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# Apache Hadoop Changelog
## Release 3.3.1 - 2021-06-13
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-17338](https://issues.apache.org/jira/browse/HADOOP-17338) | Intermittent S3AInputStream failures: Premature end of Content-Length delimited message body etc | Major | fs/s3 | Yongjun Zhang | Yongjun Zhang |
| [HDFS-15380](https://issues.apache.org/jira/browse/HDFS-15380) | RBF: Could not fetch real remote IP in RouterWebHdfsMethods | Major | webhdfs | tomscut | tomscut |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-16916](https://issues.apache.org/jira/browse/HADOOP-16916) | ABFS: Delegation SAS generator for integration with Ranger | Minor | fs/azure | Thomas Marqardt | Thomas Marqardt |
| [HDFS-13183](https://issues.apache.org/jira/browse/HDFS-13183) | Standby NameNode process getBlocks request to reduce Active load | Major | balancer & mover, namenode | Xiaoqiao He | Xiaoqiao He |
| [HADOOP-17076](https://issues.apache.org/jira/browse/HADOOP-17076) | ABFS: Delegation SAS Generator Updates | Minor | fs/azure | Thomas Marqardt | Thomas Marqardt |
| [HADOOP-15891](https://issues.apache.org/jira/browse/HADOOP-15891) | Provide Regex Based Mount Point In Inode Tree | Major | viewfs | zhenzhao wang | zhenzhao wang |
| [HADOOP-17125](https://issues.apache.org/jira/browse/HADOOP-17125) | Using snappy-java in SnappyCodec | Major | common | DB Tsai | L. C. Hsieh |
| [HADOOP-17292](https://issues.apache.org/jira/browse/HADOOP-17292) | Using lz4-java in Lz4Codec | Major | common | L. C. Hsieh | L. C. Hsieh |
| [HDFS-15711](https://issues.apache.org/jira/browse/HDFS-15711) | Add Metrics to HttpFS Server | Major | httpfs | Ahmed Hussein | Ahmed Hussein |
| [MAPREDUCE-7315](https://issues.apache.org/jira/browse/MAPREDUCE-7315) | LocatedFileStatusFetcher to collect/publish IOStatistics | Minor | client | Steve Loughran | Steve Loughran |
| [HADOOP-16830](https://issues.apache.org/jira/browse/HADOOP-16830) | Add Public IOStatistics API | Major | fs, fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-15759](https://issues.apache.org/jira/browse/HDFS-15759) | EC: Verify EC reconstruction correctness on DataNode | Major | datanode, ec, erasure-coding | Toshihiko Uchida | Toshihiko Uchida |
| [HADOOP-16829](https://issues.apache.org/jira/browse/HADOOP-16829) | Über-jira: S3A Hadoop 3.3.1 features | Major | fs/s3 | Steve Loughran | Steve Loughran |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HDFS-15245](https://issues.apache.org/jira/browse/HDFS-15245) | Improve JournalNode web UI | Major | journal-node, ui | Jianfei Jiang | Jianfei Jiang |
| [HADOOP-16952](https://issues.apache.org/jira/browse/HADOOP-16952) | Add .diff to gitignore | Minor | . | Ayush Saxena | Ayush Saxena |
| [HADOOP-16954](https://issues.apache.org/jira/browse/HADOOP-16954) | Add -S option in "Count" command to show only Snapshot Counts | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15247](https://issues.apache.org/jira/browse/HDFS-15247) | RBF: Provide Non DFS Used per DataNode in DataNode UI | Major | . | Ayush Saxena | Lisheng Sun |
| [MAPREDUCE-7199](https://issues.apache.org/jira/browse/MAPREDUCE-7199) | HsJobsBlock reuse JobACLsManager for checkAccess | Minor | . | Bibin Chundatt | Bilwa S T |
| [HDFS-15295](https://issues.apache.org/jira/browse/HDFS-15295) | AvailableSpaceBlockPlacementPolicy should use chooseRandomWithStorageTypeTwoTrial() for better performance. | Minor | . | Jinglun | Jinglun |
| [HADOOP-16054](https://issues.apache.org/jira/browse/HADOOP-16054) | Update Dockerfile to use Bionic | Major | build, test | Akira Ajisaka | Akira Ajisaka |
| [YARN-10237](https://issues.apache.org/jira/browse/YARN-10237) | Add isAbsoluteResource config for queue in scheduler response | Minor | scheduler | Prabhu Joseph | Prabhu Joseph |
| [HADOOP-16886](https://issues.apache.org/jira/browse/HADOOP-16886) | Add hadoop.http.idle\_timeout.ms to core-default.xml | Major | . | Wei-Chiu Chuang | Lisheng Sun |
| [HDFS-14283](https://issues.apache.org/jira/browse/HDFS-14283) | DFSInputStream to prefer cached replica | Major | . | Wei-Chiu Chuang | Lisheng Sun |
| [HDFS-15338](https://issues.apache.org/jira/browse/HDFS-15338) | listOpenFiles() should throw InvalidPathException in case of invalid paths | Minor | . | Jinglun | Jinglun |
| [YARN-10160](https://issues.apache.org/jira/browse/YARN-10160) | Add auto queue creation related configs to RMWebService#CapacitySchedulerQueueInfo | Major | . | Prabhu Joseph | Prabhu Joseph |
| [HDFS-15255](https://issues.apache.org/jira/browse/HDFS-15255) | Consider StorageType when DatanodeManager#sortLocatedBlock() | Major | . | Lisheng Sun | Lisheng Sun |
| [YARN-10260](https://issues.apache.org/jira/browse/YARN-10260) | Allow transitioning queue from DRAINING to RUNNING state | Major | . | Jonathan Hung | Bilwa S T |
| [HADOOP-17036](https://issues.apache.org/jira/browse/HADOOP-17036) | TestFTPFileSystem failing as ftp server dir already exists | Minor | fs, test | Steve Loughran | Mikhail Pryakhin |
| [HDFS-15356](https://issues.apache.org/jira/browse/HDFS-15356) | Unify configuration \`dfs.ha.allow.stale.reads\` to DFSConfigKeys | Major | hdfs | Xiaoqiao He | Xiaoqiao He |
| [HDFS-15358](https://issues.apache.org/jira/browse/HDFS-15358) | RBF: Unify router datanode UI with namenode datanode UI | Major | . | Ayush Saxena | Ayush Saxena |
| [HADOOP-17042](https://issues.apache.org/jira/browse/HADOOP-17042) | Hadoop distcp throws "ERROR: Tools helper ///usr/lib/hadoop/libexec/tools/hadoop-distcp.sh was not found" | Minor | tools/distcp | Aki Tanaka | Aki Tanaka |
| [HDFS-15202](https://issues.apache.org/jira/browse/HDFS-15202) | HDFS-client: boost ShortCircuit Cache | Minor | dfsclient | Danil Lipovoy | Danil Lipovoy |
| [HDFS-15207](https://issues.apache.org/jira/browse/HDFS-15207) | VolumeScanner skip to scan blocks accessed during recent scan peroid | Minor | datanode | Yang Yun | Yang Yun |
| [HDFS-14999](https://issues.apache.org/jira/browse/HDFS-14999) | Avoid Potential Infinite Loop in DFSNetworkTopology | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-13639](https://issues.apache.org/jira/browse/HDFS-13639) | SlotReleaser is not fast enough | Major | hdfs-client | Gang Xie | Lisheng Sun |
| [HDFS-15369](https://issues.apache.org/jira/browse/HDFS-15369) | Refactor method VolumeScanner#runLoop() | Minor | datanode | Yang Yun | Yang Yun |
| [HADOOP-14698](https://issues.apache.org/jira/browse/HADOOP-14698) | Make copyFromLocal's -t option available for put as well | Major | . | Andras Bokor | Andras Bokor |
| [HDFS-10792](https://issues.apache.org/jira/browse/HDFS-10792) | RedundantEditLogInputStream should log caught exceptions | Minor | namenode | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-6492](https://issues.apache.org/jira/browse/YARN-6492) | Generate queue metrics for each partition | Major | capacity scheduler | Jonathan Hung | Manikandan R |
| [HADOOP-17016](https://issues.apache.org/jira/browse/HADOOP-17016) | Adding Common Counters in ABFS | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [HADOOP-16828](https://issues.apache.org/jira/browse/HADOOP-16828) | Zookeeper Delegation Token Manager fetch sequence number by batch | Major | . | Fengnan Li | Fengnan Li |
| [HADOOP-14566](https://issues.apache.org/jira/browse/HADOOP-14566) | Add seek support for SFTP FileSystem | Minor | fs | Azhagu Selvan SP | Mikhail Pryakhin |
| [HADOOP-17047](https://issues.apache.org/jira/browse/HADOOP-17047) | TODO comments exist in trunk while the related issues are already fixed. | Trivial | . | Rungroj Maipradit | Rungroj Maipradit |
| [HADOOP-17020](https://issues.apache.org/jira/browse/HADOOP-17020) | Improve RawFileSystem Performance | Minor | fs | Rajesh Balamohan | Mehakmeet Singh |
| [HDFS-15406](https://issues.apache.org/jira/browse/HDFS-15406) | Improve the speed of Datanode Block Scan | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HADOOP-17090](https://issues.apache.org/jira/browse/HADOOP-17090) | Increase precommit job timeout from 5 hours to 20 hours | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17084](https://issues.apache.org/jira/browse/HADOOP-17084) | Update Dockerfile\_aarch64 to use Bionic | Major | build, test | RuiChen | zhaorenhai |
| [YARN-8047](https://issues.apache.org/jira/browse/YARN-8047) | RMWebApp make external class pluggable | Minor | . | Bibin Chundatt | Bilwa S T |
| [YARN-10297](https://issues.apache.org/jira/browse/YARN-10297) | TestContinuousScheduling#testFairSchedulerContinuousSchedulingInitTime fails intermittently | Major | . | Jonathan Hung | Jim Brennan |
| [HADOOP-17127](https://issues.apache.org/jira/browse/HADOOP-17127) | Use RpcMetrics.TIMEUNIT to initialize rpc queueTime and processingTime | Minor | common | Jim Brennan | Jim Brennan |
| [HDFS-15404](https://issues.apache.org/jira/browse/HDFS-15404) | ShellCommandFencer should expose info about source | Major | . | Chen Liang | Chen Liang |
| [HADOOP-17147](https://issues.apache.org/jira/browse/HADOOP-17147) | Dead link in hadoop-kms/index.md.vm | Minor | documentation, kms | Akira Ajisaka | Xieming Li |
| [HADOOP-17113](https://issues.apache.org/jira/browse/HADOOP-17113) | Adding ReadAhead Counters in ABFS | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [YARN-10343](https://issues.apache.org/jira/browse/YARN-10343) | Legacy RM UI should include labeled metrics for allocated, total, and reserved resources. | Major | . | Eric Payne | Eric Payne |
| [YARN-1529](https://issues.apache.org/jira/browse/YARN-1529) | Add Localization overhead metrics to NM | Major | nodemanager | Gera Shegalov | Jim Brennan |
| [YARN-10361](https://issues.apache.org/jira/browse/YARN-10361) | Make custom DAO classes configurable into RMWebApp#JAXBContextResolver | Major | . | Prabhu Joseph | Bilwa S T |
| [YARN-10251](https://issues.apache.org/jira/browse/YARN-10251) | Show extended resources on legacy RM UI. | Major | . | Eric Payne | Eric Payne |
| [HDFS-15493](https://issues.apache.org/jira/browse/HDFS-15493) | Update block map and name cache in parallel while loading fsimage. | Major | namenode | Chengwei Wang | Chengwei Wang |
| [HADOOP-17057](https://issues.apache.org/jira/browse/HADOOP-17057) | ABFS driver enhancement - Allow customizable translation from AAD SPNs and security groups to Linux user and group | Major | fs/azure | Karthik Amarnath | Karthik Amarnath |
| [HADOOP-17194](https://issues.apache.org/jira/browse/HADOOP-17194) | Adding Context class for AbfsClient to pass AbfsConfigurations to limit number of parameters | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [HADOOP-17065](https://issues.apache.org/jira/browse/HADOOP-17065) | Adding Network Counters in ABFS | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [HADOOP-17159](https://issues.apache.org/jira/browse/HADOOP-17159) | Make UGI support forceful relogin from keytab ignoring the last login time | Major | security | Sandeep Guggilam | Sandeep Guggilam |
| [YARN-10407](https://issues.apache.org/jira/browse/YARN-10407) | Add phantomjsdriver.log to gitignore | Minor | . | Takanobu Asanuma | Takanobu Asanuma |
| [YARN-10353](https://issues.apache.org/jira/browse/YARN-10353) | Log vcores used and cumulative cpu in containers monitor | Minor | yarn | Jim Brennan | Jim Brennan |
| [YARN-10369](https://issues.apache.org/jira/browse/YARN-10369) | Make NMTokenSecretManagerInRM sending NMToken for nodeId DEBUG | Minor | yarn | Jim Brennan | Jim Brennan |
| [YARN-10390](https://issues.apache.org/jira/browse/YARN-10390) | LeafQueue: retain user limits cache across assignContainers() calls | Major | capacity scheduler, capacityscheduler | Muhammad Samir Khan | Muhammad Samir Khan |
| [HDFS-15574](https://issues.apache.org/jira/browse/HDFS-15574) | Remove unnecessary sort of block list in DirectoryScanner | Major | . | Stephen O'Donnell | Stephen O'Donnell |
| [HADOOP-17270](https://issues.apache.org/jira/browse/HADOOP-17270) | Fix testCompressorDecompressorWithExeedBufferLimit to cover the intended scenario | Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-15581](https://issues.apache.org/jira/browse/HDFS-15581) | Access Controlled HTTPFS Proxy | Minor | httpfs | Richard | Richard |
| [HADOOP-17283](https://issues.apache.org/jira/browse/HADOOP-17283) | Hadoop - Upgrade to JQuery 3.5.1 | Major | . | Aryan Gupta | Aryan Gupta |
| [HADOOP-17267](https://issues.apache.org/jira/browse/HADOOP-17267) | Add debug-level logs in Filesystem#close | Minor | fs | Karen Coppage | Karen Coppage |
| [HADOOP-17284](https://issues.apache.org/jira/browse/HADOOP-17284) | Support BCFKS keystores for Hadoop Credential Provider | Major | . | Xiaoyu Yao | Xiaoyu Yao |
| [HDFS-15415](https://issues.apache.org/jira/browse/HDFS-15415) | Reduce locking in Datanode DirectoryScanner | Major | datanode | Stephen O'Donnell | Stephen O'Donnell |
| [YARN-10451](https://issues.apache.org/jira/browse/YARN-10451) | RM (v1) UI NodesPage can NPE when yarn.io/gpu resource type is defined. | Major | . | Eric Payne | Eric Payne |
| [HADOOP-17021](https://issues.apache.org/jira/browse/HADOOP-17021) | Add concat fs command | Minor | fs | Jinglun | Jinglun |
| [MAPREDUCE-7301](https://issues.apache.org/jira/browse/MAPREDUCE-7301) | Expose Mini MR Cluster attribute for testing | Minor | test | Swaroopa Kadam | Swaroopa Kadam |
| [HDFS-15567](https://issues.apache.org/jira/browse/HDFS-15567) | [SBN Read] HDFS should expose msync() API to allow downstream applications call it explicitly. | Major | ha, hdfs-client | Konstantin Shvachko | Konstantin Shvachko |
| [HDFS-15633](https://issues.apache.org/jira/browse/HDFS-15633) | Avoid redundant RPC calls for getDiskStatus | Major | dfsclient | Ayush Saxena | Ayush Saxena |
| [YARN-10450](https://issues.apache.org/jira/browse/YARN-10450) | Add cpu and memory utilization per node and cluster-wide metrics | Minor | yarn | Jim Brennan | Jim Brennan |
| [HADOOP-17302](https://issues.apache.org/jira/browse/HADOOP-17302) | Upgrade to jQuery 3.5.1 in hadoop-sls | Major | . | Aryan Gupta | Aryan Gupta |
| [HDFS-15652](https://issues.apache.org/jira/browse/HDFS-15652) | Make block size from NNThroughputBenchmark configurable | Minor | benchmarks | Hui Fei | Hui Fei |
| [YARN-10475](https://issues.apache.org/jira/browse/YARN-10475) | Scale RM-NM heartbeat interval based on node utilization | Minor | yarn | Jim Brennan | Jim Brennan |
| [HDFS-15665](https://issues.apache.org/jira/browse/HDFS-15665) | Balancer logging improvement | Major | balancer & mover | Konstantin Shvachko | Konstantin Shvachko |
| [HADOOP-17342](https://issues.apache.org/jira/browse/HADOOP-17342) | Creating a token identifier should not do kerberos name resolution | Major | common | Jim Brennan | Jim Brennan |
| [YARN-10479](https://issues.apache.org/jira/browse/YARN-10479) | RMProxy should retry on SocketTimeout Exceptions | Major | yarn | Jim Brennan | Jim Brennan |
| [HDFS-15623](https://issues.apache.org/jira/browse/HDFS-15623) | Respect configured values of rpc.engine | Major | hdfs | Hector Sandoval Chaverri | Hector Sandoval Chaverri |
| [HADOOP-17369](https://issues.apache.org/jira/browse/HADOOP-17369) | Bump up snappy-java to 1.1.8.1 | Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-10480](https://issues.apache.org/jira/browse/YARN-10480) | replace href tags with ng-href | Trivial | . | Gabriel Medeiros Coelho | Gabriel Medeiros Coelho |
| [HADOOP-17367](https://issues.apache.org/jira/browse/HADOOP-17367) | Add InetAddress api to ProxyUsers.authorize | Major | performance, security | Ahmed Hussein | Ahmed Hussein |
| [MAPREDUCE-7304](https://issues.apache.org/jira/browse/MAPREDUCE-7304) | Enhance the map-reduce Job end notifier to be able to notify the given URL via a custom class | Major | mrv2 | Daniel Fritsi | Zoltán Erdmann |
| [MAPREDUCE-7309](https://issues.apache.org/jira/browse/MAPREDUCE-7309) | Improve performance of reading resource request for mapper/reducers from config | Major | applicationmaster | Wangda Tan | Peter Bacsko |
| [HDFS-15694](https://issues.apache.org/jira/browse/HDFS-15694) | Avoid calling UpdateHeartBeatState inside DataNodeDescriptor | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15703](https://issues.apache.org/jira/browse/HDFS-15703) | Don't generate edits for set operations that are no-op | Major | namenode | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17392](https://issues.apache.org/jira/browse/HADOOP-17392) | Remote exception messages should not include the exception class | Major | ipc | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15706](https://issues.apache.org/jira/browse/HDFS-15706) | HttpFS: Log more information on request failures | Major | httpfs | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17389](https://issues.apache.org/jira/browse/HADOOP-17389) | KMS should log full UGI principal | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17425](https://issues.apache.org/jira/browse/HADOOP-17425) | Bump up snappy-java to 1.1.8.2 | Minor | . | L. C. Hsieh | L. C. Hsieh |
