Aleksey Gorshkov and
    Andrey Klochkov via jeagles)

    YARN-1306. Clean up hadoop-sls sample-conf according to YARN-1228 (Wei Yan
    via Sandy Ryza)

    YARN-891. Modified ResourceManager state-store to remember completed
    applications so that clients can get information about them post RM-restart.
    (Jian He via vinodkv)

    YARN-1290. Let continuous scheduling achieve more balanced task assignment
    (Wei Yan via Sandy Ryza)

    YARN-786. Expose application resource usage in RM REST API (Sandy Ryza)

    YARN-1323. Set HTTPS webapp address along with other RPC addresses in HAUtil
    (Karthik Kambatla via Sandy Ryza)

    YARN-1121. Changed ResourceManager's state-store to drain all events on
    shut-down. (Jian He via vinodkv)

    YARN-1387. RMWebServices should use ClientRMService for filtering
    applications (Karthik Kambatla via Sandy Ryza)

    YARN-1222. Make improvements in ZKRMStateStore for fencing (Karthik
    Kambatla via bikas)

    YARN-709. Added tests to verify validity of delegation tokens and logging of
    appsummary after RM restart. (Jian He via vinodkv)

    YARN-1210. Changed RM to start new app-attempts on RM restart only after
    ensuring that previous AM exited or after expiry time. (Omkar Vinit Joshi via
    vinodkv)

    YARN-674. Fixed ResourceManager to renew DelegationTokens on submission
    asynchronously to work around potential slowness in state-store. (Omkar Vinit
    Joshi via vinodkv)

    YARN-584. In scheduler web UIs, queues unexpand on refresh. (Harshit
    Daga via Sandy Ryza)

    YARN-1303. Fixed DistributedShell to not fail with multiple commands separated
    by a semi-colon as shell-command. (Xuan Gong via vinodkv)

    YARN-1423. Support queue placement by secondary group in the Fair Scheduler
    (Ted Malaska via Sandy Ryza)

    YARN-1314. Fixed DistributedShell to not fail with multiple arguments for a
    shell command separated by spaces. (Xuan Gong via vinodkv)

    YARN-1239. Modified ResourceManager state-store implementations to start
    storing version numbers. (Jian He via vinodkv)

    YARN-1241. In Fair Scheduler, maxRunningApps does not work for non-leaf
    queues. (Sandy Ryza)

    YARN-1318. Promoted AdminService to an Always-On service and merged it into
    RMHAProtocolService. (Karthik Kambatla via vinodkv)

    YARN-1332. In TestAMRMClient, replace assertTrue with assertEquals where
    possible (Sebastian Wong via Sandy Ryza)

    YARN-1403. Separate out configuration loading from QueueManager in the Fair
    Scheduler (Sandy Ryza)

    YARN-1181. Augment MiniYARNCluster to support HA mode (Karthik Kambatla)

    YARN-546. Allow disabling the Fair Scheduler event log (Sandy Ryza)

    YARN-807. When querying apps by queue, iterating over all apps is
    inefficient and limiting (Sandy Ryza)

    YARN-1378. Implemented a cleaner of old finished applications from the RM
    state-store. (Jian He via vinodkv)

    YARN-1481. Move internal services logic from AdminService to ResourceManager.
    (vinodkv via kasha)

    YARN-1491. Upgrade JUnit3 TestCase to JUnit 4 (Chen He via jeagles)

    YARN-408. Change CapacityScheduler to not disable delay-scheduling by default.
    (Mayank Bansal via vinodkv)

    YARN-1325. Modified RM HA configuration validation to also ensure that
    multiple RMs are configured. (Xuan Gong via vinodkv)

    YARN-1311. Fixed app specific scheduler-events' names to be app-attempt
    based. (vinodkv via jianhe)

    YARN-1485. Modified RM HA configuration validation to also ensure that
    service-address configuration are configured for every RM. (Xuan Gong via
    vinodkv)

    YARN-1435. Modified Distributed Shell to accept either the command or the
    custom script. (Xuan Gong via zjshen)

    YARN-1446. Changed client API to retry killing application till RM
    acknowledges so as to account for RM crashes/failover. (Jian He via vinodkv)

    YARN-1307. Redesign znode structure for Zookeeper based RM state-store for
    better organization and scalability. (Tsuyoshi OZAWA via vinodkv)

    YARN-1172. Convert SecretManagers in RM to services (Tsuyoshi OZAWA via kasha)

    YARN-1523. Use StandbyException instead of RMNotYetReadyException (kasha)

    YARN-1541. Changed ResourceManager to invalidate ApplicationMaster host/port
    information once an AM crashes. (Jian He via vinodkv)

    YARN-1482. Modified WebApplicationProxy to make it work across ResourceManager
    fail-over. (Xuan Gong via vinodkv)

    YARN-1568. Rename clusterid to clusterId in ActiveRMInfoProto (kasha)

    YARN-1579. ActiveRMInfoProto fields should be optional (kasha)

    YARN-888. Cleaned up POM files so that non-leaf modules don't include any
    dependencies and thus compact the dependency list for leaf modules.
    (Alejandro Abdelnur via vinodkv)

    YARN-1567. In Fair Scheduler, allow empty queues to change between leaf and
    parent on allocation file reload (Sandy Ryza)

    YARN-1616. RMFatalEventDispatcher should log the cause of the event (kasha)

    YARN-1624. QueuePlacementPolicy format is not easily readable via a JAXB
    parser (Aditya Acharya via Sandy Ryza)

    YARN-1623. Include queue name in RegisterApplicationMasterResponse (Sandy
    Ryza)

    YARN-1573. ZK store should use a private password for root-node-acls. 
    (kasha).

  OPTIMIZATIONS

  BUG FIXES

    YARN-1284. LCE: Race condition leaves dangling cgroups entries for killed
    containers. (Alejandro Abdelnur via Sandy Ryza)

    YARN-1283. Fixed RM to give a fully-qualified proxy URL for an application
    so that clients don't need to do scheme-mangling. (Omkar Vinit Joshi via
    vinodkv)

    YARN-879. Fixed tests w.r.t o.a.h.y.server.resourcemanager.Application.
    (Junping Du via devaraj)

    YARN-1265. Fair Scheduler chokes on unhealthy node reconnect (Sandy Ryza)

    YARN-1044. used/min/max resources do not display info in the scheduler page
    (Sangjin Lee via Sandy Ryza)

    YARN-1259. In Fair Scheduler web UI, queue num pending and num active apps
    switched. (Robert Kanter via Sandy Ryza)

    YARN-1295. In UnixLocalWrapperScriptBuilder, using bash -c can cause Text
    file busy errors (Sandy Ryza)

    YARN-1185. Fixed FileSystemRMStateStore to not leave partial files that
    prevent subsequent ResourceManager recovery. (Omkar Vinit Joshi via vinodkv)

    YARN-1331. yarn.cmd exits with NoClassDefFoundError trying to run rmadmin or
    logs. (cnauroth)

    YARN-1330. Fair Scheduler: defaultQueueSchedulingPolicy does not take effect
    (Sandy Ryza)
    
    YARN-1022. Unnecessary INFO logs in AMRMClientAsync (haosdent via bikas)
    
    YARN-1349. yarn.cmd does not support passthrough to any arbitrary class.
    (cnauroth)
    
    YARN-1357. TestContainerLaunch.testContainerEnvVariables fails on Windows.
    (Chuan Liu via cnauroth)

    YARN-1358. TestYarnCLI fails on Windows due to line endings. (Chuan Liu via
    cnauroth)

    YARN-1343. NodeManagers additions/restarts are not reported as node updates 
    in AllocateResponse responses to AMs. (tucu)

    YARN-1381. Same relaxLocality appears twice in exception message of
    AMRMClientImpl#checkLocalityRelaxationConflict() (Ted Yu via Sandy Ryza)

    YARN-1407. RM Web UI and REST APIs should uniformly use
    YarnApplicationState (Sandy Ryza)

    YARN-1438. Ensure container diagnostics includes exception from container
    launch. (stevel via acmurthy)

    YARN-1138. yarn.application.classpath is set to point to $HADOOP_CONF_DIR
    etc., which does not work on Windows. (Chuan Liu via cnauroth)

    YARN-461. Fair scheduler should not accept apps with empty string queue name. 
    (ywskycn via tucu)

    YARN-1060. Two tests in TestFairScheduler are missing @Test annotation
    (Niranjan Singh via Sandy Ryza)

    YARN-1188. The context of QueueMetrics becomes default when using
    FairScheduler (Tsuyoshi Ozawa via Sandy Ryza)

    YARN-1268. TestFairScheduler.testContinuousScheduling is flaky (Sandy Ryza)

    YARN-1300. SLS tests fail because conf puts YARN properties in
    fair-scheduler.xml (Ted Yu via Sandy Ryza)

    YARN-1183. MiniYARNCluster shutdown takes several minutes intermittently
    (Andrey Klochkov via jeagles)

    YARN-1305. RMHAProtocolService#serviceInit should handle HAUtil's
    IllegalArgumentException (Tsuyoshi Ozawa via bikas)

    YARN-1374. Changed ResourceManager to start the preemption policy monitors
    as active services. (Karthik Kambatla via vinodkv)

    YARN-1395. Distributed shell application master launched with debug flag can
    hang waiting for external ls process. (cnauroth)

    YARN-1400. yarn.cmd uses HADOOP_RESOURCEMANAGER_OPTS. Should be
    YARN_RESOURCEMANAGER_OPTS. (Raja Aluri via cnauroth)

    YARN-1401. With zero sleep-delay-before-sigkill.ms, no signal is ever sent
    (Gera Shegalov via Sandy Ryza)

    YARN-1411. HA config shouldn't affect NodeManager RPC addresses (Karthik
    Kambatla via bikas)

    YARN-1419. TestFifoScheduler.testAppAttemptMetrics fails intermittently
    under jdk7 (Jonathan Eagles via jlowe)

    YARN-744. Race condition in ApplicationMasterService.allocate .. It might
    process same allocate request twice resulting in additional containers
    getting allocated. (Omkar Vinit Joshi via bikas)

