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Update CHANGES.md and RELEASENOTES for 2.8.2 release.

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Junping Du 2017-10-26 19:13:58 -07:00
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# See the License for the specific language governing permissions and
# limitations under the License.
-->
# Apache Hadoop Changelog
# "Apache Hadoop" Changelog
## Release 2.8.2 - Unreleased (as of 2017-08-28)
## Release 2.8.2 - 2017-10-24
### INCOMPATIBLE CHANGES:
@ -27,6 +27,18 @@
| [HADOOP-14174](https://issues.apache.org/jira/browse/HADOOP-14174) | Set default ADLS access token provider type to ClientCredential | Major | fs/adl | John Zhuge | John Zhuge |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### NEW FEATURES:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
|:---- |:---- | :--- |:---- |:---- |:---- |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component | Reporter | Contributor |
@ -67,15 +79,17 @@
| [HDFS-11881](https://issues.apache.org/jira/browse/HDFS-11881) | NameNode consumes a lot of memory for snapshot diff report generation | Major | hdfs, snapshots | Manoj Govindassamy | Manoj Govindassamy |
| [HDFS-12042](https://issues.apache.org/jira/browse/HDFS-12042) | Lazy initialize AbstractINodeDiffList#diffs for snapshots to reduce memory consumption | Major | . | Misha Dmitriev | Misha Dmitriev |
| [HDFS-12078](https://issues.apache.org/jira/browse/HDFS-12078) | Add time unit to the description of property dfs.namenode.stale.datanode.interval in hdfs-default.xml | Minor | documentation, hdfs | Weiwei Yang | Weiwei Yang |
| [YARN-6764](https://issues.apache.org/jira/browse/YARN-6764) | Simplify the logic in FairScheduler#attemptScheduling | Trivial | fairscheduler | Yufei Gu | Yufei Gu |
| [HADOOP-14629](https://issues.apache.org/jira/browse/HADOOP-14629) | Improve exception checking in FileContext related JUnit tests | Major | fs, test | Andras Bokor | Andras Bokor |
| [HDFS-12137](https://issues.apache.org/jira/browse/HDFS-12137) | DN dataset lock should be fair | Critical | datanode | Daryn Sharp | Daryn Sharp |
| [HADOOP-14521](https://issues.apache.org/jira/browse/HADOOP-14521) | KMS client needs retry logic | Major | . | Rushabh S Shah | Rushabh S Shah |
| [HADOOP-14659](https://issues.apache.org/jira/browse/HADOOP-14659) | UGI getShortUserName does not need to search the Subject | Major | common | Daryn Sharp | Daryn Sharp |
| [YARN-6768](https://issues.apache.org/jira/browse/YARN-6768) | Improve performance of yarn api record toString and fromString | Major | . | Jonathan Eagles | Jonathan Eagles |
| [YARN-5892](https://issues.apache.org/jira/browse/YARN-5892) | Support user-specific minimum user limit percentage in Capacity Scheduler | Major | capacityscheduler | Eric Payne | Eric Payne |
| [YARN-6917](https://issues.apache.org/jira/browse/YARN-6917) | Queue path is recomputed from scratch on every allocation | Minor | capacityscheduler | Jason Lowe | Eric Payne |
| [HDFS-12301](https://issues.apache.org/jira/browse/HDFS-12301) | NN File Browser UI: Navigate to a path when enter is pressed | Trivial | ui | Ravi Prakash | Ravi Prakash |
| [HADOOP-14251](https://issues.apache.org/jira/browse/HADOOP-14251) | Credential provider should handle property key deprecation | Critical | security | John Zhuge | John Zhuge |
| [MAPREDUCE-6937](https://issues.apache.org/jira/browse/MAPREDUCE-6937) | Backport MAPREDUCE-6870 to branch-2 while preserving compatibility | Major | . | Zhe Zhang | Peter Bacsko |
| [YARN-5547](https://issues.apache.org/jira/browse/YARN-5547) | NMLeveldbStateStore should be more tolerant of unknown keys | Major | nodemanager | Jason Lowe | Ajith S |