| [HDFS-15720](https://issues.apache.org/jira/browse/HDFS-15720) | namenode audit async logger should add some log4j config | Minor | hdfs | Max Xie | |
| [HDFS-15717](https://issues.apache.org/jira/browse/HDFS-15717) | Improve fsck logging | Major | logging, namenode | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15704](https://issues.apache.org/jira/browse/HDFS-15704) | Mitigate lease monitor's rapid infinite loop | Major | namenode | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15569](https://issues.apache.org/jira/browse/HDFS-15569) | Speed up the Storage#doRecover during datanode rolling upgrade | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15751](https://issues.apache.org/jira/browse/HDFS-15751) | Add documentation for msync() API to filesystem.md | Major | documentation | Konstantin Shvachko | Konstantin Shvachko |
| [HADOOP-17454](https://issues.apache.org/jira/browse/HADOOP-17454) | [s3a] Disable bucket existence check - set fs.s3a.bucket.probe to 0 | Major | . | Gabor Bota | Gabor Bota |
| [YARN-10538](https://issues.apache.org/jira/browse/YARN-10538) | Add recommissioning nodes to the list of updated nodes returned to the AM | Major | . | Srinivas S T | Srinivas S T |
| [YARN-10541](https://issues.apache.org/jira/browse/YARN-10541) | capture the performance metrics of ZKRMStateStore | Minor | resourcemanager | Max Xie | Max Xie |
| [HADOOP-17408](https://issues.apache.org/jira/browse/HADOOP-17408) | Optimize NetworkTopology while sorting of block locations | Major | common, net | Ahmed Hussein | Ahmed Hussein |
| [YARN-4589](https://issues.apache.org/jira/browse/YARN-4589) | Diagnostics for localization timeouts is lacking | Major | . | Chang Li | Chang Li |
| [YARN-10562](https://issues.apache.org/jira/browse/YARN-10562) | Follow up changes for YARN-9833 | Major | yarn | Jim Brennan | Jim Brennan |
| [HDFS-15783](https://issues.apache.org/jira/browse/HDFS-15783) | Speed up BlockPlacementPolicyRackFaultTolerant#verifyBlockPlacement | Major | block placement | Akira Ajisaka | Akira Ajisaka |
| [YARN-10519](https://issues.apache.org/jira/browse/YARN-10519) | Refactor QueueMetricsForCustomResources class to move to yarn-common package | Major | . | Minni Mittal | Minni Mittal |
| [HADOOP-17484](https://issues.apache.org/jira/browse/HADOOP-17484) | Typo in hadop-aws index.md | Trivial | documentation, fs/s3 | Maksim | Maksim |
| [HADOOP-17478](https://issues.apache.org/jira/browse/HADOOP-17478) | Improve the description of hadoop.http.authentication.signature.secret.file | Minor | documentation | Akira Ajisaka | Akira Ajisaka |
| [MAPREDUCE-7317](https://issues.apache.org/jira/browse/MAPREDUCE-7317) | Add latency information in FileOutputCommitter.mergePaths | Minor | client | Jungtaek Lim | Jungtaek Lim |
| [HDFS-15789](https://issues.apache.org/jira/browse/HDFS-15789) | Lease renewal does not require namesystem lock | Major | hdfs | Jim Brennan | Jim Brennan |
| [HADOOP-17501](https://issues.apache.org/jira/browse/HADOOP-17501) | Fix logging typo in ShutdownHookManager | Major | common | Konstantin Shvachko | Fengnan Li |
| [HADOOP-17354](https://issues.apache.org/jira/browse/HADOOP-17354) | Move Jenkinsfile outside of the root directory | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17508](https://issues.apache.org/jira/browse/HADOOP-17508) | Simplify dependency installation instructions | Trivial | documentation | Gautham Banasandra | Gautham Banasandra |
| [HADOOP-17509](https://issues.apache.org/jira/browse/HADOOP-17509) | Parallelize building of dependencies | Minor | build | Gautham Banasandra | Gautham Banasandra |
| [HDFS-15799](https://issues.apache.org/jira/browse/HDFS-15799) | Make DisallowedDatanodeException terse | Minor | hdfs | Richard | Richard |
| [HDFS-15813](https://issues.apache.org/jira/browse/HDFS-15813) | DataStreamer: keep sending heartbeat packets while streaming | Major | hdfs | Jim Brennan | Jim Brennan |
| [MAPREDUCE-7319](https://issues.apache.org/jira/browse/MAPREDUCE-7319) | Log list of mappers at trace level in ShuffleHandler audit log | Minor | yarn | Jim Brennan | Jim Brennan |
| [HADOOP-14402](https://issues.apache.org/jira/browse/HADOOP-14402) | roll out StreamCapabilities across output streams of all filesystems | Major | fs, fs/adl, fs/azure, fs/oss, fs/s3, fs/swift | Steve Loughran | Steve Loughran |
| [HDFS-15821](https://issues.apache.org/jira/browse/HDFS-15821) | Add metrics for in-service datanodes | Minor | . | Zehao Chen | Zehao Chen |
| [YARN-10626](https://issues.apache.org/jira/browse/YARN-10626) | Log resource allocation in NM log at container start time | Major | . | Eric Badger | Eric Badger |
| [HDFS-15815](https://issues.apache.org/jira/browse/HDFS-15815) | if required storageType are unavailable, log the failed reason during choosing Datanode | Minor | block placement | Yang Yun | Yang Yun |
| [HDFS-15830](https://issues.apache.org/jira/browse/HDFS-15830) | Support to make dfs.image.parallel.load reconfigurable | Major | namenode | Hui Fei | Hui Fei |
| [HDFS-15835](https://issues.apache.org/jira/browse/HDFS-15835) | Erasure coding: Add/remove logs for the better readability/debugging | Minor | erasure-coding, hdfs | Bhavik Patel | Bhavik Patel |
| [HDFS-15826](https://issues.apache.org/jira/browse/HDFS-15826) | Solve the problem of incorrect progress of delegation tokens when loading FsImage | Major | . | JiangHua Zhu | JiangHua Zhu |
| [HDFS-15734](https://issues.apache.org/jira/browse/HDFS-15734) | [READ] DirectoryScanner#scan need not check StorageType.PROVIDED | Minor | datanode | Yuxuan Wang | Yuxuan Wang |
| [HADOOP-17538](https://issues.apache.org/jira/browse/HADOOP-17538) | Add kms-default.xml and httpfs-default.xml to site index | Minor | documentation | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-10613](https://issues.apache.org/jira/browse/YARN-10613) | Config to allow Intra- and Inter-queue preemption to enable/disable conservativeDRF | Minor | capacity scheduler, scheduler preemption | Eric Payne | Eric Payne |
| [YARN-10653](https://issues.apache.org/jira/browse/YARN-10653) | Fixed the findbugs issues introduced by YARN-10647. | Major | . | Qi Zhu | Qi Zhu |
| [MAPREDUCE-7324](https://issues.apache.org/jira/browse/MAPREDUCE-7324) | ClientHSSecurityInfo class is in wrong META-INF file | Major | . | Eric Badger | Eric Badger |
| [HADOOP-17546](https://issues.apache.org/jira/browse/HADOOP-17546) | Update Description of hadoop-http-auth-signature-secret in HttpAuthentication.md | Minor | . | Ravuri Sushma sree | Ravuri Sushma sree |
| [YARN-10664](https://issues.apache.org/jira/browse/YARN-10664) | Allow parameter expansion in NM\_ADMIN\_USER\_ENV | Major | yarn | Jim Brennan | Jim Brennan |
| [HADOOP-17570](https://issues.apache.org/jira/browse/HADOOP-17570) | Apply YETUS-1102 to re-enable GitHub comments | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17594](https://issues.apache.org/jira/browse/HADOOP-17594) | DistCp: Expose the JobId for applications executing through run method | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15907](https://issues.apache.org/jira/browse/HDFS-15907) | Reduce Memory Overhead of AclFeature by avoiding AtomicInteger | Major | namenode | Stephen O'Donnell | Stephen O'Donnell |
| [HDFS-15911](https://issues.apache.org/jira/browse/HDFS-15911) | Provide blocks moved count in Balancer iteration result | Major | balancer & mover | Viraj Jasani | Viraj Jasani |
| [HDFS-15919](https://issues.apache.org/jira/browse/HDFS-15919) | BlockPoolManager should log stack trace if unable to get Namenode addresses | Major | datanode | Stephen O'Donnell | Stephen O'Donnell |
| [HADOOP-17531](https://issues.apache.org/jira/browse/HADOOP-17531) | DistCp: Reduce memory usage on copying huge directories | Critical | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15879](https://issues.apache.org/jira/browse/HDFS-15879) | Exclude slow nodes when choose targets for blocks | Major | . | tomscut | tomscut |
| [HADOOP-16870](https://issues.apache.org/jira/browse/HADOOP-16870) | Use spotbugs-maven-plugin instead of findbugs-maven-plugin | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17222](https://issues.apache.org/jira/browse/HADOOP-17222) | Create socket address leveraging URI cache | Major | common, hdfs-client | fanrui | fanrui |
| [HDFS-15932](https://issues.apache.org/jira/browse/HDFS-15932) | Improve the balancer error message when process exits abnormally. | Major | . | Renukaprasad C | Renukaprasad C |
| [HADOOP-16524](https://issues.apache.org/jira/browse/HADOOP-16524) | Automatic keystore reloading for HttpServer2 | Major | . | Kihwal Lee | Borislav Iordanov |
| [HDFS-15931](https://issues.apache.org/jira/browse/HDFS-15931) | Fix non-static inner classes for better memory management | Major | . | Viraj Jasani | Viraj Jasani |
| [HADOOP-17371](https://issues.apache.org/jira/browse/HADOOP-17371) | Bump Jetty to the latest version 9.4.35 | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-15942](https://issues.apache.org/jira/browse/HDFS-15942) | Increase Quota initialization threads | Major | namenode | Stephen O'Donnell | Stephen O'Donnell |
| [HADOOP-17613](https://issues.apache.org/jira/browse/HADOOP-17613) | Log not flushed fully when daemon shutdown | Major | common | Renukaprasad C | Renukaprasad C |
| [HDFS-15937](https://issues.apache.org/jira/browse/HDFS-15937) | Reduce memory used during datanode layout upgrade | Major | datanode | Stephen O'Donnell | Stephen O'Donnell |
| [HDFS-15160](https://issues.apache.org/jira/browse/HDFS-15160) | ReplicaMap, Disk Balancer, Directory Scanner and various FsDatasetImpl methods should use datanode readlock | Major | datanode | Stephen O'Donnell | Stephen O'Donnell |
| [HADOOP-17569](https://issues.apache.org/jira/browse/HADOOP-17569) | Building native code fails on Fedora 33 | Major | build, common | Kengo Seki | Masatake Iwasaki |
| [HADOOP-17633](https://issues.apache.org/jira/browse/HADOOP-17633) | Please upgrade json-smart dependency to the latest version | Major | auth, build | helen huang | Viraj Jasani |
| [HADOOP-17620](https://issues.apache.org/jira/browse/HADOOP-17620) | DistCp: Use Iterator for listing target directory as well | Major | . | Ayush Saxena | Ayush Saxena |
| [YARN-10743](https://issues.apache.org/jira/browse/YARN-10743) | Add a policy for not aggregating for containers which are killed because exceeding container log size limit. | Major | . | Qi Zhu | Qi Zhu |
| [HDFS-15967](https://issues.apache.org/jira/browse/HDFS-15967) | Improve the log for Short Circuit Local Reads | Minor | . | Bhavik Patel | Bhavik Patel |
| [HADOOP-17675](https://issues.apache.org/jira/browse/HADOOP-17675) | LdapGroupsMapping$LdapSslSocketFactory ClassNotFoundException | Major | common | Tamas Mate | István Fajth |
| [HADOOP-11616](https://issues.apache.org/jira/browse/HADOOP-11616) | Remove workaround for Curator's ChildReaper requiring Guava 15+ | Major | . | Robert Kanter | Viraj Jasani |
| [HDFS-16003](https://issues.apache.org/jira/browse/HDFS-16003) | ProcessReport print invalidatedBlocks should judge debug level at first | Minor | namanode | lei w | lei w |
| [HDFS-16007](https://issues.apache.org/jira/browse/HDFS-16007) | Deserialization of ReplicaState should avoid throwing ArrayIndexOutOfBoundsException | Major | . | junwen yang | Viraj Jasani |
| [HADOOP-17615](https://issues.apache.org/jira/browse/HADOOP-17615) | ADLFS: Update SDK version from 2.3.6 to 2.3.9 | Minor | fs/adl | Bilahari T H | Bilahari T H |
| [HADOOP-16822](https://issues.apache.org/jira/browse/HADOOP-16822) | Provide source artifacts for hadoop-client-api | Major | . | Karel Kolman | Karel Kolman |
| [HADOOP-17680](https://issues.apache.org/jira/browse/HADOOP-17680) | Allow ProtobufRpcEngine to be extensible | Major | common | Hector Sandoval Chaverri | Hector Sandoval Chaverri |
| [YARN-10258](https://issues.apache.org/jira/browse/YARN-10258) | Add metrics for 'ApplicationsRunning' in NodeManager | Minor | nodemanager | ANANDA G B | ANANDA G B |
| [HDFS-15790](https://issues.apache.org/jira/browse/HDFS-15790) | Make ProtobufRpcEngineProtos and ProtobufRpcEngineProtos2 Co-Exist | Critical | . | David Mollitor | Vinayakumar B |
### BUG FIXES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HDFS-15196](https://issues.apache.org/jira/browse/HDFS-15196) | RBF: RouterRpcServer getListing cannot list large dirs correctly | Critical | . | Fengnan Li | Fengnan Li |
| [HDFS-15252](https://issues.apache.org/jira/browse/HDFS-15252) | HttpFS: setWorkingDirectory should not accept invalid paths | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15249](https://issues.apache.org/jira/browse/HDFS-15249) | ThrottledAsyncChecker is not thread-safe. | Major | federation | Toshihiro Suzuki | Toshihiro Suzuki |
| [HDFS-15266](https://issues.apache.org/jira/browse/HDFS-15266) | Add missing DFSOps Statistics in WebHDFS | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15275](https://issues.apache.org/jira/browse/HDFS-15275) | HttpFS: Response of Create was not correct with noredirect and data are true | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15281](https://issues.apache.org/jira/browse/HDFS-15281) | ZKFC ignores dfs.namenode.rpc-bind-host and uses dfs.namenode.rpc-address to bind to host address | Major | ha, namenode | Dhiraj Hegde | Dhiraj Hegde |
| [HDFS-15297](https://issues.apache.org/jira/browse/HDFS-15297) | TestNNHandlesBlockReportPerStorage::blockReport\_02 fails intermittently in trunk | Major | datanode, test | Mingliang Liu | Ayush Saxena |
| [HDFS-15210](https://issues.apache.org/jira/browse/HDFS-15210) | EC : File write hanged when DN is shutdown by admin command. | Major | ec | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-15285](https://issues.apache.org/jira/browse/HDFS-15285) | The same distance and load nodes don't shuffle when consider DataNode load | Major | . | Lisheng Sun | Lisheng Sun |
| [HDFS-15265](https://issues.apache.org/jira/browse/HDFS-15265) | HttpFS: validate content-type in HttpFSUtils | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15320](https://issues.apache.org/jira/browse/HDFS-15320) | StringIndexOutOfBoundsException in HostRestrictingAuthorizationFilter | Major | webhdfs | Akira Ajisaka | Akira Ajisaka |
| [YARN-10256](https://issues.apache.org/jira/browse/YARN-10256) | Refactor TestContainerSchedulerQueuing.testContainerUpdateExecTypeGuaranteedToOpportunistic | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15270](https://issues.apache.org/jira/browse/HDFS-15270) | Account for \*env == NULL in hdfsThreadDestructor | Major | . | Babneet Singh | Babneet Singh |
| [HDFS-15331](https://issues.apache.org/jira/browse/HDFS-15331) | Remove invalid exclusions that minicluster dependency on HDFS | Major | . | Wanqiang Ji | Wanqiang Ji |
| [YARN-8959](https://issues.apache.org/jira/browse/YARN-8959) | TestContainerResizing fails randomly | Minor | . | Bibin Chundatt | Ahmed Hussein |
| [HDFS-15332](https://issues.apache.org/jira/browse/HDFS-15332) | Quota Space consumed was wrong in truncate with Snapshots | Major | . | Hemanth Boyina | Hemanth Boyina |
| [YARN-9017](https://issues.apache.org/jira/browse/YARN-9017) | PlacementRule order is not maintained in CS | Major | . | Bibin Chundatt | Bilwa S T |
| [HADOOP-17025](https://issues.apache.org/jira/browse/HADOOP-17025) | Fix invalid metastore configuration in S3GuardTool tests | Minor | fs/s3, test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-15339](https://issues.apache.org/jira/browse/HDFS-15339) | TestHDFSCLI fails for user names with the dot/dash character | Major | test | Yan Xiaole | Yan Xiaole |
| [HDFS-15250](https://issues.apache.org/jira/browse/HDFS-15250) | Setting \`dfs.client.use.datanode.hostname\` to true can crash the system because of unhandled UnresolvedAddressException | Major | . | Ctest | Ctest |
| [HADOOP-16768](https://issues.apache.org/jira/browse/HADOOP-16768) | SnappyCompressor test cases wrongly assume that the compressed data is always smaller than the input data | Major | io, test | zhao bo | Akira Ajisaka |
| [HDFS-1820](https://issues.apache.org/jira/browse/HDFS-1820) | FTPFileSystem attempts to close the outputstream even when it is not initialised | Major | hdfs-client | Sudharsan Sampath | Mikhail Pryakhin |
| [HDFS-15243](https://issues.apache.org/jira/browse/HDFS-15243) | Add an option to prevent sub-directories of protected directories from deletion | Major | 3.1.1 | liuyanyu | liuyanyu |
| [HDFS-14367](https://issues.apache.org/jira/browse/HDFS-14367) | EC: Parameter maxPoolSize in striped reconstruct thread pool isn't affecting number of threads | Major | ec | Guo Lei | Guo Lei |