    YARN-1425. TestRMRestart fails because MockRM.waitForState(AttemptId) uses
    current attempt instead of the attempt passed as argument (Omkar Vinit
    Joshi via bikas)

    YARN-1053. Diagnostic message from ContainerExitEvent is ignored in
    ContainerImpl (Omkar Vinit Joshi via bikas)

    YARN-1320. Fixed Distributed Shell application to respect custom log4j
    properties file. (Xuan Gong via vinodkv)

    YARN-1416. Fixed a few invalid transitions in RMApp, RMAppAttempt and in some
    tests. (Jian He via vinodkv)

    YARN-895. Changed RM state-store to not crash immediately if RM restarts while
    the state-store is down. (Jian He via vinodkv)

    YARN-1454. Fixed test failure issue with TestRMRestart. (Karthik Kambatla
    via vinodkv)

    YARN-1450. Fixed test failure in TestUnmanagedAMLauncher by removing its
    dependency on distributed-shell. (Binglin Chang via vinodkv)

    YARN-1405. Fixed ResourceManager to not hang when init/start fails with an
    exception w.r.t state-store. (Jian He via vinodkv)

    YARN-1505. Fixed Webapplication proxy server to not hardcode its bind
    address. (Xuan Gong via vinodkv)

    YARN-1145. Fixed a potential file-handle leak in the web interface for
    displaying aggregated logs. (Rohith Sharma via vinodkv)

    YARN-1451. TestResourceManager relies on the scheduler assigning multiple
    containers in a single node update. (Sandy Ryza via kasha)

    YARN-1527. Fix yarn rmadmin command to print the correct usage info.
    (Akira AJISAKA via jianhe)

    YARN-1522. Fixed a race condition in the test TestApplicationCleanup that was
    causing it to randomly fail. (Liyin Liang via vinodkv)

    YARN-1549. Fixed a bug in ResourceManager's ApplicationMasterService that
    was causing unamanged AMs to not finish correctly. (haosdent via vinodkv)

    YARN-1559. Race between ServerRMProxy and ClientRMProxy setting 
    RMProxy#INSTANCE. (kasha and vinodkv via kasha)

    YARN-1560. Fixed TestYarnClient#testAMMRTokens failure with null AMRM token.
    (Ted Yu via jianhe)

    YARN-1409. NonAggregatingLogHandler can throw RejectedExecutionException
    (Tsuyoshi OZAWA via jlowe)

    YARN-1293. Fixed TestContainerLaunch#testInvalidEnvSyntaxDiagnostics failure
    caused by non-English system locale. (Tsuyoshi OZAWA via jianhe)

    YARN-1574. RMDispatcher should be reset on transition to standby. (Xuan Gong
    via kasha)

    YARN-1598. HA-related rmadmin commands don't work on a secure cluster (kasha)

    YARN-1603. Remove two *.orig files which were unexpectedly committed. 
    (Zhijie Shen via junping_du)

    YARN-1601. 3rd party JARs are missing from hadoop-dist output. (tucu)

    YARN-1351. Invalid string format in Fair Scheduler log warn message
    (Konstantin Weitz via Sandy Ryza)

    YARN-1608. LinuxContainerExecutor has a few DEBUG messages at INFO level
    (kasha)

    YARN-1606. Fix the default value of yarn.resourcemanager.zk-timeout-ms 
    in yarn-default.xml (kasha)

    YARN-1607. TestRM relies on the scheduler assigning multiple containers in
    a single node update (Sandy Ryza)

    YARN-1575. Public localizer crashes with "Localized unkown resource"
    (jlowe)

    YARN-1629. IndexOutOfBoundsException in MaxRunningAppsEnforcer (Sandy Ryza)

    YARN-1628. Fixed the test failure in TestContainerManagerSecurity. (Vinod
    Kumar Vavilapalli via zjshen)

Release 2.2.0 - 2013-10-13

  INCOMPATIBLE CHANGES
  
    YARN-1229. Define constraints on Auxiliary Service names. Change
    ShuffleHandler service name from mapreduce.shuffle to
    mapreduce_shuffle (Xuan Gong via sseth)

  NEW FEATURES

  IMPROVEMENTS

    YARN-1246. Added application finish-status to ApplicationSummary for the sake
    of testing given ApplicationHistoryServer is not yet ready. (Arpit Gupta via
    vinodkv)

    YARN-899. Added back queue level administrator-acls so that there is no
    regression w.r.t 1.x. (Xuan Gong via vinodkv)

    YARN-1228. Clean up Fair Scheduler configuration loading. (Sandy Ryza)

    YARN-1213. Restore config to ban submitting to undeclared pools in the
    Fair Scheduler. (Sandy Ryza)

    YARN-1277. Added a policy based configuration for http/https in common
    HttpServer and using the same in YARN - related to per project https config
    support via HADOOP-10022. (Suresh Srinivas and Omkar Vinit Joshi via vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    YARN-1128. FifoPolicy.computeShares throws NPE on empty list of Schedulables
    (Karthik Kambatla via Sandy Ryza)

    YARN-1214. Register ClientToken MasterKey in SecretManager after it is
    saved (Jian He via bikas)

    YARN-49. Improve distributed shell application to work on a secure cluster.
    (Vinod Kumar Vavilapalli via hitesh)

    YARN-1157. Fixed ResourceManager UI to behave correctly when apps like
    distributed-shell do not set tracking urls. (Xuan Gong via vinodkv)

    YARN-1221. With Fair Scheduler, reserved MB reported in RM web UI increases
    indefinitely (Siqi Li via Sandy Ryza)

    YARN-1247. test-container-executor has gotten out of sync with the changes to
    container-executor. (rvs via tucu)

    YARN-1070. Fixed race conditions in NodeManager during container-kill.
    (Zhijie Shen via vinodkv)

    YARN-1215. Yarn URL should include userinfo. (Chuan Liu via cnauroth)

    YARN-1262. TestApplicationCleanup relies on all containers assigned in a
    single heartbeat (Karthik Kambatla via Sandy Ryza)

    YARN-1260. Added webapp.http.address to yarn-default.xml so that default
    install with https enabled doesn't have broken link on NM UI. (Omkar Vinit
    Joshi via vinodkv)

    YARN-1141. Updating resource requests should be decoupled with updating
    blacklist (Zhijie Shen via bikas)

    YARN-876. Node resource is added twice when node comes back from unhealthy
    to healthy. (Peng Zhang via Sandy Ryza)

    YARN-890. Ensure CapacityScheduler doesn't round-up metric for available 
    resources. (Xuan Gong & Hitesh Shah via acmurthy)

    YARN-621. Changed YARN web app to not add paths that can cause duplicate
    additions of authenticated filters there by causing kerberos replay errors.
    (Omkar Vinit Joshi via vinodkv)

    YARN-1236. FairScheduler setting queue name in RMApp is not working.
    (Sandy Ryza)

    YARN-1256. NM silently ignores non-existent service in
    StartContainerRequest (Xuan Gong via bikas)

    YARN-1149. NM throws InvalidStateTransitonException: Invalid event:
    APPLICATION_LOG_HANDLING_FINISHED at RUNNING (Xuan Gong via hitesh)

    YARN-1271. "Text file busy" errors launching containers again
    (Sandy Ryza)

    YARN-1131. $yarn logs command should return an appropriate error message if
    YARN application is still running. (Siddharth Seth via hitesh)

    YARN-1219. FSDownload changes file suffix making FileUtil.unTar() throw
    exception. (Shanyu Zhao via cnauroth)

    YARN-1251. TestDistributedShell#TestDSShell failed with timeout. (Xuan Gong
    via hitesh)

    YARN-1167. Fixed Distributed Shell to not incorrectly show empty hostname
    on RM UI. (Xuan Gong via vinodkv)

    YARN-1254. Fixed NodeManager to not pollute container's credentials. (Omkar
    Vinit Joshi via vinodkv)

    YARN-1273. Fixed Distributed-shell to account for containers that failed
    to start. (Hitesh Shah via vinodkv)

    YARN-1032. Fixed NPE in RackResolver. (Lohit Vijayarenu via acmurthy)

    YARN-1090. Fixed CS UI to better reflect applications as non-schedulable
    and not as pending. (Jian He via acmurthy)

    YARN-1274. Fixed NodeManager's LinuxContainerExecutor to create user, app-dir
    and log-dirs correctly even when there are no resources to localize for the
    container. (Siddharth Seth via vinodkv)

    YARN-1278. Fixed NodeManager to not delete local resources for apps on resync
    command from RM - a bug caused by YARN-1149. (Hitesh Shah via vinodkv)

    YARN-1463. Tests should avoid starting http-server where possible or creates 
    spnego keytab/principals (vinodkv via kasha)

Release 2.1.1-beta - 2013-09-23

  INCOMPATIBLE CHANGES

    YARN-707. Added user information also in the YARN ClientToken so that AMs
    can implement authorization based on incoming users. (Jason Lowe via vinodkv)

    YARN-1170. YARN & MapReduce proto definitions fixed to specify protobuf
    package as hadoop.yarn and hadoop.mapreduce respectively. (Binglin Chang
    via acmurthy)

  NEW FEATURES

  IMPROVEMENTS

    YARN-589. Expose a REST API for monitoring the fair scheduler (Sandy Ryza).