| [YARN-6930](https://issues.apache.org/jira/browse/YARN-6930) | Admins should be able to explicitly enable specific LinuxContainerRuntime in the NodeManager | Major | nodemanager | Vinod Kumar Vavilapalli | Shane Kumpf |
### BUG FIXES:
@ -109,7 +123,7 @@
| [YARN-6137](https://issues.apache.org/jira/browse/YARN-6137) | Yarn client implicitly invoke ATS client which accesses HDFS | Major | . | Yesha Vora | Li Lu |
| [HADOOP-13433](https://issues.apache.org/jira/browse/HADOOP-13433) | Race in UGI.reloginFromKeytab | Major | security | Duo Zhang | Duo Zhang |
| [HADOOP-13119](https://issues.apache.org/jira/browse/HADOOP-13119) | Add ability to secure log servlet using proxy users | Major | . | Jeffrey E Rodriguez | Yuanbo Liu |
| [HADOOP-14058](https://issues.apache.org/jira/browse/HADOOP-14058) | Fix NativeS3FileSystemContractBaseTest#testDirWithDifferentMarkersWorks | Major | fs/s3, test | Akira Ajisaka | Yiqun Lin |
| [HADOOP-14058](https://issues.apache.org/jira/browse/HADOOP-14058) | Fix NativeS3FileSystemContractBaseTest#testDirWithDifferentMarkersWorks | Minor | fs/s3, test | Akira Ajisaka | Yiqun Lin |
| [HDFS-11084](https://issues.apache.org/jira/browse/HDFS-11084) | Add a regression test for sticky bit support of OIV ReverseXML processor | Major | tools | Wei-Chiu Chuang | Wei-Chiu Chuang |
| [HDFS-11391](https://issues.apache.org/jira/browse/HDFS-11391) | Numeric usernames do no work with WebHDFS FS (write access) | Major | webhdfs | Pierre Villard | Pierre Villard |
| [HDFS-11177](https://issues.apache.org/jira/browse/HDFS-11177) | 'storagepolicies -getStoragePolicy' command should accept URI based path. | Major | shell | Surendra Singh Lilhore | Surendra Singh Lilhore |
@ -126,7 +140,7 @@
| [YARN-6321](https://issues.apache.org/jira/browse/YARN-6321) | TestResources test timeouts are too aggressive | Major | test | Jason Lowe | Eric Badger |
| [HDFS-11512](https://issues.apache.org/jira/browse/HDFS-11512) | Increase timeout on TestShortCircuitLocalRead#testSkipWithVerifyChecksum | Minor | . | Eric Badger | Eric Badger |
| [HDFS-11499](https://issues.apache.org/jira/browse/HDFS-11499) | Decommissioning stuck because of failing recovery | Major | hdfs, namenode | Lukas Majercak | Lukas Majercak |
| [HDFS-11395](https://issues.apache.org/jira/browse/HDFS-11395) | RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode | Major | ha | Nandakumar | Nandakumar |
| [HDFS-11395](https://issues.apache.org/jira/browse/HDFS-11395) | RequestHedgingProxyProvider#RequestHedgingInvocationHandler hides the Exception thrown from NameNode | Major | ha | Nanda kumar | Nanda kumar |
| [YARN-4051](https://issues.apache.org/jira/browse/YARN-4051) | ContainerKillEvent lost when container is still recovering and application finishes | Critical | nodemanager | sandflee | sandflee |
| [YARN-6217](https://issues.apache.org/jira/browse/YARN-6217) | TestLocalCacheDirectoryManager test timeout is too aggressive | Major | test | Jason Lowe | Miklos Szegedi |
| [HDFS-11132](https://issues.apache.org/jira/browse/HDFS-11132) | Allow AccessControlException in contract tests when getFileStatus on subdirectory of existing files | Major | fs/adl, test | Vishwajeet Dusane | Vishwajeet Dusane |
@ -146,11 +160,10 @@
| [HADOOP-14247](https://issues.apache.org/jira/browse/HADOOP-14247) | FileContextMainOperationsBaseTest should clean up test root path | Minor | fs, test | Mingliang Liu | Mingliang Liu |
| [YARN-6352](https://issues.apache.org/jira/browse/YARN-6352) | Header injections are possible in application proxy servlet | Major | resourcemanager, security | Naganarasimha G R | Naganarasimha G R |