| [YARN-9301](https://issues.apache.org/jira/browse/YARN-9301) | Too many InvalidStateTransitionException with SLS | Major | . | Bibin Chundatt | Bilwa S T |
| [HDFS-15300](https://issues.apache.org/jira/browse/HDFS-15300) | RBF: updateActiveNamenode() is invalid when RPC address is IP | Major | . | xuzq | xuzq |
| [HDFS-15316](https://issues.apache.org/jira/browse/HDFS-15316) | Deletion failure should not remove directory from snapshottables | Major | . | Hemanth Boyina | Hemanth Boyina |
| [YARN-8942](https://issues.apache.org/jira/browse/YARN-8942) | PriorityBasedRouterPolicy throws exception if all sub-cluster weights have negative value | Minor | . | Akshay Agarwal | Bilwa S T |
| [HADOOP-17044](https://issues.apache.org/jira/browse/HADOOP-17044) | Revert "HADOOP-8143. Change distcp to have -pb on by default" | Major | tools/distcp | Steve Loughran | Steve Loughran |
| [HADOOP-17024](https://issues.apache.org/jira/browse/HADOOP-17024) | ListStatus on ViewFS root (ls "/") should list the linkFallBack root (configured target root). | Major | fs, viewfs | Uma Maheswara Rao G | Abhishek Das |
| [MAPREDUCE-6826](https://issues.apache.org/jira/browse/MAPREDUCE-6826) | Job fails with InvalidStateTransitonException: Invalid event: JOB\_TASK\_COMPLETED at SUCCEEDED/COMMITTING | Major | . | Varun Saxena | Bilwa S T |
| [HADOOP-16900](https://issues.apache.org/jira/browse/HADOOP-16900) | Very large files can be truncated when written through S3AFileSystem | Major | fs/s3 | Andrew Olson | Mukund Thakur |
| [HADOOP-17049](https://issues.apache.org/jira/browse/HADOOP-17049) | javax.activation-api and jakarta.activation-api define overlapping classes | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17040](https://issues.apache.org/jira/browse/HADOOP-17040) | Fix intermittent failure of ITestBlockingThreadPoolExecutorService | Minor | fs/s3, test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-15363](https://issues.apache.org/jira/browse/HDFS-15363) | BlockPlacementPolicyWithNodeGroup should validate if it is initialized by NetworkTopologyWithNodeGroup | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15093](https://issues.apache.org/jira/browse/HDFS-15093) | RENAME.TO\_TRASH is ignored When RENAME.OVERWRITE is specified | Major | . | Harshakiran Reddy | Ayush Saxena |
| [HDFS-12288](https://issues.apache.org/jira/browse/HDFS-12288) | Fix DataNode's xceiver count calculation | Major | datanode, hdfs | Lukas Majercak | Lisheng Sun |
| [HDFS-15362](https://issues.apache.org/jira/browse/HDFS-15362) | FileWithSnapshotFeature#updateQuotaAndCollectBlocks should collect all distinct blocks | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HADOOP-7002](https://issues.apache.org/jira/browse/HADOOP-7002) | Wrong description of copyFromLocal and copyToLocal in documentation | Minor | . | Jingguo Yao | Andras Bokor |
| [HADOOP-17052](https://issues.apache.org/jira/browse/HADOOP-17052) | NetUtils.connect() throws unchecked exception (UnresolvedAddressException) causing clients to abort | Major | net | Dhiraj Hegde | Dhiraj Hegde |
| [HADOOP-17018](https://issues.apache.org/jira/browse/HADOOP-17018) | Intermittent failing of ITestAbfsStreamStatistics in ABFS | Minor | fs/azure, test | Mehakmeet Singh | Mehakmeet Singh |
| [YARN-10254](https://issues.apache.org/jira/browse/YARN-10254) | CapacityScheduler incorrect User Group Mapping after leaf queue change | Major | . | Gergely Pollák | Gergely Pollák |
| [HADOOP-17062](https://issues.apache.org/jira/browse/HADOOP-17062) | Fix shelldocs path in Jenkinsfile | Major | build | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17056](https://issues.apache.org/jira/browse/HADOOP-17056) | shelldoc fails in hadoop-common | Major | build | Akira Ajisaka | Akira Ajisaka |
| [YARN-10286](https://issues.apache.org/jira/browse/YARN-10286) | PendingContainers bugs in the scheduler outputs | Critical | . | Adam Antal | Andras Gyori |
| [HDFS-15396](https://issues.apache.org/jira/browse/HDFS-15396) | Fix TestViewFileSystemOverloadSchemeHdfsFileSystemContract#testListStatusRootDir | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15386](https://issues.apache.org/jira/browse/HDFS-15386) | ReplicaNotFoundException keeps happening in DN after removing multiple DN's data directories | Major | . | Toshihiro Suzuki | Toshihiro Suzuki |
| [HDFS-15398](https://issues.apache.org/jira/browse/HDFS-15398) | EC: hdfs client hangs due to exception during addBlock | Critical | ec, hdfs-client | Hongbing Wang | Hongbing Wang |
| [YARN-10300](https://issues.apache.org/jira/browse/YARN-10300) | appMasterHost not set in RM ApplicationSummary when AM fails before first heartbeat | Major | . | Eric Badger | Eric Badger |
| [HADOOP-17059](https://issues.apache.org/jira/browse/HADOOP-17059) | ArrayIndexOfboundsException in ViewFileSystem#listStatus | Major | viewfs | Hemanth Boyina | Hemanth Boyina |
| [YARN-10296](https://issues.apache.org/jira/browse/YARN-10296) | Make ContainerPBImpl#getId/setId synchronized | Minor | . | Benjamin Teke | Benjamin Teke |
| [HADOOP-17060](https://issues.apache.org/jira/browse/HADOOP-17060) | listStatus and getFileStatus behave inconsistent in the case of ViewFs implementation for isDirectory | Major | viewfs | Srinivasu Majeti | Uma Maheswara Rao G |
| [YARN-10312](https://issues.apache.org/jira/browse/YARN-10312) | Add support for yarn logs -logFile to retain backward compatibility | Major | client | Jim Brennan | Jim Brennan |
| [HDFS-15351](https://issues.apache.org/jira/browse/HDFS-15351) | Blocks scheduled count was wrong on truncate | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15403](https://issues.apache.org/jira/browse/HDFS-15403) | NPE in FileIoProvider#transferToSocketFully | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15372](https://issues.apache.org/jira/browse/HDFS-15372) | Files in snapshots no longer see attribute provider permissions | Major | . | Stephen O'Donnell | Stephen O'Donnell |
| [MAPREDUCE-7281](https://issues.apache.org/jira/browse/MAPREDUCE-7281) | Fix NoClassDefFoundError on 'mapred minicluster' | Major | . | Masatake Iwasaki | Masatake Iwasaki |
| [HADOOP-17029](https://issues.apache.org/jira/browse/HADOOP-17029) | ViewFS does not return correct user/group and ACL | Major | fs, viewfs | Abhishek Das | Abhishek Das |
| [HDFS-14546](https://issues.apache.org/jira/browse/HDFS-14546) | Document block placement policies | Major | . | Íñigo Goiri | Amithsha |
| [HADOOP-17068](https://issues.apache.org/jira/browse/HADOOP-17068) | client fails forever when namenode ipaddr changed | Major | hdfs-client | Sean Chow | Sean Chow |
| [HADOOP-17089](https://issues.apache.org/jira/browse/HADOOP-17089) | WASB: Update azure-storage-java SDK | Critical | fs/azure | Thomas Marqardt | Thomas Marqardt |
| [HDFS-15378](https://issues.apache.org/jira/browse/HDFS-15378) | TestReconstructStripedFile#testErasureCodingWorkerXmitsWeight is failing on trunk | Major | . | Hemanth Boyina | Hemanth Boyina |
| [YARN-9903](https://issues.apache.org/jira/browse/YARN-9903) | Support reservations continue looking for Node Labels | Major | . | Tarun Parimi | Jim Brennan |
| [YARN-10331](https://issues.apache.org/jira/browse/YARN-10331) | Upgrade node.js to 10.21.0 | Critical | build, yarn-ui-v2 | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17032](https://issues.apache.org/jira/browse/HADOOP-17032) | Handle an internal dir in viewfs having multiple children mount points pointing to different filesystems | Major | fs, viewfs | Abhishek Das | Abhishek Das |
| [YARN-10318](https://issues.apache.org/jira/browse/YARN-10318) | ApplicationHistory Web UI incorrect column indexing | Minor | yarn | Andras Gyori | Andras Gyori |
| [YARN-10330](https://issues.apache.org/jira/browse/YARN-10330) | Add missing test scenarios to TestUserGroupMappingPlacementRule and TestAppNameMappingPlacementRule | Major | capacity scheduler, capacityscheduler, test | Peter Bacsko | Peter Bacsko |
| [HDFS-15446](https://issues.apache.org/jira/browse/HDFS-15446) | CreateSnapshotOp fails during edit log loading for /.reserved/raw/path with error java.io.FileNotFoundException: Directory does not exist: /.reserved/raw/path | Major | hdfs | Srinivasu Majeti | Stephen O'Donnell |
| [HADOOP-17081](https://issues.apache.org/jira/browse/HADOOP-17081) | MetricsSystem doesn't start the sink adapters on restart | Minor | metrics | Madhusoodan | Madhusoodan |
| [HDFS-15451](https://issues.apache.org/jira/browse/HDFS-15451) | Restarting name node stuck in safe mode when using provided storage | Major | namenode | shanyu zhao | shanyu zhao |
| [HADOOP-17117](https://issues.apache.org/jira/browse/HADOOP-17117) | Fix typos in hadoop-aws documentation | Trivial | documentation, fs/s3 | Sebastian Nagel | Sebastian Nagel |
| [HADOOP-17120](https://issues.apache.org/jira/browse/HADOOP-17120) | Fix failure of docker image creation due to pip2 install error | Major | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-10344](https://issues.apache.org/jira/browse/YARN-10344) | Sync netty versions in hadoop-yarn-csi | Major | build | Akira Ajisaka | Akira Ajisaka |
| [YARN-10341](https://issues.apache.org/jira/browse/YARN-10341) | Yarn Service Container Completed event doesn't get processed | Critical | . | Bilwa S T | Bilwa S T |
| [HADOOP-16998](https://issues.apache.org/jira/browse/HADOOP-16998) | WASB : NativeAzureFsOutputStream#close() throwing IllegalArgumentException | Major | fs/azure | Anoop Sam John | Anoop Sam John |
| [YARN-10348](https://issues.apache.org/jira/browse/YARN-10348) | Allow RM to always cancel tokens after app completes | Major | yarn | Jim Brennan | Jim Brennan |
| [MAPREDUCE-7284](https://issues.apache.org/jira/browse/MAPREDUCE-7284) | TestCombineFileInputFormat#testMissingBlocks fails | Major | test | Akira Ajisaka | Akira Ajisaka |
| [HDFS-14498](https://issues.apache.org/jira/browse/HDFS-14498) | LeaseManager can loop forever on the file for which create has failed | Major | namenode | Sergey Shelukhin | Stephen O'Donnell |
| [HADOOP-17130](https://issues.apache.org/jira/browse/HADOOP-17130) | Configuration.getValByRegex() shouldn't update the results while fetching. | Major | common | Mukund Thakur | Mukund Thakur |
| [HDFS-15198](https://issues.apache.org/jira/browse/HDFS-15198) | RBF: Add test for MountTableRefresherService failed to refresh other router MountTableEntries in secure mode | Major | rbf | zhengchenyu | zhengchenyu |
| [HADOOP-17119](https://issues.apache.org/jira/browse/HADOOP-17119) | Jetty upgrade to 9.4.x causes MR app fail with IOException | Major | . | Bilwa S T | Bilwa S T |
| [HDFS-15246](https://issues.apache.org/jira/browse/HDFS-15246) | ArrayIndexOfboundsException in BlockManager CreateLocatedBlock | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HADOOP-17138](https://issues.apache.org/jira/browse/HADOOP-17138) | Fix spotbugs warnings surfaced after upgrade to 4.0.6 | Minor | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-4771](https://issues.apache.org/jira/browse/YARN-4771) | Some containers can be skipped during log aggregation after NM restart | Major | nodemanager | Jason Darrell Lowe | Jim Brennan |
| [YARN-10367](https://issues.apache.org/jira/browse/YARN-10367) | Failed to get nodejs 10.21.0 when building docker image | Blocker | build, webapp | Akira Ajisaka | Akira Ajisaka |
| [MAPREDUCE-7051](https://issues.apache.org/jira/browse/MAPREDUCE-7051) | Fix typo in MultipleOutputFormat | Trivial | . | ywheel | ywheel |
| [HDFS-15313](https://issues.apache.org/jira/browse/HDFS-15313) | Ensure inodes in active filesystem are not deleted during snapshot delete | Major | snapshots | Shashikant Banerjee | Shashikant Banerjee |
| [HDFS-14950](https://issues.apache.org/jira/browse/HDFS-14950) | missing libhdfspp libs in dist-package | Major | build, libhdfs++ | Yuan Zhou | Yuan Zhou |
| [YARN-10359](https://issues.apache.org/jira/browse/YARN-10359) | Log container report only if list is not empty | Minor | . | Bilwa S T | Bilwa S T |
| [YARN-10229](https://issues.apache.org/jira/browse/YARN-10229) | [Federation] Client should be able to submit application to RM directly using normal client conf | Major | amrmproxy, federation | JohnsonGuo | Bilwa S T |
| [HDFS-15503](https://issues.apache.org/jira/browse/HDFS-15503) | File and directory permissions are not able to be modified from WebUI | Major | . | Hemanth Boyina | Hemanth Boyina |
| [HADOOP-17184](https://issues.apache.org/jira/browse/HADOOP-17184) | Add --mvn-custom-repos parameter to yetus calls | Major | build | Mingliang Liu | Mingliang Liu |
| [HDFS-15499](https://issues.apache.org/jira/browse/HDFS-15499) | Clean up httpfs/pom.xml to remove aws-java-sdk-s3 exclusion | Major | httpfs | Mingliang Liu | Mingliang Liu |
| [HADOOP-17186](https://issues.apache.org/jira/browse/HADOOP-17186) | Fixing javadoc in ListingOperationCallbacks | Major | build, documentation | Akira Ajisaka | Mukund Thakur |
| [HADOOP-17164](https://issues.apache.org/jira/browse/HADOOP-17164) | UGI loginUserFromKeytab doesn't set the last login time | Major | security | Sandeep Guggilam | Sandeep Guggilam |
| [YARN-4575](https://issues.apache.org/jira/browse/YARN-4575) | ApplicationResourceUsageReport should return ALL reserved resource | Major | . | Bibin Chundatt | Bibin Chundatt |
| [YARN-10388](https://issues.apache.org/jira/browse/YARN-10388) | RMNode updatedCapability flag not set while RecommissionNodeTransition | Major | resourcemanager | Pranjal Protim Borah | Pranjal Protim Borah |
| [HDFS-15443](https://issues.apache.org/jira/browse/HDFS-15443) | Setting dfs.datanode.max.transfer.threads to a very small value can cause strange failure. | Major | datanode | AMC-team | AMC-team |
| [HDFS-15508](https://issues.apache.org/jira/browse/HDFS-15508) | [JDK 11] Fix javadoc errors in hadoop-hdfs-rbf module | Major | documentation | Akira Ajisaka | Akira Ajisaka |
| [HDFS-15506](https://issues.apache.org/jira/browse/HDFS-15506) | [JDK 11] Fix javadoc errors in hadoop-hdfs module | Major | documentation | Akira Ajisaka | Xieming Li |
| [HDFS-15507](https://issues.apache.org/jira/browse/HDFS-15507) | [JDK 11] Fix javadoc errors in hadoop-hdfs-client module | Major | documentation | Akira Ajisaka | Xieming Li |
| [HADOOP-17196](https://issues.apache.org/jira/browse/HADOOP-17196) | Fix C/C++ standard warnings | Major | build | Gautham Banasandra | Gautham Banasandra |
| [HADOOP-17204](https://issues.apache.org/jira/browse/HADOOP-17204) | Fix typo in Hadoop KMS document | Trivial | documentation, kms | Akira Ajisaka | Xieming Li |
| [HADOOP-17192](https://issues.apache.org/jira/browse/HADOOP-17192) | ITestS3AHugeFilesSSECDiskBlock failing because of bucket overrides | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [YARN-10336](https://issues.apache.org/jira/browse/YARN-10336) | RM page should throw exception when command injected in RM REST API to get applications | Major | . | Rajshree Mishra | Bilwa S T |
| [HDFS-15439](https://issues.apache.org/jira/browse/HDFS-15439) | Setting dfs.mover.retry.max.attempts to negative value will retry forever. | Major | balancer & mover | AMC-team | AMC-team |
| [YARN-10391](https://issues.apache.org/jira/browse/YARN-10391) | --module-gpu functionality is broken in container-executor | Major | nodemanager | Eric Badger | Eric Badger |
| [HADOOP-17122](https://issues.apache.org/jira/browse/HADOOP-17122) | Bug in preserving Directory Attributes in DistCp with Atomic Copy | Major | tools/distcp | Swaminathan Balachandran | |
| [HDFS-14504](https://issues.apache.org/jira/browse/HDFS-14504) | Rename with Snapshots does not honor quota limit | Major | . | Shashikant Banerjee | Hemanth Boyina |
| [HADOOP-17209](https://issues.apache.org/jira/browse/HADOOP-17209) | Erasure Coding: Native library memory leak | Major | native | Sean Chow | Sean Chow |
| [HADOOP-16925](https://issues.apache.org/jira/browse/HADOOP-16925) | MetricsConfig incorrectly loads the configuration whose value is String list in the properties file | Major | metrics | Jiayi Liu | Jiayi Liu |
| [HADOOP-17220](https://issues.apache.org/jira/browse/HADOOP-17220) | Upgrade slf4j to 1.7.30 ( To Address: CVE-2018-8088) | Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-14852](https://issues.apache.org/jira/browse/HDFS-14852) | Removing from LowRedundancyBlocks does not remove the block from all queues | Major | namenode | Hui Fei | Hui Fei |
| [HDFS-15536](https://issues.apache.org/jira/browse/HDFS-15536) | RBF: Clear Quota in Router was not consistent | Critical | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15510](https://issues.apache.org/jira/browse/HDFS-15510) | RBF: Quota and Content Summary was not correct in Multiple Destinations | Critical | . | Hemanth Boyina | Hemanth Boyina |
| [HDFS-15540](https://issues.apache.org/jira/browse/HDFS-15540) | Directories protected from delete can still be moved to the trash | Major | namenode | Stephen O'Donnell | Stephen O'Donnell |