    YARN-1074. Cleaned up YARN CLI application list to only display running
    applications by default. (Xuan Gong via vinodkv)
    
    YARN-1093. Corrections to Fair Scheduler documentation (Wing Yew Poon via
    Sandy Ryza)

    YARN-942. In Fair Scheduler documentation, inconsistency on which
    properties have prefix (Akira Ajisaka via Sandy Ryza)

    YARN-1083. Changed ResourceManager to fail when the expiry interval is less
    than the configured node-heartbeat interval. (Zhijie Shen via vinodkv)

    YARN-1081. Made a trivial change to YARN node CLI header to avoid potential
    confusion. (Akira AJISAKA via vinodkv)

    YARN-1034. Remove "experimental" in the Fair Scheduler documentation.
    (Karthik Kambatla via Sandy Ryza)

    YARN-1080. Improved help message for "yarn logs" command. (Xuan Gong via
    vinodkv)

    YARN-771. AMRMClient support for resource blacklisting (Junping Du via
    bikas)

    YARN-1117. Improved help messages for "yarn application" and "yarn node"
    commands. (Xuan Gong via vinodkv)

    YARN-1120. Made ApplicationConstants.Environment.USER definition OS neutral
    as the corresponding value is now set correctly end-to-end. (Chuan Liu via
    vinodkv)

    YARN-1124. Modified YARN CLI application list to display new and submitted
    applications together with running apps by default, following up YARN-1074.
    (Xuan Gong via vinodkv)

    YARN-1065. NM should provide AuxillaryService data to the container (Xuan
    Gong via bikas)

    YARN-758. Augment MockNM to use multiple cores (Karthik Kambatla via
    Sandy Ryza)

    YARN-696. Changed RMWebservice apps call to take in multiple application
    states. (Trevor Lorimer via vinodkv)

    YARN-910. Augmented auxiliary services to listen for container starts and
    completions in addition to application events. (Alejandro Abdelnur via
    vinodkv)

    YARN-1137. Add support whitelist for system users to Yarn 
    container-executor.c. (rvs via tucu)

    YARN-1001. Added a web-service to get statistics about per application-type
    per state for consumption by downstream projects. (Zhijie Shen via vinodkv)

    YARN-1203. Changed YARN web-app proxy to handle http and https URLs from
    AM registration and finish correctly. (Omkar Vinit Joshi via vinodkv)

    YARN-1204. Added separate configuration properties for https for RM and NM
    without which servers enabled with https will also start on http ports.
    (Omkar Vinit Joshi via vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    YARN-948. Changed ResourceManager to validate the release container list
    before actually releasing them. (Omkar Vinit Joshi via vinodkv)

    YARN-966. Fixed ContainerLaunch to not fail quietly when there are no
    localized resources due to some other failure. (Zhijie Shen via vinodkv)

    YARN-502. Fixed a state machine issue with RMNode inside ResourceManager
    which was crashing scheduler. (Mayank Bansal via vinodkv)

    YARN-573. Shared data structures in Public Localizer and Private Localizer
    are not Thread safe. (Omkar Vinit Joshi via jlowe)

    YARN-903. Changed ContainerManager to suppress unnecessary warnings when
    stopping already stopped containers. (Omkar Vinit Joshi via vinodkv)

    YARN-906. Fixed a bug in NodeManager where cancelling ContainerLaunch at
    KILLING state causes that the container to hang. (Zhijie Shen via vinodkv)

    YARN-994. HeartBeat thread in AMRMClientAsync does not handle runtime
    exception correctly (Xuan Gong via bikas)

    YARN-337. RM handles killed application tracking URL poorly (jlowe)

    YARN-107. Fixed ResourceManager and clients to better handle
    forceKillApplication on non-running and finished applications. (Xuan Gong
    via vinodkv)

    YARN-643. Fixed ResourceManager to remove all tokens consistently on app
    finish. (Xuan Gong via vinodkv)

    YARN-1006. Fixed broken rendering in the Nodes list web page on the RM web
    UI. (Xuan Gong via vinodkv)

    YARN-881. Priority#compareTo method seems to be wrong. (Jian He via bikas)

    YARN-1082. Create base directories on HDFS after RM login to ensure RM
    recovery doesn't fail in secure mode. (vinodkv via acmurthy)

    YARN-1085. Modified YARN and MR2 web-apps to do HTTP authentication in
    secure setup with kerberos. (Omkar Vinit Joshi via vinodkv)

    YARN-1094. Fixed a blocker with RM restart code because of which RM crashes
    when try to recover an existing app. (vinodkv)

    YARN-1008. MiniYARNCluster with multiple nodemanagers, all nodes have same 
    key for allocations. (tucu)

    YARN-981. Fixed YARN webapp so that /logs servlet works like before. (Jian He
    via vinodkv)

    YARN-602. Fixed NodeManager to not let users override some mandatory 
    environmental variables. (Kenji Kikushima  via vinodkv)

    YARN-1101. Active nodes can be decremented below 0 (Robert Parker 
    via tgraves)

    YARN-1077. Fixed TestContainerLaunch test failure on Windows. (Chuan Liu via
    vinodkv)

    YARN-957. Fixed a bug in CapacityScheduler because of which requests that
    need more than a node's total capability were incorrectly allocated on that
    node causing apps to hang. (Omkar Vinit Joshi via vinodkv)

    YARN-1107. Fixed a bug in ResourceManager because of which RM in secure mode
    fails to restart. (Omkar Vinit Joshi via vinodkv)

    YARN-1049. ContainerExistStatus should define a status for preempted 
    containers. (tucu)

    YARN-1144. Unmanaged AMs registering a tracking URI should not be 
    proxy-fied. (tucu)

    YARN-1152. Fixed a bug in ResourceManager that was causing clients to get
    invalid client token key errors when an appliation is about to finish.
    (Jason Lowe via vinodkv)

    YARN-292. Fixed FifoScheduler and FairScheduler to make their applications
    data structures thread safe to avoid RM crashing with
    ArrayIndexOutOfBoundsException. (Zhijie Shen via vinodkv)

    YARN-1025. ResourceManager and NodeManager do not load native libraries on
    Windows. (cnauroth)

    YARN-1176. RM web services ClusterMetricsInfo total nodes doesn't include 
    unhealthy nodes (Jonathan Eagles via tgraves)

    YARN-1078. TestNodeManagerResync, TestNodeManagerShutdown, and
    TestNodeStatusUpdater fail on Windows. (Chuan Liu via cnauroth)

    YARN-1194. TestContainerLogsPage fails with native builds (Roman Shaposhnik
    via jlowe)

    YARN-1116. Populate AMRMTokens back to AMRMTokenSecretManager after RM
    restarts (Jian He via bikas)

    YARN-1189. NMTokenSecretManagerInNM is not being told when applications
    have finished (Omkar Vinit Joshi via jlowe)

    YARN-540. Race condition causing RM to potentially relaunch already
    unregistered AMs on RM restart (Jian He via bikas)

    YARN-1184. ClassCastException during preemption enforcement. (cdouglas)

Release 2.1.0-beta - 2013-08-22

  INCOMPATIBLE CHANGES

    YARN-396. Rationalize AllocateResponse in RM Scheduler API. (Zhijie Shen
    via hitesh)

    YARN-439. Flatten NodeHeartbeatResponse. (Xuan Gong via sseth)

    YARN-440. Flatten RegisterNodeManagerResponse. (Xuan Gong via sseth)

    YARN-536. Removed the unused objects ContainerStatus and ContainerStatus from
    Container which also don't belong to the container. (Xuan Gong via vinodkv)

    YARN-486. Changed NM's startContainer API to accept Container record given by
    RM as a direct parameter instead of as part of the ContainerLaunchContext
    record. (Xuan Gong via vinodkv)

    YARN-444. Moved special container exit codes from YarnConfiguration to API
    where they belong. (Sandy Ryza via vinodkv)

    YARN-441. Removed unused utility methods for collections from two API
    records. (Xuan Gong via vinodkv)

    YARN-561. Modified NodeManager to set key information into the environment
    of every container that it launches. (Xuan Gong via vinodkv)

    YARN-579. Stop setting the Application Token in the AppMaster env, in
    favour of the copy present in the container token field. 
    (Vinod Kumar Vavilapalli via sseth)

    YARN-629. Make YarnRemoteException not be rooted at IOException. (Xuan Gong
    via vinodkv)

    YARN-633. Changed RMAdminProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-632. Changed ContainerManager api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-631. Changed ClientRMProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-630. Changed AMRMProtocol api to throw IOException and
    YarnRemoteException. (Xuan Gong via vinodkv)

    YARN-615. Rename ContainerLaunchContext.containerTokens to tokens.
    (Vinod Kumar Vavilapalli via sseth)

    YARN-571. Remove user from ContainerLaunchContext. (Omkar Vinit Joshi via
    vinodkv)

    YARN-716. Making ApplicationID immutable. (Siddharth Seth via vinodkv)

    YARN-684. ContainerManager.startContainer should use
    ContainerTokenIdentifier instead of the entire Container.
    (Vinod Kumar Vavilapalli via sseth)

    YARN-735. Make ApplicationAttemptId, ContaienrId and NodeId immutable.
    (Jian He via sseth)

    YARN-749. Rename ResourceRequest.(get,set)HostName to
    ResourceRequest.(get,set)ResourceName. (acmurthy)

    YARN-720. container-log4j.properties should not refer to mapreduce
    property names. (Zhijie Shen via sseth)

    YARN-748. Moved BuilderUtils from yarn-common to yarn-server-common for
    eventual retirement. (Jian He via vinodkv)

    YARN-635. Renamed YarnRemoteException to YarnException. (Siddharth Seth via
    vinodkv)

    YARN-755. Renamed AllocateResponse.reboot to AllocateResponse.resync. (Bikas
    Saha via vinodkv)

    YARN-753. Added individual factory methods for all api protocol records and
    converted the records to be abstract classes. (Jian He via vinodkv)

    YARN-724. Moved ProtoBase from api.records to api.records.impl.pb. (Jian He
    via vinodkv)

    YARN-759. Create Command enum in AllocateResponse (bikas)

    YARN-777. Removed unreferenced objects from .proto files. (Jian He via
    vinodkv) 

    YARN-642. Removed health parameter from ResourceManager /nodes web-service
    and cleaned the behaviour of the status parameter. (Sandy Ryza vid vinodkv)

    YARN-530. Defined Service model strictly, implemented AbstractService for
    robust subclassing and migrated yarn-common services. (Steve Loughran via
    vinodkv)

    YARN-746. Renamed Service.register() and Service.unregister() to
    registerServiceListener() & unregisterServiceListener() respectively.
    (Steve Loughran via vinodkv)

    YARN-792. Moved NodeHealthStatus from yarn.api.record to
    yarn.server.api.record. (Jian He via vinodkv)