| [MAPREDUCE-6873](https://issues.apache.org/jira/browse/MAPREDUCE-6873) | MR Job Submission Fails if MR framework application path not on defaultFS | Minor | mrv2 | Erik Krogen | Erik Krogen |
| [HADOOP-14256](https://issues.apache.org/jira/browse/HADOOP-14256) | [S3A DOC] Correct the format for "Seoul" example | Minor | documentation, s3 | Brahma Reddy Battula | Brahma Reddy Battula |
| [HADOOP-14256](https://issues.apache.org/jira/browse/HADOOP-14256) | [S3A DOC] Correct the format for "Seoul" example | Minor | documentation, fs/s3 | Brahma Reddy Battula | Brahma Reddy Battula |
| [MAPREDUCE-6850](https://issues.apache.org/jira/browse/MAPREDUCE-6850) | Shuffle Handler keep-alive connections are closed from the server side | Major | . | Jonathan Eagles | Jonathan Eagles |
| [HDFS-11592](https://issues.apache.org/jira/browse/HDFS-11592) | Closing a file has a wasteful preconditions in NameNode | Major | namenode | Eric Badger | Eric Badger |
| [YARN-6354](https://issues.apache.org/jira/browse/YARN-6354) | LeveldbRMStateStore can parse invalid keys when recovering reservations | Major | resourcemanager | Jason Lowe | Jason Lowe |
| [YARN-5703](https://issues.apache.org/jira/browse/YARN-5703) | ReservationAgents are not correctly configured | Major | capacity scheduler, resourcemanager | Sean Po | Manikandan R |
| [HADOOP-14268](https://issues.apache.org/jira/browse/HADOOP-14268) | Fix markdown itemization in hadoop-aws documents | Minor | documentation, fs/s3 | Akira Ajisaka | Akira Ajisaka |
| [YARN-6436](https://issues.apache.org/jira/browse/YARN-6436) | TestSchedulingPolicy#testParseSchedulingPolicy timeout is too low | Major | test | Jason Lowe | Eric Badger |
| [YARN-6420](https://issues.apache.org/jira/browse/YARN-6420) | RM startup failure due to wrong order in nodelabel editlog | Critical | . | Bibin A Chundatt | Bibin A Chundatt |
@ -164,7 +177,6 @@
| [HADOOP-14066](https://issues.apache.org/jira/browse/HADOOP-14066) | VersionInfo should be marked as public API | Critical | common | Thejas M Nair | Akira Ajisaka |
| [HADOOP-14293](https://issues.apache.org/jira/browse/HADOOP-14293) | Initialize FakeTimer with a less trivial value | Major | test | Andrew Wang | Andrew Wang |
| [YARN-6461](https://issues.apache.org/jira/browse/YARN-6461) | TestRMAdminCLI has very low test timeouts | Major | test | Jason Lowe | Eric Badger |
| [YARN-6463](https://issues.apache.org/jira/browse/YARN-6463) | correct spelling mistake in FileSystemRMStateStore | Trivial | . | Yeliang Cang | Yeliang Cang |
| [HDFS-11163](https://issues.apache.org/jira/browse/HDFS-11163) | Mover should move the file blocks to default storage once policy is unset | Major | balancer & mover | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [YARN-6450](https://issues.apache.org/jira/browse/YARN-6450) | TestContainerManagerWithLCE requires override for each new test added to ContainerManagerTest | Major | test | Jason Lowe | Jason Lowe |
| [YARN-3760](https://issues.apache.org/jira/browse/YARN-3760) | FSDataOutputStream leak in AggregatedLogFormat.LogWriter.close() | Critical | nodemanager | Daryn Sharp | Haibo Chen |
@ -219,7 +231,7 @@
| [HADOOP-14166](https://issues.apache.org/jira/browse/HADOOP-14166) | Reset the DecayRpcScheduler AvgResponseTime metric to zero when queue is not used | Major | common | Surendra Singh Lilhore | Surendra Singh Lilhore |
| [HDFS-11661](https://issues.apache.org/jira/browse/HDFS-11661) | GetContentSummary uses excessive amounts of memory | Blocker | namenode | Nathan Roberts | Wei-Chiu Chuang |