| [HADOOP-17129](https://issues.apache.org/jira/browse/HADOOP-17129) | Validating storage keys in ABFS correctly | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [HDFS-15471](https://issues.apache.org/jira/browse/HDFS-15471) | TestHDFSContractMultipartUploader fails on trunk | Major | test | Ahmed Hussein | Steve Loughran |
| [HDFS-15290](https://issues.apache.org/jira/browse/HDFS-15290) | NPE in HttpServer during NameNode startup | Major | namenode | Konstantin Shvachko | Simbarashe Dzinamarira |
| [HADOOP-17158](https://issues.apache.org/jira/browse/HADOOP-17158) | Test timeout for ITestAbfsInputStreamStatistics#testReadAheadCounters | Major | fs/azure | Mehakmeet Singh | Mehakmeet Singh |
| [HADOOP-17229](https://issues.apache.org/jira/browse/HADOOP-17229) | Test failure as failed request body counted in byte received metric - ITestAbfsNetworkStatistics#testAbfsHttpResponseStatistics | Major | fs/azure, test | Sneha Vijayarajan | Mehakmeet Singh |
| [YARN-10397](https://issues.apache.org/jira/browse/YARN-10397) | SchedulerRequest should be forwarded to scheduler if custom scheduler supports placement constraints | Minor | . | Bilwa S T | Bilwa S T |
| [HDFS-15573](https://issues.apache.org/jira/browse/HDFS-15573) | Only log warning if considerLoad and considerStorageType are both true | Major | . | Stephen O'Donnell | Stephen O'Donnell |
| [YARN-10430](https://issues.apache.org/jira/browse/YARN-10430) | Log improvements in NodeStatusUpdaterImpl | Minor | nodemanager | Bilwa S T | Bilwa S T |
| [HADOOP-17246](https://issues.apache.org/jira/browse/HADOOP-17246) | Fix build the hadoop-build Docker image failed | Major | build | Wanqiang Ji | Wanqiang Ji |
| [HDFS-15438](https://issues.apache.org/jira/browse/HDFS-15438) | Setting dfs.disk.balancer.max.disk.errors = 0 will fail the block copy | Major | balancer & mover | AMC-team | AMC-team |
| [HADOOP-15136](https://issues.apache.org/jira/browse/HADOOP-15136) | Typo in rename spec pseudocode | Major | documentation | Rae Marks | |
| [HADOOP-17088](https://issues.apache.org/jira/browse/HADOOP-17088) | Failed to load XInclude files with relative path. | Minor | conf | Yushi Hayasaka | Yushi Hayasaka |
| [MAPREDUCE-7294](https://issues.apache.org/jira/browse/MAPREDUCE-7294) | Only application master should upload resource to Yarn Shared Cache | Major | mrv2 | zhenzhao wang | zhenzhao wang |
| [HADOOP-17277](https://issues.apache.org/jira/browse/HADOOP-17277) | Correct spelling errors for separator | Trivial | common | Hui Fei | Hui Fei |
| [HADOOP-17286](https://issues.apache.org/jira/browse/HADOOP-17286) | Upgrade to jQuery 3.5.1 in hadoop-yarn-common | Major | . | Wei-Chiu Chuang | Aryan Gupta |
| [HDFS-15591](https://issues.apache.org/jira/browse/HDFS-15591) | RBF: Fix webHdfs file display error | Major | . | wangzhaohui | wangzhaohui |
| [MAPREDUCE-7289](https://issues.apache.org/jira/browse/MAPREDUCE-7289) | Fix wrong comment in LongLong.java | Trivial | documentation, examples | Akira Ajisaka | Wanqiang Ji |
| [YARN-9809](https://issues.apache.org/jira/browse/YARN-9809) | NMs should supply a health status when registering with RM | Major | . | Eric Badger | Eric Badger |
| [HADOOP-17300](https://issues.apache.org/jira/browse/HADOOP-17300) | FileSystem.DirListingIterator.next() call should return NoSuchElementException | Major | common, fs | Mukund Thakur | Mukund Thakur |
| [YARN-10393](https://issues.apache.org/jira/browse/YARN-10393) | MR job live lock caused by completed state container leak in heartbeat between node manager and RM | Major | nodemanager, yarn | zhenzhao wang | Jim Brennan |
| [HDFS-15253](https://issues.apache.org/jira/browse/HDFS-15253) | Set default throttle value on dfs.image.transfer.bandwidthPerSec | Major | namenode | Karthik Palanisamy | Karthik Palanisamy |
| [HDFS-15610](https://issues.apache.org/jira/browse/HDFS-15610) | Reduce datanode upgrade/hardlink thread | Major | datanode | Karthik Palanisamy | Karthik Palanisamy |
| [YARN-10455](https://issues.apache.org/jira/browse/YARN-10455) | TestNMProxy.testNMProxyRPCRetry is not consistent | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15456](https://issues.apache.org/jira/browse/HDFS-15456) | TestExternalStoragePolicySatisfier fails intermittently | Major | . | Ahmed Hussein | Leon Gao |
| [HADOOP-17223](https://issues.apache.org/jira/browse/HADOOP-17223) | update org.apache.httpcomponents:httpclient to 4.5.13 and httpcore to 4.4.13 | Blocker | . | Pranav Bheda | Pranav Bheda |
| [HDFS-15628](https://issues.apache.org/jira/browse/HDFS-15628) | HttpFS server throws NPE if a file is a symlink | Major | fs, httpfs | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15627](https://issues.apache.org/jira/browse/HDFS-15627) | Audit log deletes before collecting blocks | Major | logging, namenode | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17309](https://issues.apache.org/jira/browse/HADOOP-17309) | Javadoc warnings and errors are ignored in the precommit jobs | Major | build, documentation | Akira Ajisaka | Akira Ajisaka |
| [HDFS-14383](https://issues.apache.org/jira/browse/HDFS-14383) | Compute datanode load based on StoragePolicy | Major | hdfs, namenode | Karthik Palanisamy | Ayush Saxena |
| [HADOOP-17310](https://issues.apache.org/jira/browse/HADOOP-17310) | Touch command with -c option is broken | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15626](https://issues.apache.org/jira/browse/HDFS-15626) | TestWebHDFS.testLargeDirectory failing | Major | test, webhdfs | Mukund Thakur | Mukund Thakur |
| [HADOOP-17298](https://issues.apache.org/jira/browse/HADOOP-17298) | Backslash in username causes build failure in the environment started by start-build-env.sh. | Minor | build | Takeru Kuramoto | Takeru Kuramoto |
| [HDFS-15639](https://issues.apache.org/jira/browse/HDFS-15639) | [JDK 11] Fix Javadoc errors in hadoop-hdfs-client | Major | . | Takanobu Asanuma | Takanobu Asanuma |
| [HDFS-15622](https://issues.apache.org/jira/browse/HDFS-15622) | Deleted blocks linger in the replications queue | Major | hdfs | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17308](https://issues.apache.org/jira/browse/HADOOP-17308) | WASB : PageBlobOutputStream succeeding hflush even when underlying flush to storage failed | Critical | . | Anoop Sam John | Anoop Sam John |
| [HDFS-15641](https://issues.apache.org/jira/browse/HDFS-15641) | DataNode could meet deadlock if invoke refreshNameNode | Critical | . | Hongbing Wang | Hongbing Wang |
| [HADOOP-17328](https://issues.apache.org/jira/browse/HADOOP-17328) | LazyPersist Overwrite fails in direct write mode | Major | . | Ayush Saxena | Ayush Saxena |
| [MAPREDUCE-7302](https://issues.apache.org/jira/browse/MAPREDUCE-7302) | Upgrading to JUnit 4.13 causes testcase TestFetcher.testCorruptedIFile() to fail | Major | test | Peter Bacsko | Peter Bacsko |
| [HDFS-15644](https://issues.apache.org/jira/browse/HDFS-15644) | Failed volumes can cause DNs to stop block reporting | Major | block placement, datanode | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17236](https://issues.apache.org/jira/browse/HADOOP-17236) | Bump up snakeyaml to 1.26 to mitigate CVE-2017-18640 | Major | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-10467](https://issues.apache.org/jira/browse/YARN-10467) | ContainerIdPBImpl objects can be leaked in RMNodeImpl.completedContainers | Major | resourcemanager | Haibo Chen | Haibo Chen |
| [HADOOP-17329](https://issues.apache.org/jira/browse/HADOOP-17329) | mvn site commands fails due to MetricsSystemImpl changes | Major | . | Xiaoqiao He | Xiaoqiao He |
| [HDFS-15651](https://issues.apache.org/jira/browse/HDFS-15651) | Client could not obtain block when DN CommandProcessingThread exit | Major | . | Yiqun Lin | Aiphago |
| [HADOOP-17340](https://issues.apache.org/jira/browse/HADOOP-17340) | TestLdapGroupsMapping failing -string mismatch in exception validation | Major | test | Steve Loughran | Steve Loughran |
| [HDFS-15667](https://issues.apache.org/jira/browse/HDFS-15667) | Audit log record the unexpected allowed result when delete called | Major | hdfs | Baolong Mao | Baolong Mao |
| [HADOOP-17352](https://issues.apache.org/jira/browse/HADOOP-17352) | Update PATCH\_NAMING\_RULE in the personality file | Minor | build | Akira Ajisaka | Akira Ajisaka |
| [YARN-10458](https://issues.apache.org/jira/browse/YARN-10458) | Hive On Tez queries fails upon submission to dynamically created pools | Major | resourcemanager | Anand Srinivasan | Peter Bacsko |
| [HDFS-15485](https://issues.apache.org/jira/browse/HDFS-15485) | Fix outdated properties of JournalNode when performing rollback | Minor | . | Deegue | Deegue |
| [HADOOP-17096](https://issues.apache.org/jira/browse/HADOOP-17096) | ZStandardCompressor throws java.lang.InternalError: Error (generic) | Major | io | Stephen Jung (Stripe) | Stephen Jung (Stripe) |
| [HADOOP-17327](https://issues.apache.org/jira/browse/HADOOP-17327) | NPE when starting MiniYARNCluster from hadoop-client-minicluster | Critical | . | Chao Sun | |
| [HADOOP-17324](https://issues.apache.org/jira/browse/HADOOP-17324) | Don't relocate org.bouncycastle in shaded client jars | Critical | . | Chao Sun | Chao Sun |
| [HADOOP-17373](https://issues.apache.org/jira/browse/HADOOP-17373) | hadoop-client-integration-tests doesn't work when building with skipShade | Major | . | Chao Sun | Chao Sun |
| [HADOOP-17365](https://issues.apache.org/jira/browse/HADOOP-17365) | Contract test for renaming over existing file is too lenient | Minor | test | Attila Doroszlai | Attila Doroszlai |
| [HADOOP-17358](https://issues.apache.org/jira/browse/HADOOP-17358) | Improve excessive reloading of Configurations | Major | conf | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15538](https://issues.apache.org/jira/browse/HDFS-15538) | Fix the documentation for dfs.namenode.replication.max-streams in hdfs-default.xml | Major | . | Xieming Li | Xieming Li |
| [HADOOP-17362](https://issues.apache.org/jira/browse/HADOOP-17362) | Doing hadoop ls on Har file triggers too many RPC calls | Major | fs | Ahmed Hussein | Ahmed Hussein |
| [YARN-10485](https://issues.apache.org/jira/browse/YARN-10485) | TimelineConnector swallows InterruptedException | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17360](https://issues.apache.org/jira/browse/HADOOP-17360) | Log the remote address for authentication success | Minor | ipc | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15685](https://issues.apache.org/jira/browse/HDFS-15685) | [JDK 14] TestConfiguredFailoverProxyProvider#testResolveDomainNameUsingDNS fails | Major | . | Akira Ajisaka | Akira Ajisaka |
| [MAPREDUCE-7305](https://issues.apache.org/jira/browse/MAPREDUCE-7305) | [JDK 11] TestMRJobsWithProfiler fails | Major | test | Akira Ajisaka | Akira Ajisaka |
| [YARN-10396](https://issues.apache.org/jira/browse/YARN-10396) | Max applications calculation per queue disregards queue level settings in absolute mode | Major | capacity scheduler | Benjamin Teke | Benjamin Teke |
| [HADOOP-17390](https://issues.apache.org/jira/browse/HADOOP-17390) | Skip license check on lz4 code files | Major | build | Zhihua Deng | Zhihua Deng |
| [MAPREDUCE-7307](https://issues.apache.org/jira/browse/MAPREDUCE-7307) | Potential thread leak in LocatedFileStatusFetcher | Major | job submission | Zhihua Deng | Zhihua Deng |
| [HADOOP-17346](https://issues.apache.org/jira/browse/HADOOP-17346) | Fair call queue is defeated by abusive service principals | Major | common, ipc | Ahmed Hussein | Ahmed Hussein |
| [YARN-10470](https://issues.apache.org/jira/browse/YARN-10470) | When building new web ui with root user, the bower install should support it. | Major | build, yarn-ui-v2 | Qi Zhu | Qi Zhu |
| [HADOOP-17398](https://issues.apache.org/jira/browse/HADOOP-17398) | Skipping network I/O in S3A getFileStatus(/) breaks some tests | Major | fs/s3, test | Mukund Thakur | Mukund Thakur |
| [HDFS-15698](https://issues.apache.org/jira/browse/HDFS-15698) | Fix the typo of dfshealth.html after HDFS-15358 | Trivial | namenode | Hui Fei | Hui Fei |
| [YARN-10498](https://issues.apache.org/jira/browse/YARN-10498) | Fix Yarn CapacityScheduler Markdown document | Trivial | documentation | zhaoshengjie | zhaoshengjie |
| [HADOOP-17399](https://issues.apache.org/jira/browse/HADOOP-17399) | lz4 sources missing for native Visual Studio project | Major | native | Gautham Banasandra | Gautham Banasandra |
| [HDFS-15695](https://issues.apache.org/jira/browse/HDFS-15695) | NN should not let the balancer run in safemode | Major | namenode | Ahmed Hussein | Ahmed Hussein |
| [YARN-10511](https://issues.apache.org/jira/browse/YARN-10511) | Update yarn.nodemanager.env-whitelist value in docs | Minor | documentation | Andrea Scarpino | Andrea Scarpino |
| [HADOOP-16080](https://issues.apache.org/jira/browse/HADOOP-16080) | hadoop-aws does not work with hadoop-client-api | Major | fs/s3 | Keith Turner | Chao Sun |
| [HDFS-15660](https://issues.apache.org/jira/browse/HDFS-15660) | StorageTypeProto is not compatiable between 3.x and 2.6 | Major | . | Ryan Wu | Ryan Wu |
| [HDFS-15707](https://issues.apache.org/jira/browse/HDFS-15707) | NNTop counts don't add up as expected | Major | hdfs, metrics, namenode | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15709](https://issues.apache.org/jira/browse/HDFS-15709) | EC: Socket file descriptor leak in StripedBlockChecksumReconstructor | Major | datanode, ec, erasure-coding | Yushi Hayasaka | Yushi Hayasaka |
| [YARN-10495](https://issues.apache.org/jira/browse/YARN-10495) | make the rpath of container-executor configurable | Major | yarn | angerszhu | angerszhu |
| [HDFS-15240](https://issues.apache.org/jira/browse/HDFS-15240) | Erasure Coding: dirty buffer causes reconstruction block error | Blocker | datanode, erasure-coding | HuangTao | HuangTao |
| [YARN-10491](https://issues.apache.org/jira/browse/YARN-10491) | Fix deprecation warnings in SLSWebApp.java | Minor | build | Akira Ajisaka | Ankit Kumar |
| [HADOOP-13571](https://issues.apache.org/jira/browse/HADOOP-13571) | ServerSocketUtil.getPort() should use loopback address, not 0.0.0.0 | Major | . | Eric Badger | Eric Badger |
| [HDFS-15725](https://issues.apache.org/jira/browse/HDFS-15725) | Lease Recovery never completes for a committed block which the DNs never finalize | Major | namenode | Stephen O'Donnell | Stephen O'Donnell |
| [HDFS-15170](https://issues.apache.org/jira/browse/HDFS-15170) | EC: Block gets marked as CORRUPT in case of failover and pipeline recovery | Critical | erasure-coding | Ayush Saxena | Ayush Saxena |
| [YARN-10536](https://issues.apache.org/jira/browse/YARN-10536) | Client in distributedShell swallows interrupt exceptions | Major | client, distributed-shell | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15743](https://issues.apache.org/jira/browse/HDFS-15743) | Fix -Pdist build failure of hadoop-hdfs-native-client | Major | . | Masatake Iwasaki | Masatake Iwasaki |
| [YARN-10334](https://issues.apache.org/jira/browse/YARN-10334) | TestDistributedShell leaks resources on timeout/failure | Major | distributed-shell, test, yarn | Ahmed Hussein | Ahmed Hussein |
| [YARN-10558](https://issues.apache.org/jira/browse/YARN-10558) | Fix failure of TestDistributedShell#testDSShellWithOpportunisticContainers | Minor | test | Masatake Iwasaki | Masatake Iwasaki |
| [HDFS-15719](https://issues.apache.org/jira/browse/HDFS-15719) | [Hadoop 3] Both NameNodes can crash simultaneously due to the short JN socket timeout | Critical | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-10560](https://issues.apache.org/jira/browse/YARN-10560) | Upgrade node.js to 10.23.1 and yarn to 1.22.5 in Web UI v2 | Major | webapp, yarn-ui-v2 | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17444](https://issues.apache.org/jira/browse/HADOOP-17444) | ADLFS: Update SDK version from 2.3.6 to 2.3.9 | Minor | fs/adl | Bilahari T H | Bilahari T H |
| [YARN-10528](https://issues.apache.org/jira/browse/YARN-10528) | maxAMShare should only be accepted for leaf queues, not parent queues | Major | . | Siddharth Ahuja | Siddharth Ahuja |
| [HADOOP-17438](https://issues.apache.org/jira/browse/HADOOP-17438) | Increase docker memory limit in Jenkins | Major | build, scripts, test, yetus | Ahmed Hussein | Ahmed Hussein |
| [MAPREDUCE-7310](https://issues.apache.org/jira/browse/MAPREDUCE-7310) | Clear the fileMap in JHEventHandlerForSigtermTest | Minor | test | Zhengxi Li | Zhengxi Li |
| [HADOOP-16947](https://issues.apache.org/jira/browse/HADOOP-16947) | Stale record should be remove when MutableRollingAverages generating aggregate data. | Major | . | Haibin Huang | Haibin Huang |
| [YARN-10515](https://issues.apache.org/jira/browse/YARN-10515) | Fix flaky test TestCapacitySchedulerAutoQueueCreation.testDynamicAutoQueueCreationWithTags | Major | test | Peter Bacsko | Peter Bacsko |