    YARN-806. Moved ContainerExitStatus from yarn.api to yarn.api.records. (Jian
    He via vinodkv)

    YARN-821. Renamed setFinishApplicationStatus to setFinalApplicationStatus in
    FinishApplicationMasterRequest for consistency. (Jian He via vinodkv)

    YARN-787. Removed minimum resource from RegisterApplicationMasterResponse.
    (tucu via acmurthy)

    YARN-829. Renamed RMTokenSelector to be RMDelegationTokenSelector. (Zhijie
    Shen via vinodkv)

    YARN-828. Removed the unsed YarnVersionAnnotation. (Zhijie Shen via vinodkv)

    YARN-823. Moved RMAdmin from yarn.client to yarn.client.cli and renamed it to
    be RMAdminCLI. (Jian He via vinodkv)

    YARN-387. Renamed YARN protocols for consistency.
    ClientRMProtocol -> ApplicationClientProtocol
    AMRMProtocol -> ApplicationMasterProtocol
    ContainerManager -> ContainerManagementProtocol
    (vinodkv via acmurthy)

    YARN-831. Removed minimum resource from GetNewApplicationResponse as a
    follow-up to YARN-787. (Jian He via acmurthy)

    YARN-824. Added static factory methods to hadoop-yarn-client interfaces. 
    (Jian He via acmurthy)

    YARN-826. Moved Clock and SystemClock into yarn.util package. (Zhijie Shen
    via vinodkv)

    YARN-837. Moved yarn.ClusterInfo into MapReduce project as it doesn't belong
    to YARN. (Zhijie Shen via vinodkv)

    YARN-822. Renamed ApplicationToken to be AMRMToken, and similarly the
    corresponding TokenSelector and SecretManager. (Omkar Vinit Joshi via vinodkv)

    YARN-610. ClientToken is no longer set in the environment of the Containers.
    (Omkar Vinit Joshi via vinodkv)

    YARN-834. Fixed annotations for yarn-client module, reorganized packages and
    clearly differentiated *Async apis. (Arun C Murthy and Zhijie Shen via
    vinodkv)

    YARN-840. Moved ProtoUtils to yarn.api.records.pb.impl. (Jian He via
    acmurthy) 

    YARN-841. Move Auxiliary service to yarn-api, annotate and document it.
    (vinodkv)

    YARN-850. Rename getClusterAvailableResources to getAvailableResources in
    AMRMClients (Jian He via bikas)

    YARN-694. Starting to use NMTokens to authenticate all communication with
    NodeManagers. (Omkar Vinit Joshi via vinodkv) 

    YARN-553. Replaced YarnClient.getNewApplication with
    YarnClient.createApplication which provides a directly usable
    ApplicationSubmissionContext to simplify the api. (Karthik Kambatla via
    acmurthy) 

    YARN-851. Share NMTokens using NMTokenCache (api-based) between AMRMClient
    and NMClient instead of memory based approach which is used currently. (Omkar
    Vinit Joshi via vinodkv)

    YARN-869. Move ResourceManagerAdministrationProtocol out of main YARN api.
    (vinodkv via acmurthy)

    YARN-791. Changed RM APIs and web-services related to nodes to ensure that
    both are consistent with each other. (Sandy Ryza via vinodkv)

    YARN-727. ClientRMProtocol.getAllApplications should accept ApplicationType as
    a parameter. (Xuan Gong via hitesh)

    YARN-701. Use application tokens irrespective of secure or non-secure
    mode. (vinodkv via acmurthy)

    YARN-918. Remove ApplicationAttemptId from
    RegisterApplicationMasterRequestProto. (vinodkv via acmurthy)

    YARN-926. Modified ContainerManagerProtcol APIs to take in requests for
    multiple containers. (Jian He via vinodkv)

  NEW FEATURES

    YARN-482. FS: Extend SchedulingMode to intermediate queues. 
    (kkambatl via tucu)

    YARN-45. Add protocol for schedulers to request containers back from
    ApplicationMasters. (Carlo Curino, cdouglas)

    YARN-563. Add the concept of an application-type for each application.
    (Mayank Bansal via vinodkv)

    HADOOP-8562. Enhancements to support Hadoop on Windows Server and Windows
    Azure environments. (See breakdown of tasks below for subtasks and
    contributors)

    YARN-422. Add a NM Client library to help application-writers. (Zhijie Shen
    via vinodkv)

    YARN-392. Make it possible to specify hard locality constraints in resource
    requests. (sandyr via tucu)

    YARN-326. Add multi-resource scheduling to the fair scheduler. 
    (sandyr via tucu)

    YARN-398. Make it possible to specify hard locality constraints in resource
    requests for CapacityScheduler. (acmurthy)

    YARN-781. Exposing LOGDIR in all containers' environment which should be used
    by containers for logging purposes. (Jian He via vinodkv)

  IMPROVEMENTS

    YARN-347. Node CLI should show CPU info besides memory in node status.
    (Junping Du via llu)

    YARN-365. Change NM heartbeat handling to not generate a scheduler event
    on each heartbeat. (Xuan Gong via sseth)

    YARN-380. Fix yarn node -status output to be better readable. (Omkar Vinit
    Joshi via vinodkv)

    YARN-410. Fixed RM UI so that the new lines diagnostics for a failed app on
    the per-application page are translated to html line breaks. (Omkar Vinit
    Joshi via vinodkv)

    YARN-198. Added a link to RM pages from the NodeManager web app. (Jian He
    via vinodkv)

    YARN-237. Refreshing the RM page forgets how many rows I had in my
    Datatables (jian he via bobby)

    YARN-481. Add AM Host and RPC Port to ApplicationCLI Status Output 
    (Chris Riccomini via bikas)

    YARN-297. Improve hashCode implementations for PB records. (Xuan Gong via
    hitesh)

    YARN-417. Create AMRMClient wrapper that provides asynchronous callbacks.
    (Sandy Ryza via bikas)

    YARN-497. Yarn unmanaged-am launcher jar does not define a main class in
    its manifest (Hitesh Shah via bikas)

    YARN-469. Make scheduling mode in FS pluggable. (kkambatl via tucu)

    YARN-450. Define value for * in the scheduling protocol (Zhijie Shen via
    bikas)

    YARN-475. Remove a unused constant in the public API -
    ApplicationConstants.AM_APP_ATTEMPT_ID_ENV. (Hitesh Shah via vinodkv)

    YARN-309. Changed NodeManager to obtain heart-beat interval from the
    ResourceManager. (Xuan Gong via vinodkv)

    YARN-447. Move ApplicationComparator in CapacityScheduler to use comparator
    in ApplicationId. (Nemon Lou via vinodkv)

    YARN-381. Improve fair scheduler docs. (Sandy Ryza via tomwhite)

    YARN-458. YARN daemon addresses must be placed in many different configs. 
    (sandyr via tucu)

    YARN-193. Scheduler.normalizeRequest does not account for allocation
    requests that exceed maximumAllocation limits (Zhijie Shen via bikas)

    YARN-479. NM retry behavior for connection to RM should be similar for
    lost heartbeats (Jian He via bikas)

    YARN-495. Changed NM reboot behaviour to be a simple resync - kill all
    containers  and re-register with RM. (Jian He via vinodkv)

    YARN-514. Delayed store operations should not result in RM unavailability
    for app submission (Zhijie Shen via bikas)

    YARN-586. Fixed a typo in ApplicationSubmissionContext#setApplicationId.
    (Zhijie Shen via vinodkv)

    YARN-542. Changed the default global AM max-attempts value to be not one.
    (Zhijie Shen via vinodkv)

    YARN-583. Moved application level local resources to be localized under the
    filecache sub-directory under application directory. (Omkar Vinit Joshi via
    vinodkv)

    YARN-581. Added a test to verify that app delegation tokens are restored
    after RM restart. (Jian He via vinodkv)

    YARN-577. Add application-progress also to ApplicationReport. (Hitesh Shah
    via vinodkv)

    YARN-595. Refactor fair scheduler to use common Resources. (Sandy Ryza
    via tomwhite)

    YARN-562. Modified NM to reject any containers allocated by a previous
    ResourceManager. (Jian He via vinodkv)

    YARN-591. Moved RM recovery related records out of public API as they do not
    belong there. (vinodkv)

    YARN-599. Refactoring submitApplication in ClientRMService and RMAppManager
    to separate out various validation checks depending on whether they rely on
    RM configuration or not. (Zhijie Shen via vinodkv)

    YARN-618. Modified RM_INVALID_IDENTIFIER to be -1 instead of zero. (Jian He
    via vinodkv)

    YARN-625. Move the utility method unwrapAndThrowException from
    YarnRemoteExceptionPBImpl to RPCUtil. (Siddharth Seth via vinodkv)

    YARN-645. Moved RMDelegationTokenSecretManager from yarn-server-common to
    yarn-server-resourcemanager where it really belongs. (Jian He via vinodkv)

    YARN-651. Changed PBClientImpls of ContainerManager and RMAdmin to throw
    IOExceptions also. (Xuan Gong via vinodkv)

    YARN-582. Changed ResourceManager to recover Application token and client
    tokens for app attempt so that RM can be restarted while preserving current
    applications. (Jian He via vinodkv)

    YARN-568. Add support for work preserving preemption to the FairScheduler.
    (Carlo Curino and Sandy Ryza via cdouglas)

    YARN-598. Add virtual cores to queue metrics. (sandyr via tucu)

    YARN-634. Modified YarnRemoteException to be not backed by PB and introduced
    a separate SerializedException record. (Siddharth Seth via vinodkv)

    YARN-663. Changed ResourceTracker API and LocalizationProtocol API to throw
    YarnRemoteException and IOException. (Xuan Gong via vinodkv)

    YARN-590. Added an optional mesage to be returned by ResourceMaanger when RM
    asks an RM to shutdown/resync etc so that NMs can log this message locally
    for better debuggability. (Mayank Bansal via vinodkv)

    YARN-617. Made ContainerTokens to be used for validation at NodeManager
    also in unsecure mode to prevent AMs from faking resource requirements in
    unsecure mode. (Omkar Vinit Joshi via vinodkv)