| [YARN-6141](https://issues.apache.org/jira/browse/YARN-6141) | ppc64le on Linux doesn't trigger \_\_linux get\_executable codepath | Major | nodemanager | Sonia Garudi | Ayappan |
| [HDFS-11445](https://issues.apache.org/jira/browse/HDFS-11445) | FSCK shows overall health stauts as corrupt even one replica is corrupt | Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [HDFS-11445](https://issues.apache.org/jira/browse/HDFS-11445) | FSCK shows overall health status as corrupt even one replica is corrupt | Critical | . | Brahma Reddy Battula | Brahma Reddy Battula |
| [YARN-6643](https://issues.apache.org/jira/browse/YARN-6643) | TestRMFailover fails rarely due to port conflict | Major | test | Robert Kanter | Robert Kanter |
| [HDFS-11817](https://issues.apache.org/jira/browse/HDFS-11817) | A faulty node can cause a lease leak and NPE on accessing data | Critical | . | Kihwal Lee | Kihwal Lee |
| [YARN-6641](https://issues.apache.org/jira/browse/YARN-6641) | Non-public resource localization on a bad disk causes subsequent containers failure | Major | . | Kuhu Shukla | Kuhu Shukla |
@ -242,16 +254,14 @@
| [HADOOP-14512](https://issues.apache.org/jira/browse/HADOOP-14512) | WASB atomic rename should not throw exception if the file is neither in src nor in dst when doing the rename | Major | fs/azure | Duo Xu | Duo Xu |
| [YARN-6585](https://issues.apache.org/jira/browse/YARN-6585) | RM fails to start when upgrading from 2.7 to 2.8 for clusters with node labels. | Blocker | . | Eric Payne | Sunil G |
| [HDFS-11967](https://issues.apache.org/jira/browse/HDFS-11967) | TestJMXGet fails occasionally | Major | . | Arpit Agarwal | Arpit Agarwal |
| [HDFS-11947](https://issues.apache.org/jira/browse/HDFS-11947) | When constructing a thread name, BPOfferService may print a bogus warning message | Minor | datanode | Tsz Wo Nicholas Sze | Weiwei Yang |
| [YARN-6719](https://issues.apache.org/jira/browse/YARN-6719) | Fix findbugs warnings in SLSCapacityScheduler.java | Major | . | Akira Ajisaka | Akira Ajisaka |
| [HADOOP-14540](https://issues.apache.org/jira/browse/HADOOP-14540) | Replace MRv1 specific terms in HostsFileReader | Minor | documentation | Akira Ajisaka | hu xiaodong |
| [HDFS-11995](https://issues.apache.org/jira/browse/HDFS-11995) | HDFS Architecture documentation incorrectly describes writing to a local temporary file. | Minor | documentation | Chris Nauroth | Nandakumar |
| [HDFS-11995](https://issues.apache.org/jira/browse/HDFS-11995) | HDFS Architecture documentation incorrectly describes writing to a local temporary file. | Minor | documentation | Chris Nauroth | Nanda kumar |
| [HDFS-11736](https://issues.apache.org/jira/browse/HDFS-11736) | OIV tests should not write outside 'target' directory. | Major | . | Konstantin Shvachko | Yiqun Lin |
| [YARN-6713](https://issues.apache.org/jira/browse/YARN-6713) | Fix dead link in the Javadoc of FairSchedulerEventLog.java | Minor | documentation | Akira Ajisaka | Weiwei Yang |
| [HADOOP-14533](https://issues.apache.org/jira/browse/HADOOP-14533) | Size of args cannot be less than zero in TraceAdmin#run as its linkedlist | Trivial | common, tracing | Weisen Han | Weisen Han |
| [HDFS-11960](https://issues.apache.org/jira/browse/HDFS-11960) | Successfully closed files can stay under-replicated. | Critical | . | Kihwal Lee | Kihwal Lee |
| [HADOOP-14146](https://issues.apache.org/jira/browse/HADOOP-14146) | KerberosAuthenticationHandler should authenticate with SPN in AP-REQ | Major | security | Daryn Sharp | Daryn Sharp |