| [HADOOP-17224](https://issues.apache.org/jira/browse/HADOOP-17224) | Install Intel ISA-L library in Dockerfile | Blocker | . | Takanobu Asanuma | Takanobu Asanuma |
| [HDFS-15632](https://issues.apache.org/jira/browse/HDFS-15632) | AbstractContractDeleteTest should set recursive parameter to true for recursive test cases. | Major | . | Konstantin Shvachko | Anton Kutuzov |
| [HADOOP-17258](https://issues.apache.org/jira/browse/HADOOP-17258) | MagicS3GuardCommitter fails with \`pendingset\` already exists | Major | fs/s3 | Dongjoon Hyun | Dongjoon Hyun |
| [HDFS-15661](https://issues.apache.org/jira/browse/HDFS-15661) | The DeadNodeDetector shouldn't be shared by different DFSClients. | Major | . | Jinglun | Jinglun |
| [HDFS-10498](https://issues.apache.org/jira/browse/HDFS-10498) | Intermittent test failure org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotFileLength.testSnapshotfileLength | Major | hdfs, snapshots | Hanisha Koneru | Jim Brennan |
| [HADOOP-17506](https://issues.apache.org/jira/browse/HADOOP-17506) | Fix typo in BUILDING.txt | Trivial | documentation | Gautham Banasandra | Gautham Banasandra |
| [HDFS-15791](https://issues.apache.org/jira/browse/HDFS-15791) | Possible Resource Leak in FSImageFormatProtobuf | Major | namenode | Narges Shadab | Narges Shadab |
| [HDFS-15795](https://issues.apache.org/jira/browse/HDFS-15795) | EC: Wrong checksum when reconstruction was failed by exception | Major | datanode, ec, erasure-coding | Yushi Hayasaka | Yushi Hayasaka |
| [HDFS-15779](https://issues.apache.org/jira/browse/HDFS-15779) | EC: fix NPE caused by StripedWriter.clearBuffers during reconstruct block | Major | . | Hongbing Wang | Hongbing Wang |
| [HADOOP-17217](https://issues.apache.org/jira/browse/HADOOP-17217) | S3A FileSystem does not correctly delete directories with fake entries | Major | fs/s3 | Kaya Kupferschmidt | |
| [HDFS-15798](https://issues.apache.org/jira/browse/HDFS-15798) | EC: Reconstruct task failed, and It would be XmitsInProgress of DN has negative number | Major | . | Haiyang Hu | Haiyang Hu |
| [YARN-10607](https://issues.apache.org/jira/browse/YARN-10607) | User environment is unable to prepend PATH when mapreduce.admin.user.env also sets PATH | Major | . | Eric Badger | Eric Badger |
| [HDFS-15792](https://issues.apache.org/jira/browse/HDFS-15792) | ClasscastException while loading FSImage | Major | nn | Renukaprasad C | Renukaprasad C |
| [HADOOP-17516](https://issues.apache.org/jira/browse/HADOOP-17516) | Upgrade ant to 1.10.9 | Major | . | Akira Ajisaka | Akira Ajisaka |
| [YARN-10500](https://issues.apache.org/jira/browse/YARN-10500) | TestDelegationTokenRenewer fails intermittently | Major | test | Akira Ajisaka | Masatake Iwasaki |
| [HDFS-15806](https://issues.apache.org/jira/browse/HDFS-15806) | DeadNodeDetector should close all the threads when it is closed. | Major | . | Jinglun | Jinglun |
| [HADOOP-17534](https://issues.apache.org/jira/browse/HADOOP-17534) | Upgrade Jackson databind to 2.10.5.1 | Major | build | Adam Roberts | Akira Ajisaka |
| [MAPREDUCE-7323](https://issues.apache.org/jira/browse/MAPREDUCE-7323) | Remove job\_history\_summary.py | Major | . | Akira Ajisaka | Akira Ajisaka |
| [YARN-10647](https://issues.apache.org/jira/browse/YARN-10647) | Fix TestRMNodeLabelsManager failed after YARN-10501. | Major | . | Qi Zhu | Qi Zhu |
| [HADOOP-17528](https://issues.apache.org/jira/browse/HADOOP-17528) | Not closing an SFTP File System instance prevents JVM from exiting. | Major | . | Mikhail Pryakhin | Mikhail Pryakhin |
| [HADOOP-17510](https://issues.apache.org/jira/browse/HADOOP-17510) | Hadoop prints sensitive Cookie information. | Major | . | Renukaprasad C | Renukaprasad C |
| [HDFS-15422](https://issues.apache.org/jira/browse/HDFS-15422) | Reported IBR is partially replaced with stored info when queuing. | Critical | namenode | Kihwal Lee | Stephen O'Donnell |
| [YARN-10651](https://issues.apache.org/jira/browse/YARN-10651) | CapacityScheduler crashed with NPE in AbstractYarnScheduler.updateNodeResource() | Major | . | Haibo Chen | Haibo Chen |
| [MAPREDUCE-7320](https://issues.apache.org/jira/browse/MAPREDUCE-7320) | ClusterMapReduceTestCase does not clean directories | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HDFS-14013](https://issues.apache.org/jira/browse/HDFS-14013) | Skip any credentials stored in HDFS when starting ZKFC | Major | hdfs | Krzysztof Adamski | Stephen O'Donnell |
| [HDFS-15849](https://issues.apache.org/jira/browse/HDFS-15849) | ExpiredHeartbeats metric should be of Type.COUNTER | Major | metrics | Konstantin Shvachko | Qi Zhu |
| [YARN-10649](https://issues.apache.org/jira/browse/YARN-10649) | Fix RMNodeImpl.updateExistContainers leak | Major | resourcemanager | Max Xie | Max Xie |
| [YARN-10672](https://issues.apache.org/jira/browse/YARN-10672) | All testcases in TestReservations are flaky | Major | . | Szilard Nemeth | Szilard Nemeth |
| [HADOOP-17557](https://issues.apache.org/jira/browse/HADOOP-17557) | skip-dir option is not processed by Yetus | Major | build, precommit, yetus | Ahmed Hussein | Ahmed Hussein |
| [YARN-10671](https://issues.apache.org/jira/browse/YARN-10671) | Fix Typo in TestSchedulingRequestContainerAllocation | Minor | . | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [HDFS-15875](https://issues.apache.org/jira/browse/HDFS-15875) | Check whether file is being truncated before truncate | Major | . | Hui Fei | Hui Fei |
| [HADOOP-17582](https://issues.apache.org/jira/browse/HADOOP-17582) | Replace GitHub App Token with GitHub OAuth token | Major | build | Akira Ajisaka | Akira Ajisaka |
| [YARN-10687](https://issues.apache.org/jira/browse/YARN-10687) | Add option to disable/enable free disk space checking and percentage checking for full and not-full disks | Major | nodemanager | Qi Zhu | Qi Zhu |
| [HADOOP-17586](https://issues.apache.org/jira/browse/HADOOP-17586) | Upgrade org.codehaus.woodstox:stax2-api to 4.2.1 | Major | . | Ayush Saxena | Ayush Saxena |
| [HADOOP-17585](https://issues.apache.org/jira/browse/HADOOP-17585) | Correct timestamp format in the docs for the touch command | Major | . | Stephen O'Donnell | Stephen O'Donnell |
| [HDFS-15809](https://issues.apache.org/jira/browse/HDFS-15809) | DeadNodeDetector doesn't remove live nodes from dead node set. | Major | . | Jinglun | Jinglun |
| [HADOOP-17532](https://issues.apache.org/jira/browse/HADOOP-17532) | Yarn Job execution get failed when LZ4 Compression Codec is used | Major | common | Bhavik Patel | Bhavik Patel |
| [YARN-10588](https://issues.apache.org/jira/browse/YARN-10588) | Percentage of queue and cluster is zero in WebUI | Major | . | Bilwa S T | Bilwa S T |
| [MAPREDUCE-7322](https://issues.apache.org/jira/browse/MAPREDUCE-7322) | revisiting TestMRIntermediateDataEncryption | Major | job submission, security, test | Ahmed Hussein | Ahmed Hussein |
| [YARN-10703](https://issues.apache.org/jira/browse/YARN-10703) | Fix potential null pointer error of gpuNodeResourceUpdateHandler in NodeResourceMonitorImpl. | Major | . | Qi Zhu | Qi Zhu |
| [HDFS-15868](https://issues.apache.org/jira/browse/HDFS-15868) | Possible Resource Leak in EditLogFileOutputStream | Major | . | Narges Shadab | Narges Shadab |
| [HADOOP-17592](https://issues.apache.org/jira/browse/HADOOP-17592) | Fix the wrong CIDR range example in Proxy User documentation | Minor | documentation | Kwangsun Noh | Kwangsun Noh |
| [YARN-10706](https://issues.apache.org/jira/browse/YARN-10706) | Upgrade com.github.eirslett:frontend-maven-plugin to 1.11.2 | Major | buid | Mingliang Liu | Mingliang Liu |
| [MAPREDUCE-7325](https://issues.apache.org/jira/browse/MAPREDUCE-7325) | Intermediate data encryption is broken in LocalJobRunner | Major | job submission, security | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15908](https://issues.apache.org/jira/browse/HDFS-15908) | Possible Resource Leak in org.apache.hadoop.hdfs.qjournal.server.Journal | Major | . | Narges Shadab | Narges Shadab |
| [HDFS-15910](https://issues.apache.org/jira/browse/HDFS-15910) | Replace bzero with explicit\_bzero for better safety | Critical | libhdfs++ | Gautham Banasandra | Gautham Banasandra |
| [YARN-10697](https://issues.apache.org/jira/browse/YARN-10697) | Resources are displayed in bytes in UI for schedulers other than capacity | Major | . | Bilwa S T | Bilwa S T |
| [HADOOP-17602](https://issues.apache.org/jira/browse/HADOOP-17602) | Upgrade JUnit to 4.13.1 | Major | build, security, test | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15900](https://issues.apache.org/jira/browse/HDFS-15900) | RBF: empty blockpool id on dfsrouter caused by UNAVAILABLE NameNode | Major | rbf | Harunobu Daikoku | Harunobu Daikoku |
| [YARN-10501](https://issues.apache.org/jira/browse/YARN-10501) | Can't remove all node labels after add node label without nodemanager port | Critical | yarn | caozhiqiang | caozhiqiang |
| [YARN-10437](https://issues.apache.org/jira/browse/YARN-10437) | Destroy yarn service if any YarnException occurs during submitApp | Minor | yarn-native-services | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [YARN-10439](https://issues.apache.org/jira/browse/YARN-10439) | Yarn Service AM listens on all IP's on the machine | Minor | security, yarn-native-services | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [YARN-10441](https://issues.apache.org/jira/browse/YARN-10441) | Add support for hadoop.http.rmwebapp.scheduler.page.class | Major | scheduler | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [YARN-10466](https://issues.apache.org/jira/browse/YARN-10466) | Fix NullPointerException in yarn-services Component.java | Minor | . | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [YARN-10716](https://issues.apache.org/jira/browse/YARN-10716) | Fix typo in ContainerRuntime | Trivial | documentation | Wanqiang Ji | xishuhai |
| [HDFS-15494](https://issues.apache.org/jira/browse/HDFS-15494) | TestReplicaCachingGetSpaceUsed#testReplicaCachingGetSpaceUsedByRBWReplica Fails on Windows | Major | . | Ravuri Sushma sree | Ravuri Sushma sree |
| [HADOOP-17610](https://issues.apache.org/jira/browse/HADOOP-17610) | DelegationTokenAuthenticator prints token information | Major | . | Ravuri Sushma sree | Ravuri Sushma sree |
| [HADOOP-17587](https://issues.apache.org/jira/browse/HADOOP-17587) | Kinit with keytab should not display the keytab file's full path in any logs | Major | . | Ravuri Sushma sree | Ravuri Sushma sree |
| [HDFS-15950](https://issues.apache.org/jira/browse/HDFS-15950) | Remove unused hdfs.proto import | Major | hdfs-client | Gautham Banasandra | Gautham Banasandra |
| [HDFS-15940](https://issues.apache.org/jira/browse/HDFS-15940) | Some tests in TestBlockRecovery are consistently failing | Major | . | Viraj Jasani | Viraj Jasani |
| [HDFS-15949](https://issues.apache.org/jira/browse/HDFS-15949) | Fix integer overflow | Major | libhdfs++ | Gautham Banasandra | Gautham Banasandra |
| [HADOOP-17621](https://issues.apache.org/jira/browse/HADOOP-17621) | hadoop-auth to remove jetty-server dependency | Major | auth | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-15948](https://issues.apache.org/jira/browse/HDFS-15948) | Fix test4tests for libhdfspp | Critical | build, libhdfs++ | Gautham Banasandra | Gautham Banasandra |
| [HADOOP-17617](https://issues.apache.org/jira/browse/HADOOP-17617) | Incorrect representation of RESPONSE for Get Key Version in KMS index.md.vm file | Major | . | Ravuri Sushma sree | Ravuri Sushma sree |
| [MAPREDUCE-7329](https://issues.apache.org/jira/browse/MAPREDUCE-7329) | HadoopPipes task may fail when linux kernel version change from 3.x to 4.x | Major | pipes | chaoli | chaoli |
| [HADOOP-17608](https://issues.apache.org/jira/browse/HADOOP-17608) | Fix TestKMS failure | Major | kms | Akira Ajisaka | Akira Ajisaka |
| [HDFS-15963](https://issues.apache.org/jira/browse/HDFS-15963) | Unreleased volume references cause an infinite loop | Major | datanode | Shuyan Zhang | Shuyan Zhang |
| [YARN-10460](https://issues.apache.org/jira/browse/YARN-10460) | Upgrading to JUnit 4.13 causes tests in TestNodeStatusUpdater to fail | Major | nodemanager, test | Peter Bacsko | Peter Bacsko |
| [HADOOP-17641](https://issues.apache.org/jira/browse/HADOOP-17641) | ITestWasbUriAndConfiguration.testCanonicalServiceName() failing now mockaccount exists | Minor | fs/azure, test | Steve Loughran | Steve Loughran |
| [HDFS-15974](https://issues.apache.org/jira/browse/HDFS-15974) | RBF: Unable to display the datanode UI of the router | Major | rbf, ui | Xiangyi Zhu | Xiangyi Zhu |
| [HADOOP-17655](https://issues.apache.org/jira/browse/HADOOP-17655) | Upgrade Jetty to 9.4.40 | Blocker | . | Akira Ajisaka | Akira Ajisaka |
| [YARN-10749](https://issues.apache.org/jira/browse/YARN-10749) | Can't remove all node labels after add node label without nodemanager port, broken by YARN-10647 | Major | . | D M Murali Krishna Reddy | D M Murali Krishna Reddy |
| [HDFS-15566](https://issues.apache.org/jira/browse/HDFS-15566) | NN restart fails after RollingUpgrade from 3.1.3/3.2.1 to 3.3.0 | Blocker | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-15621](https://issues.apache.org/jira/browse/HDFS-15621) | Datanode DirectoryScanner uses excessive memory | Major | datanode | Stephen O'Donnell | Stephen O'Donnell |
| [YARN-10752](https://issues.apache.org/jira/browse/YARN-10752) | Shaded guava not found when compiling with profile hbase2.0 | Blocker | timelineserver | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-15865](https://issues.apache.org/jira/browse/HDFS-15865) | Interrupt DataStreamer thread | Minor | datanode | Karthik Palanisamy | |
| [HDFS-15810](https://issues.apache.org/jira/browse/HDFS-15810) | RBF: RBFMetrics's TotalCapacity out of bounds | Major | . | Xiaoxing Wei | Fengnan Li |
| [HADOOP-17657](https://issues.apache.org/jira/browse/HADOOP-17657) | SequeneFile.Writer should implement StreamCapabilities | Major | . | Kishen Das | Kishen Das |
| [YARN-10756](https://issues.apache.org/jira/browse/YARN-10756) | Remove additional junit 4.11 dependency from javadoc | Major | build, test, timelineservice | ANANDA G B | Akira Ajisaka |
| [HADOOP-17375](https://issues.apache.org/jira/browse/HADOOP-17375) | Fix the error of TestDynamometerInfra | Major | test | Akira Ajisaka | Takanobu Asanuma |
| [HDFS-16001](https://issues.apache.org/jira/browse/HDFS-16001) | TestOfflineEditsViewer.testStored() fails reading negative value of FSEditLogOpCodes | Blocker | hdfs | Konstantin Shvachko | Akira Ajisaka |
| [HADOOP-17142](https://issues.apache.org/jira/browse/HADOOP-17142) | Fix outdated properties of journal node when perform rollback | Minor | . | Deegue | |
| [HADOOP-17107](https://issues.apache.org/jira/browse/HADOOP-17107) | hadoop-azure parallel tests not working on recent JDKs | Major | build, fs/azure | Steve Loughran | Steve Loughran |
| [YARN-10555](https://issues.apache.org/jira/browse/YARN-10555) | Missing access check before getAppAttempts | Critical | webapp | lujie | lujie |
| [HADOOP-17703](https://issues.apache.org/jira/browse/HADOOP-17703) | checkcompatibility.py errors out when specifying annotations | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-16027](https://issues.apache.org/jira/browse/HDFS-16027) | HDFS-15245 breaks source code compatibility between 3.3.0 and 3.3.1. | Blocker | journal-node, ui | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [YARN-10725](https://issues.apache.org/jira/browse/YARN-10725) | Backport YARN-10120 to branch-3.3 | Major | . | Bilwa S T | Bilwa S T |
| [YARN-10701](https://issues.apache.org/jira/browse/YARN-10701) | The yarn.resource-types should support multi types without trimmed. | Major | . | Qi Zhu | Qi Zhu |
| [HADOOP-17718](https://issues.apache.org/jira/browse/HADOOP-17718) | Explicitly set locale in the Dockerfile | Blocker | build | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [MAPREDUCE-7348](https://issues.apache.org/jira/browse/MAPREDUCE-7348) | TestFrameworkUploader#testNativeIO fails | Major | test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17723](https://issues.apache.org/jira/browse/HADOOP-17723) | [build] fix the Dockerfile for ARM | Blocker | build | Wei-Chiu Chuang | Wei-Chiu Chuang |
### TESTS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [MAPREDUCE-7288](https://issues.apache.org/jira/browse/MAPREDUCE-7288) | Fix TestLongLong#testRightShift | Minor | . | Wanqiang Ji | Wanqiang Ji |
| [HDFS-15514](https://issues.apache.org/jira/browse/HDFS-15514) | Remove useless dfs.webhdfs.enabled | Minor | test | Hui Fei | Hui Fei |
| [HADOOP-17205](https://issues.apache.org/jira/browse/HADOOP-17205) | Move personality file from Yetus to Hadoop repository | Major | test, yetus | Chao Sun | Chao Sun |
| [HDFS-15564](https://issues.apache.org/jira/browse/HDFS-15564) | Add Test annotation for TestPersistBlocks#testRestartDfsWithSync | Minor | hdfs | Hui Fei | Hui Fei |