    YARN-708. Moved RecordFactory classes to hadoop-yarn-api, and put some
    miscellaneous fixes to the interfaces. (Siddharth Seth via vinodkv)

    YARN-711. Copied BuilderUtil methods in individual API records as
    BuilderUtils is going to be dismantled. (Jian He via vinodkv)

    YARN-714. Added NMTokens to be sent to AMs as part of heart-beat response.
    (Omkar Vinit Joshi via vinodkv)

    YARN-638. Modified ResourceManager to restore RMDelegationTokens after
    restarting. (Jian He via vinodkv)

    YARN-660. Improve AMRMClient with matching requests (bikas)

    YARN-717. Put object creation factories for Token in the class itself and
    remove useless derivations for specific tokens. (Jian He via vinodkv)

    YARN-756. Move Preemption* records to yarn.api where they really belong.
    (Jian He via vinodkv)

    YARN-750. Allow for black-listing resources in YARN API and Impl in CS
    (acmurthy via bikas)

    YARN-877. Support resource blacklisting for FifoScheduler.
    (Junping Du via llu)

    YARN-686. Flatten NodeReport. (sandyr via tucu)

    YARN-737. Throw some specific exceptions directly instead of wrapping them
    in YarnException. (Jian He via sseth)

    YARN-731. RPCUtil.unwrapAndThrowException should unwrap remote
    RuntimeExceptions. (Zhijie Shen via sseth)

    YARN-600. Hook up cgroups CPU settings to the number of virtual cores 
    allocated. (sandyr via tucu)

    YARN-648. FS: Add documentation for pluggable policy. (kkambatl via tucu)

    YARN-773. Moved YarnRuntimeException from package api.yarn to
    api.yarn.exceptions. (Jian He via vinodkv)

    YARN-692. Creating NMToken master key on RM and sharing it with NM as a part
    of RM-NM heartbeat. (Omkar Vinit Joshi via vinodkv)

    YARN-782. vcores-pcores ratio functions differently from vmem-pmem ratio in 
    misleading way. (sandyr via tucu)

    YARN-803. factor out scheduler config validation from the ResourceManager 
    to each scheduler implementation. (tucu)

    YARN-789. Enable zero capabilities resource requests in fair scheduler. 
    (tucu)

    YARN-639. Modified Distributed Shell application to start using the new
    NMClient library. (Zhijie Shen via vinodkv)

    YARN-693. Modified RM to send NMTokens on allocate call so that AMs can then
    use them for authentication with NMs. (Omkar Vinit Joshi via vinodkv)

    YARN-752. In AMRMClient, automatically add corresponding rack requests for 
    requested nodes. (sandyr via tucu)

    YARN-825. Fixed javadoc and annotations for yarn-common module. (vinodkv)

    YARN-833. Moved Graph and VisualizeStateMachine into yarn.state package.
    (Zhijie Shen via vinodkv)

    YARN-805. Fix javadoc and annotations on classes in the yarn-api
    package. (Jian He via sseth)

    YARN-846.  Move pb Impl classes from yarn-api to yarn-common. (Jian He via
    vinodkv)

    YARN-827. Need to make Resource arithmetic methods accessible (Jian He via
    bikas)

    YARN-866. Add test for class ResourceWeights. (ywskycn via tucu)

    YARN-736. Add a multi-resource fair sharing metric. (sandyr via tucu)

    YARN-883. Expose Fair Scheduler-specific queue metrics. (sandyr via tucu)

    YARN-569. Add support for requesting and enforcing preemption requests via
    a capacity monitor. (Carlo Curino, cdouglas)

    YARN-521. Augment AM - RM client module to be able to request containers
    only at specific locations (Sandy Ryza via bikas)

    YARN-513. Create common proxy client for communicating with RM. (Xuan Gong
    & Jian He via bikas)

    YARN-927. Change ContainerRequest to not have more than 1 container count
    and remove StoreContainerRequest (bikas)

    YARN-922. Change FileSystemRMStateStore to use directories (Jian He via
    bikas)

    YARN-865. RM webservices can't query based on application Types. (Xuan Gong
    via hitesh)

    YARN-912. Move client facing exceptions to yarn-api module. (Mayank Bansal
    via vinodkv)

    YARN-84. Use Builder to build RPC server. (Brandon Li via suresh)

    YARN-1046. Disable mem monitoring by default in MiniYARNCluster. (Karthik
    Kambatla via Sandy Ryza)

    YARN-1045. Improve toString implementation for PBImpls. (Jian He via sseth)  

  OPTIMIZATIONS

    YARN-512. Log aggregation root directory check is more expensive than it
    needs to be. (Maysam Yabandeh via jlowe)

    YARN-719. Move RMIdentifier from Container to ContainerTokenIdentifier.
    (Vinod Kumar Vavilapalli via sseth)

  BUG FIXES

    YARN-383. AMRMClientImpl should handle null rmClient in stop()
    (Hitesh Shah via sseth)

    YARN-385. Add missing fields - location and #containers to
    ResourceRequestPBImpl's toString(). (Sandy Ryza via sseth)

    YARN-377. Use the new StringUtils methods added by HADOOP-9252 and fix
    TestContainersMonitor.  (Chris Nauroth via szetszwo)

    YARN-391. Formatting fixes for LCEResourceHandler classes.
    (Steve Loughran via sseth)

    YARN-390. ApplicationCLI and NodeCLI hard-coded platform-specific line
    separator causes test failures on Windows. (Chris Nauroth via suresh)

    YARN-406. Fix TestRackResolver to function in networks where "host1"
    resolves to a valid host. (Hitesh Shah via sseth)

    YARN-376. Fixes a bug which would prevent the NM knowing about completed
    containers and applications. (Jason Lowe via sseth)

    YARN-196. Nodemanager should be more robust in handling connection failure
    to ResourceManager when a cluster is started (Xuan Gong via hitesh)

    YARN-485. TestProcfsProcessTree#testProcessTree() doesn't wait long enough 
    for the process to die. (kkambatl via tucu)
 
    YARN-71. Fix the NodeManager to clean up local-dirs on restart.
    (Xuan Gong via sseth)

    YARN-378. Fix RM to make the AM max attempts/retries to be configurable
    per application by clients. (Zhijie Shen via vinodkv)

    YARN-498. Unmanaged AM launcher does not set various constants in env for
    an AM, also does not handle failed AMs properly. (Hitesh Shah via bikas)

    YARN-496. Fair scheduler configs are refreshed inconsistently in
    reinitialize. (Sandy Ryza via tomwhite)

    YARN-474. Fix CapacityScheduler to trigger application-activation when
    am-resource-percent configuration is refreshed. (Zhijie Shen via vinodkv)

    YARN-209. Fix CapacityScheduler to trigger application-activation when
    the cluster capacity changes. (Zhijie Shen via vinodkv)

    YARN-24. Nodemanager fails to start if log aggregation enabled and 
    namenode unavailable. (sandyr via tucu)

    YARN-515. Node Manager not getting the master key. (Robert Joseph Evans
    via jlowe)

    YARN-382. SchedulerUtils improve way normalizeRequest sets the resource
    capabilities. (Zhijie Shen via bikas)

    YARN-467. Modify public distributed cache to localize files such that no
    local directory hits unix file count limits and thus prevent job failures.
    (Omkar Vinit Joshi via vinodkv)

    YARN-101. Fix NodeManager heartbeat processing to not lose track of completed
    containers in case of dropped heartbeats. (Xuan Gong via vinodkv)

    YARN-538. RM address DNS lookup can cause unnecessary slowness on every JHS 
    page load. (sandyr via tucu)

    YARN-532. Change RMAdmin and Localization client protocol PB implementations
    to implement closeable so that they can be stopped when needed via
    RPC.stopProxy(). (Siddharth Seth via vinodkv)

    YARN-99. Modify private distributed cache to localize files such that no
    local directory hits unix file count limits and thus prevent job failures.
    (Omkar Vinit Joshi via vinodkv)

    YARN-112. Fixed a race condition during localization that fails containers.
    (Omkar Vinit Joshi via vinodkv)

    YARN-534. Change RM restart recovery to also account for AM max-attempts 
    configuration after the restart. (Jian He via vinodkv)

    YARN-539. Addressed memory leak of LocalResource objects NM when a resource
    localization fails. (Omkar Vinit Joshi via vinodkv)

    YARN-319. Submitting a job to a fair scheduler queue for which the user
    does not have permission causes the client to wait forever.
    (shenhong via tomwhite)

    YARN-412. Fixed FifoScheduler to check hostname of a NodeManager rather
    than its host:port during scheduling which caused incorrect locality for
    containers. (Roger Hoover via acmurthy)

    YARN-500. Fixed YARN webapps to not roll-over ports when explicitly asked
    to use non-ephemeral ports. (Kenji Kikushima via vinodkv)

    YARN-518. Fair Scheduler's document link could be added to the hadoop 2.x 
    main doc page. (sandyr via tucu)

    YARN-476. ProcfsBasedProcessTree info message confuses users. 
    (sandyr via tucu)

    YARN-585. Fix failure in TestFairScheduler#testNotAllowSubmitApplication
    caused by YARN-514. (Zhijie Shen via vinodkv)

    YARN-547. Fixed race conditions in public and private resource localization
    which used to cause duplicate downloads. (Omkar Vinit Joshi via vinodkv)

    YARN-594. Update test and add comments in YARN-534 (Jian He via bikas)

    YARN-549. YarnClient.submitApplication should wait for application to be
    accepted by the RM (Zhijie Shen via bikas)

    YARN-605. Fix failing unit test in TestNMWebServices when versionInfo has
    parantheses like when running on a git checkout. (Hitesh Shah via vinodkv)

    YARN-289. Fair scheduler allows reservations that won't fit on node.
    (Sandy Ryza via tomwhite)

    YARN-576. Modified ResourceManager to reject NodeManagers that don't satisy
    minimum resource requirements. (Kenji Kikushima via vinodkv)

    YARN-646. Fix two typos in Fair Scheduler user guide. (Dapeng Sun via atm)

    YARN-507. Add interface visibility and stability annotations to FS 
    interfaces/classes. (kkambatl via tucu)

    YARN-637. FS: maxAssign is not honored. (kkambatl via tucu)

    YARN-655. Fair scheduler metrics should subtract allocated memory from 
    available memory. (sandyr via tucu)

    YARN-628. Fix the way YarnRemoteException is being unrolled to extract out
    the underlying exception. (Siddharth Seth via vinodkv)

    YARN-695. Remove masterContainer and status unused fields from
    ApplicationReportProto and fix bugs in ApplicationReportPBImpl. (Zhijie Shen
    via vinodkv)

    YARN-706. Fixed race conditions in TestFSDownload. (Zhijie Shen via vinodkv).