| [YARN-5876](https://issues.apache.org/jira/browse/YARN-5876) | TestResourceTrackerService#testGracefulDecommissionWithApp fails intermittently on trunk | Major | . | Varun Saxena | Robert Kanter |
| [YARN-6467](https://issues.apache.org/jira/browse/YARN-6467) | CSQueueMetrics needs to update the current metrics for default partition only | Major | capacity scheduler | Naganarasimha G R | Manikandan R |
| [HADOOP-14024](https://issues.apache.org/jira/browse/HADOOP-14024) | KMS JMX endpoint throws ClassNotFoundException | Critical | kms | Andrew Wang | John Zhuge |
| [YARN-6749](https://issues.apache.org/jira/browse/YARN-6749) | TestAppSchedulingInfo.testPriorityAccounting fails consistently | Major | . | Eric Badger | Naganarasimha G R |
@ -265,6 +275,7 @@
| [MAPREDUCE-6246](https://issues.apache.org/jira/browse/MAPREDUCE-6246) | DBOutputFormat.java appending extra semicolon to query which is incompatible with DB2 | Major | mrv1, mrv2 | ramtin | Gergely Novák |
| [YARN-6428](https://issues.apache.org/jira/browse/YARN-6428) | Queue AM limit is not honored in CS always | Major | . | Bibin A Chundatt | Bibin A Chundatt |
| [YARN-6770](https://issues.apache.org/jira/browse/YARN-6770) | [Docs] A small mistake in the example of TimelineClient | Trivial | docs | Jinjiang Ling | Jinjiang Ling |
| [HADOOP-10829](https://issues.apache.org/jira/browse/HADOOP-10829) | Iteration on CredentialProviderFactory.serviceLoader is thread-unsafe | Major | security | Benoy Antony | Benoy Antony |
| [YARN-6809](https://issues.apache.org/jira/browse/YARN-6809) | Fix typo in ResourceManagerHA.md | Trivial | documentation | Akira Ajisaka | Yeliang Cang |
| [MAPREDUCE-5621](https://issues.apache.org/jira/browse/MAPREDUCE-5621) | mr-jobhistory-daemon.sh doesn't have to execute mkdir and chown all the time | Minor | jobhistoryserver | Shinichi Yamashita | Shinichi Yamashita |
| [YARN-6797](https://issues.apache.org/jira/browse/YARN-6797) | TimelineWriter does not fully consume the POST response | Major | timelineclient | Jason Lowe | Jason Lowe |
@ -306,6 +317,21 @@
| [YARN-7087](https://issues.apache.org/jira/browse/YARN-7087) | NM failed to perform log aggregation due to absent container | Blocker | log-aggregation | Jason Lowe | Jason Lowe |
| [YARN-7051](https://issues.apache.org/jira/browse/YARN-7051) | Avoid concurrent modification exception in FifoIntraQueuePreemptionPlugin | Critical | capacity scheduler, scheduler preemption, yarn | Eric Payne | Eric Payne |
| [HDFS-12364](https://issues.apache.org/jira/browse/HDFS-12364) | [branch-2.8.2] Fix the Compile Error after HDFS-12299 | Blocker | hdfs | Jiandan Yang | Jiandan Yang |
| [YARN-7112](https://issues.apache.org/jira/browse/YARN-7112) | TestAMRMProxy is failing with invalid request | Major | . | Jason Lowe | Jason Lowe |
| [YARN-7076](https://issues.apache.org/jira/browse/YARN-7076) | yarn application -list -appTypes \<appType\> is not working | Blocker | . | Jian He | Jian He |
| [MAPREDUCE-6641](https://issues.apache.org/jira/browse/MAPREDUCE-6641) | TestTaskAttempt fails in trunk | Major | test | Tsuyoshi Ozawa | Haibo Chen |
| [YARN-7083](https://issues.apache.org/jira/browse/YARN-7083) | Log aggregation deletes/renames while file is open | Critical | nodemanager | Daryn Sharp | Jason Lowe |
| [HADOOP-14814](https://issues.apache.org/jira/browse/HADOOP-14814) | Fix incompatible API change on FsServerDefaults to HADOOP-14104 | Blocker | . | Junping Du | Junping Du |
| [YARN-7023](https://issues.apache.org/jira/browse/YARN-7023) | Incorrect ReservationId.compareTo() implementation | Minor | reservation system | Oleg Danilov | Oleg Danilov |