| [YARN-9333](https://issues.apache.org/jira/browse/YARN-9333) | TestFairSchedulerPreemption.testRelaxLocalityPreemptionWithNoLessAMInRemainingNodes fails intermittently | Major | yarn | Prabhu Joseph | Peter Bacsko |
| [HDFS-15690](https://issues.apache.org/jira/browse/HDFS-15690) | Add lz4-java as hadoop-hdfs test dependency | Major | . | L. C. Hsieh | L. C. Hsieh |
| [HADOOP-17459](https://issues.apache.org/jira/browse/HADOOP-17459) | ADL Gen1: Fix the test case failures which are failing after the contract test update in hadoop-common | Minor | fs/adl | Bilahari T H | Bilahari T H |
| [HDFS-15898](https://issues.apache.org/jira/browse/HDFS-15898) | Test case TestOfflineImageViewer fails | Minor | . | Hui Fei | Hui Fei |
### SUB-TASKS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-16857](https://issues.apache.org/jira/browse/HADOOP-16857) | ABFS: Optimize HttpRequest retry triggers | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17002](https://issues.apache.org/jira/browse/HADOOP-17002) | ABFS: Avoid storage calls to check if the account is HNS enabled or not | Minor | fs/azure | Bilahari T H | Bilahari T H |
| [YARN-10215](https://issues.apache.org/jira/browse/YARN-10215) | Endpoint for obtaining direct URL for the logs | Major | yarn | Adam Antal | Andras Gyori |
| [HDFS-14353](https://issues.apache.org/jira/browse/HDFS-14353) | Erasure Coding: metrics xmitsInProgress become to negative. | Major | datanode, erasure-coding | Baolong Mao | Baolong Mao |
| [HDFS-15305](https://issues.apache.org/jira/browse/HDFS-15305) | Extend ViewFS and provide ViewFSOverloadScheme implementation with scheme configurable. | Major | fs, hadoop-client, hdfs-client, viewfs | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-10259](https://issues.apache.org/jira/browse/YARN-10259) | Reserved Containers not allocated from available space of other nodes in CandidateNodeSet in MultiNodePlacement | Major | capacityscheduler | Prabhu Joseph | Prabhu Joseph |
| [HDFS-15306](https://issues.apache.org/jira/browse/HDFS-15306) | Make mount-table to read from central place ( Let's say from HDFS) | Major | configuration, hadoop-client | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-16756](https://issues.apache.org/jira/browse/HADOOP-16756) | distcp -update to S3A; abfs, etc always overwrites due to block size mismatch | Major | fs/s3, tools/distcp | Daisuke Kobayashi | Steve Loughran |
| [HDFS-15322](https://issues.apache.org/jira/browse/HDFS-15322) | Make NflyFS to work when ViewFsOverloadScheme's scheme and target uris schemes are same. | Major | fs, nflyFs, viewfs, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-10108](https://issues.apache.org/jira/browse/YARN-10108) | FS-CS converter: nestedUserQueue with default rule results in invalid queue mapping | Major | . | Prabhu Joseph | Gergely Pollák |
| [HADOOP-16852](https://issues.apache.org/jira/browse/HADOOP-16852) | ABFS: Send error back to client for Read Ahead request failure | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17053](https://issues.apache.org/jira/browse/HADOOP-17053) | ABFS: FS initialize fails for incompatible account-agnostic Token Provider setting | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HDFS-15321](https://issues.apache.org/jira/browse/HDFS-15321) | Make DFSAdmin tool to work with ViewFSOverloadScheme | Major | dfsadmin, fs, viewfs | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-16568](https://issues.apache.org/jira/browse/HADOOP-16568) | S3A FullCredentialsTokenBinding fails if local credentials are unset | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-10284](https://issues.apache.org/jira/browse/YARN-10284) | Add lazy initialization of LogAggregationFileControllerFactory in LogServlet | Major | log-aggregation, yarn | Adam Antal | Adam Antal |
| [HDFS-15330](https://issues.apache.org/jira/browse/HDFS-15330) | Document the ViewFSOverloadScheme details in ViewFS guide | Major | viewfs, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15389](https://issues.apache.org/jira/browse/HDFS-15389) | DFSAdmin should close filesystem and dfsadmin -setBalancerBandwidth should work with ViewFSOverloadScheme | Major | dfsadmin, viewfsOverloadScheme | Ayush Saxena | Ayush Saxena |
| [HDFS-15394](https://issues.apache.org/jira/browse/HDFS-15394) | Add all available fs.viewfs.overload.scheme.target.\<scheme\>.impl classes in core-default.xml bydefault. | Major | configuration, viewfs, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15387](https://issues.apache.org/jira/browse/HDFS-15387) | FSUsage$DF should consider ViewFSOverloadScheme in processPath | Minor | viewfs | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-10292](https://issues.apache.org/jira/browse/YARN-10292) | FS-CS converter: add an option to enable asynchronous scheduling in CapacityScheduler | Major | fairscheduler | Benjamin Teke | Benjamin Teke |
| [HADOOP-17004](https://issues.apache.org/jira/browse/HADOOP-17004) | ABFS: Improve the ABFS driver documentation | Minor | fs/azure | Bilahari T H | Bilahari T H |
| [HDFS-15418](https://issues.apache.org/jira/browse/HDFS-15418) | ViewFileSystemOverloadScheme should represent mount links as non symlinks | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-9930](https://issues.apache.org/jira/browse/YARN-9930) | Support max running app logic for CapacityScheduler | Major | capacity scheduler, capacityscheduler | zhoukang | Peter Bacsko |
| [HDFS-15427](https://issues.apache.org/jira/browse/HDFS-15427) | Merged ListStatus with Fallback target filesystem and InternalDirViewFS. | Major | viewfs | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [YARN-10316](https://issues.apache.org/jira/browse/YARN-10316) | FS-CS converter: convert maxAppsDefault, maxRunningApps settings | Major | . | Peter Bacsko | Peter Bacsko |
| [HADOOP-17054](https://issues.apache.org/jira/browse/HADOOP-17054) | ABFS: Fix idempotency test failures when SharedKey is set as AuthType | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17050](https://issues.apache.org/jira/browse/HADOOP-17050) | S3A to support additional token issuers | Minor | fs/s3 | Gabor Bota | Steve Loughran |
| [HADOOP-17015](https://issues.apache.org/jira/browse/HADOOP-17015) | ABFS: Make PUT and POST operations idempotent | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HDFS-15429](https://issues.apache.org/jira/browse/HDFS-15429) | mkdirs should work when parent dir is internalDir and fallback configured. | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15436](https://issues.apache.org/jira/browse/HDFS-15436) | Default mount table name used by ViewFileSystem should be configurable | Major | viewfs, viewfsOverloadScheme | Virajith Jalaparti | Virajith Jalaparti |
| [HADOOP-16798](https://issues.apache.org/jira/browse/HADOOP-16798) | job commit failure in S3A MR magic committer test | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-10325](https://issues.apache.org/jira/browse/YARN-10325) | Document max-parallel-apps for Capacity Scheduler | Major | capacity scheduler, capacityscheduler | Peter Bacsko | Peter Bacsko |
| [HADOOP-16961](https://issues.apache.org/jira/browse/HADOOP-16961) | ABFS: Adding metrics to AbfsInputStream (AbfsInputStreamStatistics) | Major | fs/azure | Gabor Bota | Mehakmeet Singh |
| [HADOOP-17086](https://issues.apache.org/jira/browse/HADOOP-17086) | ABFS: Fix the parsing errors in ABFS Driver with creation Time (being returned in ListPath) | Major | fs/azure | Ishani | Bilahari T H |
| [HDFS-15430](https://issues.apache.org/jira/browse/HDFS-15430) | create should work when parent dir is internalDir and fallback configured. | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15450](https://issues.apache.org/jira/browse/HDFS-15450) | Fix NN trash emptier to work if ViewFSOveroadScheme enabled | Major | namenode, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17111](https://issues.apache.org/jira/browse/HADOOP-17111) | Replace Guava Optional with Java8+ Optional | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15449](https://issues.apache.org/jira/browse/HDFS-15449) | Optionally ignore port number in mount-table name when picking from initialized uri | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17058](https://issues.apache.org/jira/browse/HADOOP-17058) | Support for Appendblob in abfs driver | Major | fs/azure | Ishani | Ishani |
| [HDFS-15462](https://issues.apache.org/jira/browse/HDFS-15462) | Add fs.viewfs.overload.scheme.target.ofs.impl to core-default.xml | Major | configuration, viewfs, viewfsOverloadScheme | Siyao Meng | Siyao Meng |
| [HDFS-15464](https://issues.apache.org/jira/browse/HDFS-15464) | ViewFsOverloadScheme should work when -fs option pointing to remote cluster without mount links | Major | viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17105](https://issues.apache.org/jira/browse/HADOOP-17105) | S3AFS globStatus attempts to resolve symlinks | Minor | fs/s3 | Jimmy Zuber | Jimmy Zuber |
| [HADOOP-17022](https://issues.apache.org/jira/browse/HADOOP-17022) | Tune S3A listFiles() api. | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HADOOP-17101](https://issues.apache.org/jira/browse/HADOOP-17101) | Replace Guava Function with Java8+ Function | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17099](https://issues.apache.org/jira/browse/HADOOP-17099) | Replace Guava Predicate with Java8+ Predicate | Minor | . | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-16682](https://issues.apache.org/jira/browse/HADOOP-16682) | Remove unnecessary ABFS toString() invocations | Minor | fs/azure | Jeetesh Mangwani | Bilahari T H |
| [HADOOP-17136](https://issues.apache.org/jira/browse/HADOOP-17136) | ITestS3ADirectoryPerformance.testListOperations failing | Minor | fs/s3, test | Mukund Thakur | Mukund Thakur |
| [HDFS-15478](https://issues.apache.org/jira/browse/HDFS-15478) | When Empty mount points, we are assigning fallback link to self. But it should not use full URI for target fs. | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17100](https://issues.apache.org/jira/browse/HADOOP-17100) | Replace Guava Supplier with Java8+ Supplier in Hadoop | Major | . | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17132](https://issues.apache.org/jira/browse/HADOOP-17132) | ABFS: Fix For Idempotency code | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17092](https://issues.apache.org/jira/browse/HADOOP-17092) | ABFS: Long waits and unintended retries when multiple threads try to fetch token using ClientCreds | Major | fs/azure | Sneha Vijayarajan | Bilahari T H |
| [HADOOP-17131](https://issues.apache.org/jira/browse/HADOOP-17131) | Refactor S3A Listing code for better isolation | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HADOOP-17137](https://issues.apache.org/jira/browse/HADOOP-17137) | ABFS: Tests ITestAbfsNetworkStatistics need to be config setting agnostic | Minor | fs/azure, test | Sneha Vijayarajan | Bilahari T H |
| [HADOOP-17149](https://issues.apache.org/jira/browse/HADOOP-17149) | ABFS: Test failure: testFailedRequestWhenCredentialsNotCorrect fails when run with SharedKey | Minor | fs/azure | Sneha Vijayarajan | Bilahari T H |
| [HADOOP-17163](https://issues.apache.org/jira/browse/HADOOP-17163) | ABFS: Add debug log for rename failures | Major | fs/azure | Bilahari T H | Bilahari T H |
| [HDFS-15515](https://issues.apache.org/jira/browse/HDFS-15515) | mkdirs on fallback should throw IOE out instead of suppressing and returning false | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-13230](https://issues.apache.org/jira/browse/HADOOP-13230) | S3A to optionally retain directory markers | Major | fs/s3 | Aaron Fabbri | Steve Loughran |
| [HADOOP-14124](https://issues.apache.org/jira/browse/HADOOP-14124) | S3AFileSystem silently deletes "fake" directories when writing a file. | Minor | fs, fs/s3 | Joel Baranick | |
| [HADOOP-16966](https://issues.apache.org/jira/browse/HADOOP-16966) | ABFS: Upgrade Store REST API Version to 2019-12-12 | Major | fs/azure | Ishani | Sneha Vijayarajan |
| [HDFS-15533](https://issues.apache.org/jira/browse/HDFS-15533) | Provide DFS API compatible class(ViewDistributedFileSystem), but use ViewFileSystemOverloadScheme inside | Major | dfs, viewfs | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17074](https://issues.apache.org/jira/browse/HADOOP-17074) | Optimise s3a Listing to be fully asynchronous. | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HDFS-15529](https://issues.apache.org/jira/browse/HDFS-15529) | getChildFilesystems should include fallback fs as well | Critical | viewfs, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17167](https://issues.apache.org/jira/browse/HADOOP-17167) | ITestS3AEncryptionWithDefaultS3Settings fails if default bucket encryption != KMS | Minor | fs/s3 | Steve Loughran | Mukund Thakur |
| [HADOOP-17227](https://issues.apache.org/jira/browse/HADOOP-17227) | improve s3guard markers command line tool | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-10332](https://issues.apache.org/jira/browse/YARN-10332) | RESOURCE\_UPDATE event was repeatedly registered in DECOMMISSIONING state | Minor | resourcemanager | yehuanhuan | yehuanhuan |
| [HDFS-15558](https://issues.apache.org/jira/browse/HDFS-15558) | ViewDistributedFileSystem#recoverLease should call super.recoverLease when there are no mounts configured | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17181](https://issues.apache.org/jira/browse/HADOOP-17181) | Handle transient stream read failures in FileSystem contract tests | Minor | fs/s3 | Steve Loughran | |
| [HDFS-15551](https://issues.apache.org/jira/browse/HDFS-15551) | Tiny Improve for DeadNode detector | Minor | hdfs-client | dark\_num | imbajin |
| [HDFS-15555](https://issues.apache.org/jira/browse/HDFS-15555) | RBF: Refresh cacheNS when SocketException occurs | Major | rbf | Akira Ajisaka | Akira Ajisaka |
| [HDFS-15532](https://issues.apache.org/jira/browse/HDFS-15532) | listFiles on root/InternalDir will fail if fallback root has file | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15578](https://issues.apache.org/jira/browse/HDFS-15578) | Fix the rename issues with fallback fs enabled | Major | viewfs, viewfsOverloadScheme | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HDFS-15585](https://issues.apache.org/jira/browse/HDFS-15585) | ViewDFS#getDelegationToken should not throw UnsupportedOperationException. | Major | . | Uma Maheswara Rao G | Uma Maheswara Rao G |
| [HADOOP-17215](https://issues.apache.org/jira/browse/HADOOP-17215) | ABFS: Support for conditional overwrite | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HDFS-14811](https://issues.apache.org/jira/browse/HDFS-14811) | RBF: TestRouterRpc#testErasureCoding is flaky | Major | rbf | Chen Zhang | Chen Zhang |
| [HADOOP-17023](https://issues.apache.org/jira/browse/HADOOP-17023) | Tune listStatus() api of s3a. | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HADOOP-17279](https://issues.apache.org/jira/browse/HADOOP-17279) | ABFS: Test testNegativeScenariosForCreateOverwriteDisabled fails for non-HNS account | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17183](https://issues.apache.org/jira/browse/HADOOP-17183) | ABFS: Enable checkaccess API | Major | fs/azure | Bilahari T H | Bilahari T H |
| [HDFS-15613](https://issues.apache.org/jira/browse/HDFS-15613) | RBF: Router FSCK fails after HDFS-14442 | Major | rbf | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17281](https://issues.apache.org/jira/browse/HADOOP-17281) | Implement FileSystem.listStatusIterator() in S3AFileSystem | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HADOOP-17293](https://issues.apache.org/jira/browse/HADOOP-17293) | S3A to always probe S3 in S3A getFileStatus on non-auth paths | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-15620](https://issues.apache.org/jira/browse/HDFS-15620) | RBF: Fix test failures after HADOOP-17281 | Major | rbf, test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17261](https://issues.apache.org/jira/browse/HADOOP-17261) | s3a rename() now requires s3:deleteObjectVersion permission | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-16915](https://issues.apache.org/jira/browse/HADOOP-16915) | ABFS: Test failure ITestAzureBlobFileSystemRandomRead.testRandomReadPerformance | Major | . | Bilahari T H | Bilahari T H |
| [HADOOP-17166](https://issues.apache.org/jira/browse/HADOOP-17166) | ABFS: configure output stream thread pool | Minor | fs/azure | Bilahari T H | Bilahari T H |
| [HADOOP-17301](https://issues.apache.org/jira/browse/HADOOP-17301) | ABFS: read-ahead error reporting breaks buffer management | Critical | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17288](https://issues.apache.org/jira/browse/HADOOP-17288) | Use shaded guava from thirdparty | Major | . | Ayush Saxena | Ayush Saxena |