    YARN-715. Fixed unit test failures - TestDistributedShell and
    TestUnmanagedAMLauncher. (Vinod Kumar Vavilapalli via sseth)

    YARN-578. Fixed NM to use SecureIOUtils for reading and aggregating logs.
    (Omkar Vinit Joshi via vinodkv) 

    YARN-733. Fixed TestNMClient from failing occasionally. (Zhijie Shen via
    vinodkv)

    YARN-730. Fix NMClientAsync to remove completed containers. (Zhijie Shen
    via acmurthy)

    YARN-726. Fix queue & finish time fields in web-ui for ResourceManager.
    (Mayank Bansal via acmurthy) 

    YARN-757. Changed TestRMRestart to use the default scheduler to avoid test
    failures. (Bikas Saha via vinodkv)

    YARN-742. Log aggregation causes a lot of redundant setPermission calls.
    (jlowe via kihwal)

    YARN-764. blank Used Resources on Capacity Scheduler page (Nemon Lou via
    tgraves)

    YARN-761. TestNMClientAsync fails sometimes (Zhijie Shen via bikas)

    YARN-760. NodeManager throws AvroRuntimeException on failed start.
    (Niranjan Singh via jlowe)

    YARN-767. Initialize application metrics at RM bootup. (Jian He via
    acmurthy) 

    YARN-700. TestInfoBlock fails on Windows because of line ending missmatch.
    (Ivan Mitic via cnauroth)

    YARN-117. Migrated rest of YARN to the new service model. (Steve Louhran via
    vinodkv)

    YARN-812. Set default logger for application summary logger to
    hadoop.root.logger. (sseth via acmurthy)

    YARN-848. Nodemanager does not register with RM using the fully qualified
    hostname. (Hitesh Shah via sseth)

    YARN-854. Fixing YARN bugs that are failing applications in secure
    environment. (Omkar Vinit Joshi via vinodkv)

    YARN-861. TestContainerManager is failing. (Vinod Kumar Vavilapalli via
    hitesh)

    YARN-874. Making common RPC to switch to not switch to simple when other
    mechanisms are enabled and thus fix YARN/MR test failures after HADOOP-9421.
    (Daryn Sharp and Vinod Kumar Vavilapalli via vinodkv)

    YARN-845. RM crash with NPE on NODE_UPDATE (Mayank Bansal via bikas)

    YARN-369. Handle ( or throw a proper error when receiving) status updates
    from application masters that have not registered (Mayank Bansal &
    Abhishek Kapoor via bikas)

    YARN-541. getAllocatedContainers() is not returning all the allocated
    containers (bikas)

    YARN-763. AMRMClientAsync should stop heartbeating after receiving
    shutdown from RM (Xuan Gong via bikas)

    YARN-654. AMRMClient: Perform sanity checks for parameters of public
    methods (Xuan Gong via bikas)"

    YARN-919. Document setting default heap sizes in yarn-env.sh (Mayank
    Bansal via hitesh)

    YARN-795. Fair scheduler queue metrics should subtract allocated vCores from 
    available vCores. (ywskycn via tucu) 

    YARN-799. Fix CgroupsLCEResourcesHandler to use /tasks instead of
    /cgroup.procs. (Chris Riccomini via acmurthy) 

    YARN-333. Schedulers cannot control the queue-name of an 
    application. (sandyr via tucu)

    YARN-368. Fixed a typo in error message in Auxiliary services. (Albert Chu
    via vinodkv)

    YARN-295. Fixed a race condition in ResourceManager RMAppAttempt state
    machine. (Mayank Bansal via vinodkv)

    YARN-523. Modified a test-case to validate container diagnostics on
    localization failures. (Jian He via vinodkv)

    YARN-661. Fixed NM to cleanup users' local directories correctly when
    starting up. (Omkar Vinit Joshi via vinodkv)

    YARN-820. Fixed an invalid state transition in NodeManager caused by failing
    resource localization. (Mayank Bansal via vinodkv)

    YARN-62. Modified NodeManagers to avoid AMs from abusing container tokens for
    repetitive container launches. (Omkar Vinit Joshi via vinodkv)

    YARN-814. Improving diagnostics when containers fail during launch due to
    various reasons like invalid env etc. (Jian He via vinodkv)

    YARN-897. Ensure child queues are ordered correctly to account for
    completed containers. (Djellel Eddine Difallah via acmurthy)

    YARN-853. Fixed CapacityScheduler's maximum-am-resource-percent to properly
    work beyond refreshing queues. (Devaraj K via vinodkv)

    YARN-873. YARNClient.getApplicationReport(unknownAppId) returns a null
    report (Xuan Gong via bikas)

    YARN-875. Application can hang if AMRMClientAsync callback thread has
    exception (Xuan Gong via bikas)

    YARN-968. RM admin commands don't work. (vinodkv via kihwal)

    YARN-688. Fixed NodeManager to properly cleanup containers when it is shut
    down. (Jian He via vinodkv)

    YARN-960. Fixed ResourceManager to propagate client-submitted credentials
    irrespective of security. (Daryn Sharp via vinodkv)

    YARN-937. Fix unmanaged AM in non-secure/secure setup post YARN-701. (tucu)

    YARN-932. TestResourceLocalizationService.testLocalizationInit can fail on
    JDK7. (Karthik Kambatla via Sandy Ryza)

    YARN-961. Changed ContainerManager to enforce Token auth irrespective of
    security. (Omkar Vinit Joshi via vinodkv)

    YARN-945. Removed setting of AMRMToken's service from ResourceManager
    and changed client libraries do it all the time and correctly. (vinodkv)

    YARN-656. In scheduler UI, including reserved memory in Memory Total can 
    make it exceed cluster capacity. (Sandy Ryza)

  BREAKDOWN OF HADOOP-8562/YARN-191 SUBTASKS AND RELATED JIRAS

    YARN-158. Yarn creating package-info.java must not depend on sh.
    (Chris Nauroth via suresh)

    YARN-176. Some YARN tests fail to find winutils. (Chris Nauroth via suresh)
    
    YARN-207. YARN distribution build fails on Windows. (Chris Nauroth via
    suresh)

    YARN-199. Yarn cmd line scripts for windows. (Ivan Mitic via suresh)

    YARN-213. YARN build script would be more readable using abspath.
    (Chris Nauroth via suresh)

    YARN-233. Added support for running containers in MS Windows to YARN. (Chris
    Nauroth via acmurthy)

    YARN-234. Added support for process tree and resource calculator in MS Windows 
    to YARN. (Chris Nauroth via acmurthy)

    YARN-259. Fix LocalDirsHandlerService to use Path rather than URIs. (Xuan
    Gong via acmurthy) 

    YARN-316. YARN container launch may exceed maximum Windows command line 
    length due to long classpath. (Chris Nauroth via suresh)

    YARN-359. Fixing commands for container signalling in Windows. (Chris Nauroth
    via vinodkv)

    YARN-506. Move to common utils FileUtil#setReadable/Writable/Executable and 
    FileUtil#canRead/Write/Execute. (Ivan Mitic via suresh)

    YARN-488. TestContainerManagerSecurity fails on Windows. (Chris Nauroth
    via hitesh)

    YARN-490. TestDistributedShell fails on Windows. (Chris Nauroth via hitesh)

    YARN-491. TestContainerLogsPage fails on Windows. (Chris Nauroth via hitesh)

    YARN-487. Modify path manipulation in LocalDirsHandlerService to let
    TestDiskFailures pass on Windows. (Chris Nauroth via vinodkv)

    YARN-593. container launch on Windows does not correctly populate
    classpath with new process's environment variables and localized resources
    (Chris Nauroth via bikas)

    YARN-493. Fixed some shell related flaws in YARN on Windows. (Chris Nauroth
    via vinodkv)

    YARN-839. TestContainerLaunch.testContainerEnvVariables fails on Windows.
    (Chuan Liu via cnauroth)

    YARN-597. TestFSDownload fails on Windows due to dependencies on
    tar/gzip/jar tools. (Ivan Mitic via acmurthy) 

    YARN-852. TestAggregatedLogFormat.testContainerLogsFileAccess fails on
    Windows. (Chuan Liu via cnauroth)

    YARN-894. NodeHealthScriptRunner timeout checking is inaccurate on Windows.
    (Chuan Liu via cnauroth)

    YARN-909. Disable TestLinuxContainerExecutorWithMocks on Windows. (Chuan Liu
    via cnauroth)

    YARN-1043. Push all metrics consistently. (Jian He via acmurthy) 

    YARN-1056. Remove dual use of string 'resourcemanager' in
    yarn.resourcemanager.connect.{max.wait.secs|retry_interval.secs}
    (Karthik Kambatla via acmurthy)

Release 2.0.6-alpha - 08/22/2013

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    YARN-854. Fixing YARN bugs that are failing applications in secure
    environment. (Omkar Vinit Joshi and shv)

Release 2.0.5-alpha - 06/06/2013

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

Release 2.0.4-alpha - 2013-04-25

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    YARN-429. capacity-scheduler config missing from yarn-test artifact.
    (sseth via hitesh)

    YARN-470. Support a way to disable resource monitoring on the NodeManager.
    (Siddharth Seth via hitesh)
    
Release 2.0.3-alpha - 2013-02-06 

  INCOMPATIBLE CHANGES

  NEW FEATURES

    YARN-145. Add a Web UI to the fair share scheduler. (Sandy Ryza via tomwhite)

    YARN-3. Add support for CPU isolation/monitoring of containers. 
    (adferguson via tucu)

    YARN-230. RM Restart phase 1 - includes support for saving/restarting all
    applications on an RM bounce. (Bikas Saha via acmurthy)

    YARN-103. Add a yarn AM-RM client module. (Bikas Saha via sseth)

    YARN-286. Add a YARN ApplicationClassLoader. (tomwhite)

    YARN-2. Enhanced CapacityScheduler to account for CPU alongwith memory for
    multi-dimensional resource scheduling. (acmurthy)

    YARN-328. Use token request messages defined in hadoop common. (suresh)

    YARN-231. RM Restart - Add FS-based persistent store implementation for
    RMStateStore (Bikas Saha via hitesh)

  IMPROVEMENTS

    YARN-223. Update process tree instead of getting new process trees.
    (Radim Kolar via llu)

    YARN-57. Allow process-tree based resource calculation et al. to be
    pluggable to support it on multiple platforms. (Radim Kolar via acmurthy)

    YARN-78. Changed UnManagedAM application to use YarnClient. (Bikas Saha via
    vinodkv)

    YARN-93. Fixed RM to propagate diagnostics from applications that have
    finished but failed (Jason Lowe via vinodkv). 