| [HADOOP-14842](https://issues.apache.org/jira/browse/HADOOP-14842) | Hadoop 2.8.2 release build process get stuck due to java issue | Blocker | build | Junping Du | Junping Du |
| [YARN-5195](https://issues.apache.org/jira/browse/YARN-5195) | RM intermittently crashed with NPE while handling APP\_ATTEMPT\_REMOVED event when async-scheduling enabled in CapacityScheduler | Major | resourcemanager | Karam Singh | sandflee |
| [YARN-7034](https://issues.apache.org/jira/browse/YARN-7034) | DefaultLinuxContainerRuntime and DockerLinuxContainerRuntime sends client environment variables to container-executor | Blocker | nodemanager | Miklos Szegedi | Miklos Szegedi |
| [YARN-7249](https://issues.apache.org/jira/browse/YARN-7249) | Fix CapacityScheduler NPE issue when a container preempted while the node is being removed | Blocker | . | Wangda Tan | Wangda Tan |
| [YARN-7325](https://issues.apache.org/jira/browse/YARN-7325) | Remove unused container variable in DockerLinuxContainerRuntime | Minor | nodemanager | Shane Kumpf | Shane Kumpf |
| [YARN-7246](https://issues.apache.org/jira/browse/YARN-7246) | Fix the default docker binary path | Blocker | nodemanager | Shane Kumpf | Shane Kumpf |
| [YARN-7333](https://issues.apache.org/jira/browse/YARN-7333) | container-executor fails to remove entries from a directory that is not writable or executable | Critical | . | Jason Lowe | Jason Lowe |
| [YARN-7230](https://issues.apache.org/jira/browse/YARN-7230) | Document DockerContainerRuntime for branch-2.8 with proper scope and claim as an experimental feature | Blocker | documentation | Junping Du | Shane Kumpf |
| [HADOOP-14958](https://issues.apache.org/jira/browse/HADOOP-14958) | CLONE - Fix source-level compatibility after HADOOP-11252 | Blocker | . | Junping Du | Junping Du |
### TESTS:
@ -346,6 +372,7 @@
| [YARN-2113](https://issues.apache.org/jira/browse/YARN-2113) | Add cross-user preemption within CapacityScheduler's leaf-queue | Major | capacity scheduler | Vinod Kumar Vavilapalli | Sunil G |
| [YARN-6775](https://issues.apache.org/jira/browse/YARN-6775) | CapacityScheduler: Improvements to assignContainers, avoid unnecessary canAssignToUser/Queue calls | Major | capacityscheduler | Nathan Roberts | Nathan Roberts |
| [YARN-6988](https://issues.apache.org/jira/browse/YARN-6988) | container-executor fails for docker when command length \> 4096 B | Major | yarn | Eric Badger | Eric Badger |
| [HDFS-12473](https://issues.apache.org/jira/browse/HDFS-12473) | Change hosts JSON file format | Major | . | Ming Ma | Ming Ma |
### OTHER:
@ -354,3 +381,5 @@
|:---- |:---- | :--- |:---- |:---- |:---- |
| [HADOOP-14344](https://issues.apache.org/jira/browse/HADOOP-14344) | Revert HADOOP-13606 swift FS to add a service load metadata file | Major | . | John Zhuge | John Zhuge |
| [HDFS-11717](https://issues.apache.org/jira/browse/HDFS-11717) | Add unit test for HDFS-11709 StandbyCheckpointer should handle non-existing legacyOivImageDir gracefully | Minor | ha, namenode | Erik Krogen | Erik Krogen |

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# See the License for the specific language governing permissions and
# limitations under the License.
-->
# Apache Hadoop 2.8.2 Release Notes
# "Apache Hadoop" 2.8.2 Release Notes
These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
@ -73,3 +73,6 @@ Reverted HDFS-10797 to fix a scalability regression brought by the commit.
* [HDFS-10326](https://issues.apache.org/jira/browse/HDFS-10326) | *Major* | **Disable setting tcp socket send/receive buffers for write pipelines**
The size of the TCP socket buffers are no longer hardcoded by default. Instead the OS now will automatically tune the size for the buffer.