| [HDFS-15459](https://issues.apache.org/jira/browse/HDFS-15459) | TestBlockTokenWithDFSStriped fails intermittently | Major | hdfs | Ahmed Hussein | Ahmed Hussein |
| [HDFS-15461](https://issues.apache.org/jira/browse/HDFS-15461) | TestDFSClientRetries#testGetFileChecksum fails intermittently | Major | dfsclient, test | Ahmed Hussein | Ahmed Hussein |
| [HDFS-9776](https://issues.apache.org/jira/browse/HDFS-9776) | TestHAAppend#testMultipleAppendsDuringCatchupTailing is flaky | Major | . | Vinayakumar B | Ahmed Hussein |
| [HDFS-15657](https://issues.apache.org/jira/browse/HDFS-15657) | RBF: TestRouter#testNamenodeHeartBeatEnableDefault fails by BindException | Major | rbf, test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17305](https://issues.apache.org/jira/browse/HADOOP-17305) | ITestCustomSigner fails with gcs s3 compatible endpoint. | Major | fs/s3 | Mukund Thakur | Mukund Thakur |
| [HDFS-15643](https://issues.apache.org/jira/browse/HDFS-15643) | EC: Fix checksum computation in case of native encoders | Blocker | . | Ahmed Hussein | Ayush Saxena |
| [HADOOP-17344](https://issues.apache.org/jira/browse/HADOOP-17344) | Harmonize guava version and shade guava in yarn-csi | Major | . | Wei-Chiu Chuang | Akira Ajisaka |
| [HADOOP-17376](https://issues.apache.org/jira/browse/HADOOP-17376) | ITestS3AContractRename failing against stricter tests | Major | fs/s3, test | Steve Loughran | Attila Doroszlai |
| [HADOOP-17379](https://issues.apache.org/jira/browse/HADOOP-17379) | AbstractS3ATokenIdentifier to set issue date == now | Major | fs/s3 | Steve Loughran | Jungtaek Lim |
| [HADOOP-17244](https://issues.apache.org/jira/browse/HADOOP-17244) | HADOOP-17244. S3A directory delete tombstones dir markers prematurely. | Blocker | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17388](https://issues.apache.org/jira/browse/HADOOP-17388) | AbstractS3ATokenIdentifier to issue date in UTC | Major | . | Steve Loughran | Jungtaek Lim |
| [HADOOP-17343](https://issues.apache.org/jira/browse/HADOOP-17343) | Upgrade aws-java-sdk to 1.11.901 | Minor | build, fs/s3 | Dongjoon Hyun | Steve Loughran |
| [HADOOP-17325](https://issues.apache.org/jira/browse/HADOOP-17325) | WASB: Test failures | Major | fs/azure, test | Sneha Vijayarajan | Steve Loughran |
| [HADOOP-17323](https://issues.apache.org/jira/browse/HADOOP-17323) | s3a getFileStatus("/") to skip IO | Minor | fs/s3 | Steve Loughran | Mukund Thakur |
| [HADOOP-17311](https://issues.apache.org/jira/browse/HADOOP-17311) | ABFS: Logs should redact SAS signature | Major | fs/azure, security | Sneha Vijayarajan | Bilahari T H |
| [HADOOP-17313](https://issues.apache.org/jira/browse/HADOOP-17313) | FileSystem.get to support slow-to-instantiate FS clients | Major | fs, fs/azure, fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17394](https://issues.apache.org/jira/browse/HADOOP-17394) | [JDK 11] mvn package -Pdocs fails | Major | build, documentation | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17396](https://issues.apache.org/jira/browse/HADOOP-17396) | ABFS: testRenameFileOverExistingFile Fails after Contract test update | Major | fs/azure, test | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17318](https://issues.apache.org/jira/browse/HADOOP-17318) | S3A committer to support concurrent jobs with same app attempt ID & dest dir | Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17385](https://issues.apache.org/jira/browse/HADOOP-17385) | ITestS3ADeleteCost.testDirMarkersFileCreation failure | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-15844](https://issues.apache.org/jira/browse/HADOOP-15844) | tag S3GuardTool entry points as limitedPrivate("management-tools")/evolving | Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17332](https://issues.apache.org/jira/browse/HADOOP-17332) | S3A marker tool mixes up -min and -max | Trivial | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17397](https://issues.apache.org/jira/browse/HADOOP-17397) | ABFS: SAS Test updates for version and permission update | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HDFS-15708](https://issues.apache.org/jira/browse/HDFS-15708) | TestURLConnectionFactory fails by NoClassDefFoundError in branch-3.3 and branch-3.2 | Blocker | test | Akira Ajisaka | Chao Sun |
| [HDFS-15716](https://issues.apache.org/jira/browse/HDFS-15716) | TestUpgradeDomainBlockPlacementPolicy flaky | Major | namenode, test | Ahmed Hussein | Ahmed Hussein |
| [HADOOP-17422](https://issues.apache.org/jira/browse/HADOOP-17422) | ABFS: Set default ListMaxResults to max server limit | Major | fs/azure | Sumangala Patki | Thomas Marqardt |
| [HADOOP-17450](https://issues.apache.org/jira/browse/HADOOP-17450) | hadoop-common to add IOStatistics API | Major | fs | Steve Loughran | Steve Loughran |
| [HADOOP-17271](https://issues.apache.org/jira/browse/HADOOP-17271) | S3A statistics to support IOStatistics | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17347](https://issues.apache.org/jira/browse/HADOOP-17347) | ABFS: Optimise read for small files/tails of files | Major | fs/azure | Bilahari T H | Bilahari T H |
| [HADOOP-17272](https://issues.apache.org/jira/browse/HADOOP-17272) | ABFS Streams to support IOStatistics API | Major | fs/azure | Steve Loughran | Mehakmeet Singh |
| [HADOOP-17451](https://issues.apache.org/jira/browse/HADOOP-17451) | Intermittent failure of S3A tests which make assertions on statistics/IOStatistics | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HDFS-15762](https://issues.apache.org/jira/browse/HDFS-15762) | TestMultipleNNPortQOP#testMultipleNNPortOverwriteDownStream fails intermittently | Minor | . | Toshihiko Uchida | Toshihiko Uchida |
| [HDFS-15672](https://issues.apache.org/jira/browse/HDFS-15672) | TestBalancerWithMultipleNameNodes#testBalancingBlockpoolsWithBlockPoolPolicy fails on trunk | Major | . | Ahmed Hussein | Masatake Iwasaki |
| [HADOOP-13845](https://issues.apache.org/jira/browse/HADOOP-13845) | s3a to instrument duration of HTTP calls | Minor | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17456](https://issues.apache.org/jira/browse/HADOOP-17456) | S3A ITestPartialRenamesDeletes.testPartialDirDelete[bulk-delete=true] failure | Minor | fs/s3, test | Steve Loughran | Steve Loughran |
| [HADOOP-17455](https://issues.apache.org/jira/browse/HADOOP-17455) | [s3a] Intermittent failure of ITestS3ADeleteCost.testDeleteSingleFileInDir | Major | fs/s3, test | Gabor Bota | Steve Loughran |
| [HADOOP-17433](https://issues.apache.org/jira/browse/HADOOP-17433) | Skipping network I/O in S3A getFileStatus(/) breaks ITestAssumeRole | Minor | fs/s3, test | Steve Loughran | Steve Loughran |
| [HADOOP-17296](https://issues.apache.org/jira/browse/HADOOP-17296) | ABFS: Allow Random Reads to be of Buffer Size | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17413](https://issues.apache.org/jira/browse/HADOOP-17413) | ABFS: Release Elastic ByteBuffer pool memory at outputStream close | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17407](https://issues.apache.org/jira/browse/HADOOP-17407) | ABFS: Delete Idempotency handling can lead to NPE | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17404](https://issues.apache.org/jira/browse/HADOOP-17404) | ABFS: Piggyback flush on Append calls for short writes | Major | fs/azure | Sneha Vijayarajan | Sneha Vijayarajan |
| [HADOOP-17480](https://issues.apache.org/jira/browse/HADOOP-17480) | S3A docs to state s3 is consistent, deprecate S3Guard | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17414](https://issues.apache.org/jira/browse/HADOOP-17414) | Magic committer files don't have the count of bytes written collected by spark | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17493](https://issues.apache.org/jira/browse/HADOOP-17493) | renaming S3A Statistic DELEGATION\_TOKENS\_ISSUED to DELEGATION\_TOKEN\_ISSUED broke tests downstream | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17483](https://issues.apache.org/jira/browse/HADOOP-17483) | magic committer to be enabled for all S3 buckets | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17337](https://issues.apache.org/jira/browse/HADOOP-17337) | S3A NetworkBinding has a runtime class dependency on a third-party shaded class | Blocker | fs/s3 | Chris Wensel | Steve Loughran |
| [HADOOP-17475](https://issues.apache.org/jira/browse/HADOOP-17475) | ABFS : add high performance listStatusIterator | Major | fs/azure | Bilahari T H | Bilahari T H |
| [HADOOP-17432](https://issues.apache.org/jira/browse/HADOOP-17432) | [JDK 16] KerberosUtil#getOidInstance is broken by JEP 396 | Major | auth | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-13327](https://issues.apache.org/jira/browse/HADOOP-13327) | Add OutputStream + Syncable to the Filesystem Specification | Major | fs | Steve Loughran | Steve Loughran |
| [HDFS-15836](https://issues.apache.org/jira/browse/HDFS-15836) | RBF: Fix contract tests after HADOOP-13327 | Major | rbf | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17038](https://issues.apache.org/jira/browse/HADOOP-17038) | Support disabling buffered reads in ABFS positional reads | Major | . | Anoop Sam John | Anoop Sam John |
| [HADOOP-15710](https://issues.apache.org/jira/browse/HADOOP-15710) | ABFS checkException to map 403 to AccessDeniedException | Blocker | fs/azure | Steve Loughran | Steve Loughran |
| [HDFS-15847](https://issues.apache.org/jira/browse/HDFS-15847) | create client protocol: add ecPolicyName & storagePolicy param to debug statement string | Minor | . | Bhavik Patel | Bhavik Patel |
| [HADOOP-16748](https://issues.apache.org/jira/browse/HADOOP-16748) | Migrate to Python 3 and upgrade Yetus to 0.13.0 | Major | . | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-16906](https://issues.apache.org/jira/browse/HADOOP-16906) | Add some Abortable.abort() interface for streams etc which can be terminated | Blocker | fs, fs/azure, fs/s3 | Steve Loughran | Jungtaek Lim |
| [HADOOP-17567](https://issues.apache.org/jira/browse/HADOOP-17567) | typo in MagicCommitTracker | Trivial | fs/s3 | Pierrick HYMBERT | Pierrick HYMBERT |
| [HADOOP-17191](https://issues.apache.org/jira/browse/HADOOP-17191) | ABFS: Run the integration tests with various combinations of configurations and publish consolidated results | Minor | fs/azure, test | Bilahari T H | Bilahari T H |
| [HADOOP-16721](https://issues.apache.org/jira/browse/HADOOP-16721) | Improve S3A rename resilience | Blocker | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17548](https://issues.apache.org/jira/browse/HADOOP-17548) | ABFS: Toggle Store Mkdirs request overwrite parameter | Major | fs/azure | Sumangala Patki | Sumangala Patki |
| [HADOOP-17537](https://issues.apache.org/jira/browse/HADOOP-17537) | Correct abfs test assertion reversed in HADOOP-13327 | Major | fs/azure, test | Sumangala Patki | Sumangala Patki |
| [HDFS-15890](https://issues.apache.org/jira/browse/HDFS-15890) | Improve the Logs for File Concat Operation | Minor | namenode | Bhavik Patel | Bhavik Patel |
| [HDFS-13975](https://issues.apache.org/jira/browse/HDFS-13975) | TestBalancer#testMaxIterationTime fails sporadically | Major | . | Jason Darrell Lowe | Toshihiko Uchida |
| [YARN-10688](https://issues.apache.org/jira/browse/YARN-10688) | ClusterMetrics should support GPU capacity related metrics. | Major | metrics, resourcemanager | Qi Zhu | Qi Zhu |
| [YARN-10692](https://issues.apache.org/jira/browse/YARN-10692) | Add Node GPU Utilization and apply to NodeMetrics. | Major | . | Qi Zhu | Qi Zhu |
| [HDFS-15902](https://issues.apache.org/jira/browse/HDFS-15902) | Improve the log for HTTPFS server operation | Minor | httpfs | Bhavik Patel | Bhavik Patel |
| [HADOOP-17476](https://issues.apache.org/jira/browse/HADOOP-17476) | ITestAssumeRole.testAssumeRoleBadInnerAuth failure | Major | fs/s3, test | Steve Loughran | Steve Loughran |
| [HADOOP-13551](https://issues.apache.org/jira/browse/HADOOP-13551) | Collect AwsSdkMetrics in S3A FileSystem IOStatistics | Blocker | fs/s3 | Steve Loughran | Steve Loughran |
| [YARN-10713](https://issues.apache.org/jira/browse/YARN-10713) | ClusterMetrics should support custom resource capacity related metrics. | Major | . | Qi Zhu | Qi Zhu |
| [HDFS-15921](https://issues.apache.org/jira/browse/HDFS-15921) | Improve the log for the Storage Policy Operations | Minor | namenode | Bhavik Patel | Bhavik Patel |
| [YARN-10702](https://issues.apache.org/jira/browse/YARN-10702) | Add cluster metric for amount of CPU used by RM Event Processor | Minor | yarn | Jim Brennan | Jim Brennan |
| [YARN-10503](https://issues.apache.org/jira/browse/YARN-10503) | Support queue capacity in terms of absolute resources with custom resourceType. | Critical | . | Qi Zhu | Qi Zhu |
| [HADOOP-17630](https://issues.apache.org/jira/browse/HADOOP-17630) | [JDK 15] TestPrintableString fails due to Unicode 13.0 support | Major | . | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17576](https://issues.apache.org/jira/browse/HADOOP-17576) | ABFS: Disable throttling update for auth failures | Major | fs/azure | Sumangala Patki | Sumangala Patki |
| [YARN-10723](https://issues.apache.org/jira/browse/YARN-10723) | Change CS nodes page in UI to support custom resource. | Major | . | Qi Zhu | Qi Zhu |
| [HADOOP-16948](https://issues.apache.org/jira/browse/HADOOP-16948) | ABFS: Support infinite lease dirs | Minor | . | Billie Rinaldi | Billie Rinaldi |
| [HADOOP-17471](https://issues.apache.org/jira/browse/HADOOP-17471) | ABFS to collect IOStatistics | Major | fs/azure | Steve Loughran | Mehakmeet Singh |
| [HADOOP-17535](https://issues.apache.org/jira/browse/HADOOP-17535) | ABFS: ITestAzureBlobFileSystemCheckAccess test failure if test doesn't have oauth keys | Major | fs/azure | Steve Loughran | Steve Loughran |
| [HADOOP-17112](https://issues.apache.org/jira/browse/HADOOP-17112) | whitespace not allowed in paths when saving files to s3a via committer | Blocker | fs/s3 | Krzysztof Adamski | Krzysztof Adamski |
| [HADOOP-17597](https://issues.apache.org/jira/browse/HADOOP-17597) | Add option to downgrade S3A rejection of Syncable to warning | Minor | . | Steve Loughran | Steve Loughran |
| [HADOOP-17661](https://issues.apache.org/jira/browse/HADOOP-17661) | mvn versions:set fails to parse pom.xml | Blocker | build | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-17536](https://issues.apache.org/jira/browse/HADOOP-17536) | ABFS: Suport for customer provided encryption key | Minor | fs/azure | Bilahari T H | Bilahari T H |
| [YARN-10707](https://issues.apache.org/jira/browse/YARN-10707) | Support custom resources in ResourceUtilization, and update Node GPU Utilization to use. | Major | yarn | Qi Zhu | Qi Zhu |
| [HADOOP-17653](https://issues.apache.org/jira/browse/HADOOP-17653) | Do not use guava's Files.createTempDir() | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-15952](https://issues.apache.org/jira/browse/HDFS-15952) | TestRouterRpcMultiDestination#testProxyGetTransactionID and testProxyVersionRequest are flaky | Major | rbf | Harunobu Daikoku | Akira Ajisaka |
| [HADOOP-16742](https://issues.apache.org/jira/browse/HADOOP-16742) | Possible NPE in S3A MultiObjectDeleteSupport error handling | Major | fs/s3 | Steve Loughran | Steve Loughran |
| [HADOOP-17644](https://issues.apache.org/jira/browse/HADOOP-17644) | Add back the exceptions removed by HADOOP-17432 for compatibility | Blocker | bulid | Akira Ajisaka | Quan Li |
| [YARN-10642](https://issues.apache.org/jira/browse/YARN-10642) | Race condition: AsyncDispatcher can get stuck by the changes introduced in YARN-8995 | Critical | resourcemanager | zhengchenyu | zhengchenyu |
| [YARN-9615](https://issues.apache.org/jira/browse/YARN-9615) | Add dispatcher metrics to RM | Major | . | Jonathan Hung | Qi Zhu |
| [HDFS-13934](https://issues.apache.org/jira/browse/HDFS-13934) | Multipart uploaders to be created through API call to FileSystem/FileContext, not service loader | Major | fs, fs/s3, hdfs | Steve Loughran | Steve Loughran |
| [HADOOP-17665](https://issues.apache.org/jira/browse/HADOOP-17665) | Ignore missing keystore configuration in reloading mechanism | Major | . | Borislav Iordanov | Borislav Iordanov |
| [HADOOP-17663](https://issues.apache.org/jira/browse/HADOOP-17663) | Remove useless property hadoop.assemblies.version in pom file | Trivial | build | Wei-Chiu Chuang | Akira Ajisaka |
| [HADOOP-17666](https://issues.apache.org/jira/browse/HADOOP-17666) | Update LICENSE for 3.3.1 | Blocker | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
### OTHER:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-17430](https://issues.apache.org/jira/browse/HADOOP-17430) | Restore ability to set Text to empty byte array | Minor | common | gaozhan ding | gaozhan ding |
| [HDFS-15870](https://issues.apache.org/jira/browse/HDFS-15870) | Remove unused configuration dfs.namenode.stripe.min | Minor | . | tomscut | tomscut |