    YARN-28. Fixed TestCompositeService to not depend on test-order and thus
    made it pass on JDK7 (Thomas Graves via vinodkv).

    YARN-82. Change the default local and log dirs to be based on
    hadoop.tmp.dir and yarn.log.dir. (Hemanth Yamijala via sseth)

    YARN-53. Added the missing getGroups API to ResourceManager. (Bo Wang via
    vinodkv)

    YARN-116. Add the ability to change the RM include/exclude file without
    a restart. (xieguiming and Harsh J via sseth)

    YARN-23. FairScheduler: FSQueueSchedulable#updateDemand() - potential 
    redundant aggregation. (kkambatl via tucu)

    YARN-127. Move RMAdmin tool to its correct location - the client module.
    (vinodkv)

    YARN-40. Provided support for missing YARN commands (Devaraj K and Vinod
    Kumar Vavilapalli via vinodkv)

    YARN-33. Change LocalDirsHandlerService to validate the configured local and
    log dirs. (Mayank Bansal via sseth)

    YARN-94. Modify DistributedShell to point to main-class by default, clean up
    the help message, and hard-code the AM class. (Hitesh Shah via vinodkv)

    YARN-146. Add unit tests for computing fair share in the fair scheduler.
    (Sandy Ryza via tomwhite)

    HADOOP-8911. CRLF characters in source and text files.
    (Raja Aluri via suresh)

    YARN-136. Make ClientToAMTokenSecretManager part of RMContext (Vinod Kumar
    Vavilapalli via sseth)

    YARN-183. Clean up fair scheduler code. (Sandy Ryza via tomwhite)

    YARN-129. Simplify classpath construction for mini YARN tests. (tomwhite)

    YARN-254. Update fair scheduler web UI for hierarchical queues. 
    (sandyr via tucu)

    YARN-315. Using the common security token protobuf definition from hadoop
    common. (Suresh Srinivas via vinodkv) 

    YARN-170. Change NodeManager stop to be reentrant. (Sandy Ryza via vinodkv)

    YARN-331. Fill in missing fair scheduler documentation. (sandyr via tucu)

    YARN-277. Use AMRMClient in DistributedShell to exemplify the approach.
    (Bikas Saha via hitesh)

    YARN-360. Allow apps to concurrently register tokens for renewal.
    (Daryn Sharp via sseth)

  OPTIMIZATIONS

  BUG FIXES
    
    YARN-131. Fix incorrect ACL properties in capacity scheduler documentation.
    (Ahmed Radwan via sseth)

    YARN-102. Move the apache header to the top of the file in MemStore.java.
    (Devaraj K via sseth)
    
    YARN-134. ClientToAMSecretManager creates keys without checking for
    validity of the appID. (Vinod Kumar Vavilapalli via sseth)

    YARN-30. Fixed tests verifying web-services to work on JDK7. (Thomas Graves
    via vinodkv)

    YARN-150. Fixes AppRejectedTransition does not unregister a rejected
    app-attempt from the ApplicationMasterService (Bikas Saha via sseth)

    YARN-140. Add capacity-scheduler-default.xml to provide a default set of
    configurations for the capacity scheduler. (ahmed via tucu)

    YARN-179. Fix some unit test failures. (Vinod Kumar Vavilapalli via sseth)

    YARN-181. Fixed eclipse settings broken by capacity-scheduler.xml move via
    YARN-140. (Siddharth Seth via vinodkv)

    YARN-169. Update log4j.appender.EventCounter to use
    org.apache.hadoop.log.metrics.EventCounter (Anthony Rojas via tomwhite)

    YARN-184. Remove unnecessary locking in fair scheduler, and address 
    findbugs excludes. (sandyr via tucu)

    YARN-224. Fair scheduler logs too many nodeUpdate INFO messages.
    (Sandy Ryza via tomwhite)

    YARN-222. Fair scheduler should create queue for each user by default.
    (Sandy Ryza via tomwhite)

    MAPREDUCE-4778. Fair scheduler event log is only written if directory
    exists on HDFS. (Sandy Ryza via tomwhite)

    YARN-229. Remove old unused RM recovery code. (Bikas Saha via acmurthy) 

    YARN-187. Add hierarchical queues to the fair scheduler.
    (Sandy Ryza via tomwhite)

    YARN-72. NM should handle cleaning up containers when it shuts down.
    (Sandy Ryza via tomwhite)

    YARN-267. Fix fair scheduler web UI. (Sandy Ryza via tomwhite)

    YARN-264. y.s.rm.DelegationTokenRenewer attempts to renew token even 
    after removing an app. (kkambatl via tucu)

    YARN-271. Fair scheduler hits IllegalStateException trying to reserve
    different apps on same node. (Sandy Ryza via tomwhite)

    YARN-272. Fair scheduler log messages try to print objects without 
    overridden toString methods. (sandyr via tucu)

    YARN-278. Fair scheduler maxRunningApps config causes no apps to make
    progress. (sandyr via tucu)

    YARN-282. Fair scheduler web UI double counts Apps Submitted. 
    (sandyr via tucu)

    YARN-283. Fair scheduler fails to get queue info without root prefix. 
    (sandyr via tucu)

    YARN-192. Node update causes NPE in the fair scheduler.
    (Sandy Ryza via tomwhite)

    YARN-288. Fair scheduler queue doesn't accept any jobs when ACLs are
    configured. (Sandy Ryza via tomwhite)

    YARN-300. After YARN-271, fair scheduler can infinite loop and not
    schedule any application. (Sandy Ryza via tomwhite)

    YARN-301. Fair scheduler throws ConcurrentModificationException when
    iterating over app's priorities. (Sandy Ryza via tomwhite)

    YARN-217. Fix RMAdmin protocol description to make it work in secure mode
    also. (Devaraj K via vinodkv)

    YARN-253. Fixed container-launch to not fail when there are no local
    resources to localize. (Tom White via vinodkv)

    YARN-330. Fix flakey test: TestNodeManagerShutdown#testKillContainersOnShutdown.
    (Sandy Ryza via hitesh)
    
    YARN-335. Fair scheduler doesn't check whether rack needs containers
    before assigning to node. (Sandy Ryza via tomwhite)
    
    YARN-336. Fair scheduler FIFO scheduling within a queue only allows 1
    app at a time. (Sandy Ryza via tomwhite)

    YARN-135. Client tokens should be per app-attempt, and should be
    unregistered on App-finish. (vinodkv via sseth)

    YARN-302. Fair scheduler assignmultiple should default to false. (sandyr via tucu)
    
    YARN-372. Move InlineDispatcher from hadoop-yarn-server-resourcemanager to
    hadoop-yarn-common (sseth via hitesh)

    YARN-370. Fix SchedulerUtils to correctly round up the resource for
    containers. (Zhijie Shen via acmurthy) 

    YARN-355. Fixes a bug where RM app submission could jam under load.
    (Daryn Sharp via sseth)

Release 2.0.2-alpha - 2012-09-07 

  INCOMPATIBLE CHANGES

    YARN-9. Rename YARN_HOME to HADOOP_YARN_HOME. (vinodkv via acmurthy)

  NEW FEATURES

    YARN-1. Promote YARN to be a sub-project of Apache Hadoop. (acmurthy)

  IMPROVEMENTS

    YARN-29. Add a yarn-client module. (Vinod Kumar Vavilapalli via sseth)

    YARN-10. Fix DistributedShell module to not have a dependency on 
    hadoop-mapreduce-client-core. (Hitesh Shah via vinodkv)

    YARN-80. Add support for delaying rack-local containers in
    CapacityScheduler. (acmurthy) 

    YARN-137. Change the default YARN scheduler to be the CapacityScheduler. 
    (sseth via acmurthy) 

  OPTIMAZATIONS

  BUG FIXES

    YARN-12. Fix findbugs warnings in FairScheduler. (Junping Du via acmurthy) 

    YARN-22. Fix ContainerLogs to work if the log-dir is specified as a URI.
    (Mayank Bansal via sseth)

    YARN-37. Change TestRMAppTransitions to use the DrainDispatcher.
    (Mayank Bansal via sseth)

    YARN-79. Implement close on all clients to YARN so that RPC clients don't
    throw exceptions on shut-down. (Vinod Kumar Vavilapalli)

    YARN-42. Modify NM's non-aggregating logs' handler to stop properly so that
    NMs don't get NPEs on startup errors. (Devaraj K via vinodkv)

    YARN-15. Updated default classpath for YARN applications to reflect split of
    YARN into a sub-project. (Arun C Murthy via vinodkv)

    YARN-75. Modified ResourceManager's RMContainer to handle a valid RELEASE
    event at RUNNING state. (Siddharth Seth via vinodkv)

    MAPREDUCE-2374. "Text File Busy" errors launching MR tasks. (Andy Isaacson
    via atm)

    YARN-138. Ensure default values for minimum/maximum container sizes is
    sane. (harsh & sseth via acmurthy)