| [HDFS-15808](https://issues.apache.org/jira/browse/HDFS-15808) | Add metrics for FSNamesystem read/write lock hold long time | Major | hdfs | tomscut | tomscut |
| [HDFS-15873](https://issues.apache.org/jira/browse/HDFS-15873) | Add namenode address in logs for block report | Minor | datanode, hdfs | tomscut | tomscut |
| [HDFS-15906](https://issues.apache.org/jira/browse/HDFS-15906) | Close FSImage and FSNamesystem after formatting is complete | Minor | . | tomscut | tomscut |
| [HDFS-15892](https://issues.apache.org/jira/browse/HDFS-15892) | Add metric for editPendingQ in FSEditLogAsync | Minor | . | tomscut | tomscut |
| [HDFS-15951](https://issues.apache.org/jira/browse/HDFS-15951) | Remove unused parameters in NameNodeProxiesClient | Minor | . | tomscut | tomscut |
| [HDFS-15975](https://issues.apache.org/jira/browse/HDFS-15975) | Use LongAdder instead of AtomicLong | Minor | . | tomscut | tomscut |
| [HDFS-15970](https://issues.apache.org/jira/browse/HDFS-15970) | Print network topology on the web | Minor | . | tomscut | tomscut |
| [HDFS-15991](https://issues.apache.org/jira/browse/HDFS-15991) | Add location into datanode info for NameNodeMXBean | Minor | . | tomscut | tomscut |
| [HADOOP-17055](https://issues.apache.org/jira/browse/HADOOP-17055) | Remove residual code of Ozone | Major | . | Wanqiang Ji | Wanqiang Ji |
| [YARN-10274](https://issues.apache.org/jira/browse/YARN-10274) | Merge QueueMapping and QueueMappingEntity | Major | yarn | Gergely Pollák | Gergely Pollák |
| [YARN-10281](https://issues.apache.org/jira/browse/YARN-10281) | Redundant QueuePath usage in UserGroupMappingPlacementRule and AppNameMappingPlacementRule | Major | . | Gergely Pollák | Gergely Pollák |
| [YARN-10279](https://issues.apache.org/jira/browse/YARN-10279) | Avoid unnecessary QueueMappingEntity creations | Minor | . | Gergely Pollák | Hudáky Márton Gyula |
| [YARN-10277](https://issues.apache.org/jira/browse/YARN-10277) | CapacityScheduler test TestUserGroupMappingPlacementRule should build proper hierarchy | Major | . | Gergely Pollák | Szilard Nemeth |
| [HADOOP-16990](https://issues.apache.org/jira/browse/HADOOP-16990) | Update Mockserver | Major | . | Wei-Chiu Chuang | Attila Doroszlai |
| [YARN-10278](https://issues.apache.org/jira/browse/YARN-10278) | CapacityScheduler test framework ProportionalCapacityPreemptionPolicyMockFramework need some review | Major | . | Gergely Pollák | Szilard Nemeth |
| [YARN-10540](https://issues.apache.org/jira/browse/YARN-10540) | Node page is broken in YARN UI1 and UI2 including RMWebService api for nodes | Critical | webapp | Sunil G | Jim Brennan |
| [HADOOP-17445](https://issues.apache.org/jira/browse/HADOOP-17445) | Update the year to 2021 | Major | . | Xiaoqiao He | Xiaoqiao He |
| [HDFS-15731](https://issues.apache.org/jira/browse/HDFS-15731) | Reduce threadCount for unit tests to reduce the memory usage | Major | build, test | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-17571](https://issues.apache.org/jira/browse/HADOOP-17571) | Upgrade com.fasterxml.woodstox:woodstox-core for security reasons | Major | . | Viraj Jasani | Viraj Jasani |
| [HDFS-15895](https://issues.apache.org/jira/browse/HDFS-15895) | DFSAdmin#printOpenFiles has redundant String#format usage | Minor | . | Viraj Jasani | Viraj Jasani |
| [HDFS-15926](https://issues.apache.org/jira/browse/HDFS-15926) | Removed duplicate dependency of hadoop-annotations | Minor | . | Viraj Jasani | Viraj Jasani |
| [HADOOP-17614](https://issues.apache.org/jira/browse/HADOOP-17614) | Bump netty to the latest 4.1.61 | Blocker | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-17622](https://issues.apache.org/jira/browse/HADOOP-17622) | Avoid usage of deprecated IOUtils#cleanup API | Minor | . | Viraj Jasani | Viraj Jasani |
| [HADOOP-17624](https://issues.apache.org/jira/browse/HADOOP-17624) | Remove any rocksdb exclusion code | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HADOOP-17625](https://issues.apache.org/jira/browse/HADOOP-17625) | Update to Jetty 9.4.39 | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-15989](https://issues.apache.org/jira/browse/HDFS-15989) | Split TestBalancer into two classes | Major | . | Viraj Jasani | Viraj Jasani |
| [HADOOP-17676](https://issues.apache.org/jira/browse/HADOOP-17676) | Restrict imports from org.apache.curator.shaded | Major | . | Viraj Jasani | Viraj Jasani |
| [HADOOP-17683](https://issues.apache.org/jira/browse/HADOOP-17683) | Update commons-io to 2.8.0 | Major | . | Wei-Chiu Chuang | Akira Ajisaka |
| [HADOOP-17426](https://issues.apache.org/jira/browse/HADOOP-17426) | Upgrade to hadoop-thirdparty-1.1.0 | Major | . | Ayush Saxena | Wei-Chiu Chuang |
| [HADOOP-17739](https://issues.apache.org/jira/browse/HADOOP-17739) | Use hadoop-thirdparty 1.1.1 | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang |

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# Apache Hadoop 3.3.1 Release Notes
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
---
* [HADOOP-16054](https://issues.apache.org/jira/browse/HADOOP-16054) | *Major* | **Update Dockerfile to use Bionic**
The build image has been upgraded to Bionic.
---
* [HDFS-15281](https://issues.apache.org/jira/browse/HDFS-15281) | *Major* | **ZKFC ignores dfs.namenode.rpc-bind-host and uses dfs.namenode.rpc-address to bind to host address**
ZKFC binds host address to "dfs.namenode.servicerpc-bind-host", if configured. Otherwise, it binds to "dfs.namenode.rpc-bind-host". If neither of those is configured, ZKFC binds itself to NameNode RPC server address (effectively "dfs.namenode.rpc-address").
---
* [HADOOP-16916](https://issues.apache.org/jira/browse/HADOOP-16916) | *Minor* | **ABFS: Delegation SAS generator for integration with Ranger**
Azure ABFS support for Shared Access Signatures (SAS)
---
* [HADOOP-17044](https://issues.apache.org/jira/browse/HADOOP-17044) | *Major* | **Revert "HADOOP-8143. Change distcp to have -pb on by default"**
Distcp block size is not preserved by default, unless -pb is specified. This restores the behavior prior to Hadoop 3.
---
* [HADOOP-17024](https://issues.apache.org/jira/browse/HADOOP-17024) | *Major* | **ListStatus on ViewFS root (ls "/") should list the linkFallBack root (configured target root).**
ViewFS#listStatus on root("/") considers listing from fallbackLink if available. If the same directory name is present in configured mount path as well as in fallback link, then only the configured mount path will be listed in the returned result.
---
* [HDFS-13183](https://issues.apache.org/jira/browse/HDFS-13183) | *Major* | **Standby NameNode process getBlocks request to reduce Active load**
Enable balancer to redirect getBlocks request to a Standby Namenode, thus reducing the performance impact of balancer to the Active NameNode.
The feature is disabled by default. To enable it, configure the hdfs-site.xml of balancer:
dfs.ha.allow.stale.reads = true.
---
* [HADOOP-17076](https://issues.apache.org/jira/browse/HADOOP-17076) | *Minor* | **ABFS: Delegation SAS Generator Updates**
Azure Blob File System (ABFS) SAS Generator Update
---
* [HADOOP-17089](https://issues.apache.org/jira/browse/HADOOP-17089) | *Critical* | **WASB: Update azure-storage-java SDK**
Azure WASB bug fix that can cause list results to appear empty.
---
* [HADOOP-17105](https://issues.apache.org/jira/browse/HADOOP-17105) | *Minor* | **S3AFS globStatus attempts to resolve symlinks**
Remove unnecessary symlink resolution in S3AFileSystem globStatus
---
* [HADOOP-13230](https://issues.apache.org/jira/browse/HADOOP-13230) | *Major* | **S3A to optionally retain directory markers**
The S3A connector now has an option to stop deleting directory markers as files are written. This eliminates the IO throttling the operations can cause, and avoids creating tombstone markers on versioned S3 buckets.
This feature is incompatible with all versions of Hadoop which lack the HADOOP-17199 change to list and getFileStatus calls.
Consult the S3A documentation for further details
---
* [HADOOP-17215](https://issues.apache.org/jira/browse/HADOOP-17215) | *Major* | **ABFS: Support for conditional overwrite**
ABFS: Support for conditional overwrite.
---
* [YARN-9809](https://issues.apache.org/jira/browse/YARN-9809) | *Major* | **NMs should supply a health status when registering with RM**
Improved node registration with node health status.
---
* [HADOOP-17125](https://issues.apache.org/jira/browse/HADOOP-17125) | *Major* | **Using snappy-java in SnappyCodec**
The SnappyCodec uses the snappy-java compression library, rather than explicitly referencing native binaries. It contains the native libraries for many operating systems and instruction sets, falling back to a pure java implementation. It does requires the snappy-java.jar is on the classpath. It can be found in hadoop-common/lib, and has already been present as part of the avro dependencies
---
* [HDFS-15253](https://issues.apache.org/jira/browse/HDFS-15253) | *Major* | **Set default throttle value on dfs.image.transfer.bandwidthPerSec**
The configuration dfs.image.transfer.bandwidthPerSec which defines the maximum bandwidth available for fsimage transfer is changed from 0 (meaning no throttle at all) to 50MB/s.
---
* [HADOOP-17021](https://issues.apache.org/jira/browse/HADOOP-17021) | *Minor* | **Add concat fs command**
"hadoop fs" has a concat command. Available on all filesystems which support the concat API including HDFS and WebHDFS
---
* [HADOOP-17292](https://issues.apache.org/jira/browse/HADOOP-17292) | *Major* | **Using lz4-java in Lz4Codec**
The Hadoop's LZ4 compression codec now depends on lz4-java. The native LZ4 is performed by the encapsulated JNI and it is no longer necessary to install and configure the lz4 system package.
The lz4-java is declared in provided scope. Applications that wish to use lz4 codec must declare dependency on lz4-java explicitly.
---
* [HADOOP-17313](https://issues.apache.org/jira/browse/HADOOP-17313) | *Major* | **FileSystem.get to support slow-to-instantiate FS clients**
The option "fs.creation.parallel.count" sets a a semaphore to throttle the number of FileSystem instances which
can be created simultaneously.
This is designed to reduce the impact of many threads in an application calling
FileSystem.get() on a filesystem which takes time to instantiate -for example
to an object where HTTPS connections are set up during initialization.
Many threads trying to do this may create spurious delays by conflicting
for access to synchronized blocks, when simply limiting the parallelism
diminishes the conflict, so speeds up all threads trying to access
the store.
The default value, 64, is larger than is likely to deliver any speedup -but
it does mean that there should be no adverse effects from the change.
If a service appears to be blocking on all threads initializing connections to
abfs, s3a or store, try a smaller (possibly significantly smaller) value.
---
* [HADOOP-17338](https://issues.apache.org/jira/browse/HADOOP-17338) | *Major* | **Intermittent S3AInputStream failures: Premature end of Content-Length delimited message body etc**
**WARNING: No release note provided for this change.**
---
* [HDFS-15380](https://issues.apache.org/jira/browse/HDFS-15380) | *Major* | **RBF: Could not fetch real remote IP in RouterWebHdfsMethods**
**WARNING: No release note provided for this change.**
---
* [HADOOP-17422](https://issues.apache.org/jira/browse/HADOOP-17422) | *Major* | **ABFS: Set default ListMaxResults to max server limit**
ABFS: The default value for "fs.azure.list.max.results" was changed from 500 to 5000.
---
* [HDFS-15719](https://issues.apache.org/jira/browse/HDFS-15719) | *Critical* | **[Hadoop 3] Both NameNodes can crash simultaneously due to the short JN socket timeout**
The default value of the configuration hadoop.http.idle\_timeout.ms (how long does Jetty disconnect an idle connection) is changed from 10000 to 60000.
This property is inlined during compile time, so an application that references this property must be recompiled in order for it to take effect.
---
* [HADOOP-17454](https://issues.apache.org/jira/browse/HADOOP-17454) | *Major* | **[s3a] Disable bucket existence check - set fs.s3a.bucket.probe to 0**
S3A bucket existence check is disabled (fs.s3a.bucket.probe is 0), so there will be no existence check on the bucket during the S3AFileSystem initialization. The first operation which attempts to interact with the bucket which will fail if the bucket does not exist.
---
* [HADOOP-17337](https://issues.apache.org/jira/browse/HADOOP-17337) | *Blocker* | **S3A NetworkBinding has a runtime class dependency on a third-party shaded class**
the s3a filesystem will link against the unshaded AWS s3 SDK. Making an application's dependencies consistent with that SDK is left as exercise. Note: native openssl is not supported as a socket factory in unshaded deployments.
---
* [HADOOP-16748](https://issues.apache.org/jira/browse/HADOOP-16748) | *Major* | **Migrate to Python 3 and upgrade Yetus to 0.13.0**
<!-- markdown -->
- Upgraded Yetus to 0.13.0.
- Removed determine-flaky-tests-hadoop.py.
- Temporarily disabled shelldocs check in the Jenkins jobs due to YETUS-1099.
---
* [HADOOP-16721](https://issues.apache.org/jira/browse/HADOOP-16721) | *Blocker* | **Improve S3A rename resilience**
The S3A connector's rename() operation now raises FileNotFoundException if the source doesn't exist; FileAlreadyExistsException if the destination is unsuitable. It no longer checks for a parent directory existing -instead it simply verifies that there is no file immediately above the destination path.
---
* [HADOOP-17531](https://issues.apache.org/jira/browse/HADOOP-17531) | *Critical* | **DistCp: Reduce memory usage on copying huge directories**
Added a -useiterator option in distcp which uses listStatusIterator for building the listing. Primarily to reduce memory usage at client for building listing.
---
* [HADOOP-16870](https://issues.apache.org/jira/browse/HADOOP-16870) | *Major* | **Use spotbugs-maven-plugin instead of findbugs-maven-plugin**
Removed findbugs from the hadoop build images and added spotbugs instead.
Upgraded SpotBugs to 4.2.2 and spotbugs-maven-plugin to 4.2.0.
---
* [HADOOP-17222](https://issues.apache.org/jira/browse/HADOOP-17222) | *Major* | ** Create socket address leveraging URI cache**
DFS client can use the newly added URI cache when creating socket address for read operations. By default it is disabled. When enabled, creating socket address will use cached URI object based on host:port to reduce the frequency of URI object creation.
To enable it, set the following config key to true:
\<property\>
\<name\>dfs.client.read.uri.cache.enabled\</name\>
\<value\>true\</value\>
\</property\>
---
* [HADOOP-16524](https://issues.apache.org/jira/browse/HADOOP-16524) | *Major* | **Automatic keystore reloading for HttpServer2**
Adds auto-reload of keystore.
Adds below new config (default 10 seconds):
ssl.{0}.stores.reload.interval
The refresh interval used to check if either of the truststore or keystore certificate file has changed.
---
* [HDFS-15942](https://issues.apache.org/jira/browse/HDFS-15942) | *Major* | **Increase Quota initialization threads**
The default quota initialization thread count during the NameNode startup process (dfs.namenode.quota.init-threads) is increased from 4 to 12.
---
* [HDFS-15975](https://issues.apache.org/jira/browse/HDFS-15975) | *Minor* | **Use LongAdder instead of AtomicLong**
This JIRA changes public fields in DFSHedgedReadMetrics. If you are using the public member variables of DFSHedgedReadMetrics, you need to use them through the public API.
---
* [HADOOP-17597](https://issues.apache.org/jira/browse/HADOOP-17597) | *Minor* | **Add option to downgrade S3A rejection of Syncable to warning**
The S3A output streams now raise UnsupportedOperationException on calls to Syncable.hsync() or Syncable.hflush(). This is to make absolutely clear to programs trying to use the syncable API that the stream doesn't save any data at all until close. Programs which use this to flush their write ahead logs will fail immediately, rather than appear to succeed but without saving any data.
To downgrade the API calls to simply printing a warning, set fs.s3a.downgrade.syncable.exceptions" to true. This will not change the other behaviour: no data is saved.
Object stores are not filesystems.

835
hadoop-hdfs-project/hadoop-hdfs/dev-support/jdiff/Apache_Hadoop_HDFS_3.3.1.xml Normal file
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2
hadoop-project-dist/pom.xml
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@ -134,7 +134,7 @@
<activeByDefault>false</activeByDefault>
</activation>
<properties>
<jdiff.stable.api>3.2.2</jdiff.stable.api>
<jdiff.stable.api>3.3.1</jdiff.stable.api>
<jdiff.stability>-unstable</jdiff.stability>
<!-- Commented out for HADOOP-11776 -->
<!-- Uncomment param name="${jdiff.compatibility}" in javadoc doclet if compatibility is not empty -->