Release 0.23.11 - UNRELEASED

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

  BUG FIXES

    YARN-1180. Update capacity scheduler docs to include types on the configs
    (Chen He via jeagles)

Release 0.23.10 - 2013-12-09

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-985. Nodemanager should log where a resource was localized (Ravi
    Prakash via jeagles)

    YARN-1119. Add ClusterMetrics checks to tho TestRMNodeTransitions tests
    (Mit Desai via jeagles)

  OPTIMIZATIONS

  BUG FIXES

    YARN-337. RM handles killed application tracking URL poorly (jlowe)

    YARN-1101. Active nodes can be decremented below 0 (Robert Parker 
    via tgraves)

    YARN-1176. RM web services ClusterMetricsInfo total nodes doesn't include 
    unhealthy nodes (Jonathan Eagles via tgraves)

    YARN-1386. NodeManager mistakenly loses resources and relocalizes them
    (Jason Lowe via jeagles)

Release 0.23.9 - 2013-07-08

  INCOMPATIBLE CHANGES

  NEW FEATURES
    
  IMPROVEMENTS

    YARN-427. Coverage fix for org.apache.hadoop.yarn.server.api.* (Aleksey
    Gorshkov via jeagles)

    YARN-478. fix coverage org.apache.hadoop.yarn.webapp.log (Aleksey Gorshkov
    via jeagles)
    
  OPTIMIZATIONS

  BUG FIXES

Release 0.23.8 - 2013-06-05

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMIZATIONS

    YARN-548. Add tests for YarnUncaughtExceptionHandler (Vadim Bondarev via
    jeagles)

  BUG FIXES

    YARN-363. Add webapps/proxy directory without which YARN proxy-server fails
    when started in stand-alone mode. (Kenji Kikushima via vinodkv)

    YARN-690. RM exits on token cancel/renew problems (daryn via bobby)

Release 0.23.7 - 2013-04-18

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-133 Update web services docs for RM clusterMetrics (Ravi Prakash via
    kihwal)

    YARN-249. Capacity Scheduler web page should show list of active users per 
    queue like it used to (in 1.x) (Ravi Prakash via tgraves)

    YARN-236. RM should point tracking URL to RM web page when app fails to
    start (Jason Lowe via jeagles)

    YARN-269. Resource Manager not logging the health_check_script result when
    taking it out (Jason Lowe via kihwal)

    YARN-227. Application expiration difficult to debug for end-users
    (Jason Lowe via jeagles)
   
    YARN-443. allow OS scheduling priority of NM to be different than the 
    containers it launches (tgraves)

    YARN-468. coverage fix for org.apache.hadoop.yarn.server.webproxy.amfilter
    (Aleksey Gorshkov via bobby)

    YARN-200. yarn log does not output all needed information, and is in a
    binary format (Ravi Prakash via jlowe)

    YARN-525. make CS node-locality-delay refreshable (Thomas Graves via jlowe)

  OPTIMIZATIONS

    YARN-357. App submission should not be synchronized (daryn)

  BUG FIXES

    YARN-343. Capacity Scheduler maximum-capacity value -1 is invalid (Xuan 
    Gong via tgraves)

    YARN-364. AggregatedLogDeletionService can take too long to delete logs
    (jlowe)

    YARN-362. Unexpected extra results when using webUI table search (Ravi
    Prakash via jlowe)

    YARN-400. RM can return null application resource usage report leading to 
    NPE in client (Jason Lowe via tgraves)

    YARN-426. Failure to download a public resource prevents further downloads
    (Jason Lowe via bobby)

    YARN-448. Remove unnecessary hflush from log aggregation (Kihwal Lee via
    bobby)

    YARN-345. Many InvalidStateTransitonException errors for ApplicationImpl
    in Node Manager (Robert Parker via jlowe)

    YARN-109. .tmp file is not deleted for localized archives (Mayank Bansal 
    via bobby)

    YARN-460. CS user left in list of active users for the queue even when 
    application finished (tgraves)

Release 0.23.6 - 2013-02-06

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-285. Added a temporary plugin interface for RM to be able to redirect
    to JobHistory server for apps that it no longer tracks. (Derek Dagit via
    vinodkv)

  OPTIMIZATIONS

  BUG FIXES

    YARN-188. Coverage fixing for CapacityScheduler (Aleksey Gorshkov via
    bobby)

    YARN-214. RMContainerImpl does not handle event EXPIRE at state RUNNING
    (jeagles via bobby)

    YARN-151. Browser thinks RM main page JS is taking too long 
    (Ravi Prakash via bobby)

    YARN-204. test coverage for org.apache.hadoop.tools (Aleksey Gorshkov via
    bobby)

    YARN-251. Proxy URI generation fails for blank tracking URIs (Tom White
    via jlowe)

    YARN-258. RM web page UI shows Invalid Date for start and finish times
    (Ravi Prakash via jlowe)

    YARN-266. RM and JHS Web UIs are blank because AppsBlock is not escaping
    string properly (Ravi Prakash via jlowe)

    YARN-280. RM does not reject app submission with invalid tokens 
    (Daryn Sharp via tgraves)

    YARN-225. Proxy Link in RM UI thows NPE in Secure mode 
    (Devaraj K via bobby)

    YARN-293. Node Manager leaks LocalizerRunner object for every Container
    (Robert Joseph Evans via jlowe)

    YARN-50. Implement renewal / cancellation of Delegation Tokens
    (Siddharth Seth via tgraves)

    YARN-320. RM should always be able to renew its own tokens. 
    (Daryn Sharp via sseth)

    YARN-325. RM CapacityScheduler can deadlock when getQueueInfo() is 
    called and a container is completing (Arun C Murthy via tgraves)

    YARN-334. Maven RAT plugin is not checking all source files (tgraves)

    YARN-354. WebAppProxyServer exits immediately after startup (Liang Xie via
    jlowe)

Release 0.23.5 - 2012-11-28

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    YARN-161. Fix multiple compiler warnings for unchecked operations in YARN
    common. (Chris Nauroth via vinodkv)

    YARN-43. Fix TestResourceTrackerService to not depend on test order and thus
    pass on JDK7. (Thomas Graves via vinodkv)

    YARN-32. Fix TestApplicationTokens to not depend on test order and thus pass
    on JDK7. (vinodkv)

    YARN-186. Coverage fixing LinuxContainerExecutor (Aleksey Gorshkov via
    bobby)

    YARN-216. Remove jquery theming support. (Robert Joseph Evans via jlowe)

  OPTIMIZATIONS

  BUG FIXES

    YARN-163. Retrieving container log via NM webapp can hang with multibyte
    characters in log (jlowe via bobby)

    YARN-174. Modify NodeManager to pass the user's configuration even when
    rebooting. (vinodkv)

    YARN-177. CapacityScheduler - adding a queue while the RM is running has 
    wacky results (acmurthy vai tgraves)

    YARN-178. Fix custom ProcessTree instance creation (Radim Kolar via bobby)

    YARN-180. Capacity scheduler - containers that get reserved create 
    container token to early (acmurthy and bobby)

    YARN-139. Interrupted Exception within AsyncDispatcher leads to user
    confusion. (Vinod Kumar Vavilapalli via jlowe)

    YARN-165. RM should point tracking URL to RM web page for app when AM fails
    (jlowe via bobby)

    YARN-159. RM web ui applications page should be sorted to display last app
    first (tgraves via bobby)

    YARN-166. capacity scheduler doesn't allow capacity < 1.0 (tgraves via
    bobby)

    YARN-189. Fixed a deadlock between RM's ApplicationMasterService and the
    dispatcher. (Thomas Graves via vinodkv)

    YARN-202. Log Aggregation generates a storm of fsync() for namenode 
    (Kihwal Lee via bobby)

    YARN-201. Fix CapacityScheduler to be less conservative for starved 
    off-switch requests. (jlowe via acmurthy) 

    YARN-206. TestApplicationCleanup.testContainerCleanup occasionally fails.
    (jlowe via jeagles)

    YARN-212. NM state machine ignores an APPLICATION_CONTAINER_FINISHED event
    when it shouldn't (Nathan Roberts via jlowe)

    YARN-219. NM should aggregate logs when application finishes. (bobby)

Release 0.23.4

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

    Change package of YarnClient to org.apache.hadoop. (Bikas Saha via vinodkv)

    YARN-108. FSDownload can create cache directories with the wrong
    permissions (Jason Lowe via bobby)

  OPTIMIZATIONS

  BUG FIXES

    YARN-88. DefaultContainerExecutor can fail to set proper permissions.
    (Jason Lowe via sseth)

    YARN-106. Nodemanager needs to set permissions of local directories (jlowe
    via bobby)

Release 0.23.3

  INCOMPATIBLE CHANGES

  NEW FEATURES

  IMPROVEMENTS

  OPTIMAZATIONS

  BUG FIXES

    YARN-14. Symlinks to peer distributed cache files no longer work 
    (Jason Lowe via bobby) 

    YARN-25. remove old aggregated logs  (Robert Evans via tgraves)

    YARN-27. Failed refreshQueues due to misconfiguration prevents further 
    refreshing of queues (Arun Murthy via tgraves)

    YARN-58. NM leaks filesystems (Jason Lowe via jeagles)
    
    YARN-39. RM-NM secret-keys should be randomly generated and rolled every
    so often. (vinodkv and sseth via sseth)

    YARN-31. Fix TestDelegationTokenRenewer to not depend on test order so as to
    pass tests on jdk7. (Thomas Graves via vinodkv)

    YARN-63. RMNodeImpl is missing valid transitions from the UNHEALTHY state
    (Jason Lowe via bobby)

    YARN-60. Fixed a bug in ResourceManager which causes all NMs to get NPEs and
    thus causes all containers to be rejected. (vinodkv)

    YARN-66. aggregated logs permissions not set properly (tgraves via bobby)

    YARN-68. NodeManager will refuse to shutdown indefinitely due to container
    log aggregation (daryn via bobby)

    YARN-87. NM ResourceLocalizationService does not set permissions of local 
    cache directories (Jason Lowe via tgraves)