[jira] [Created] (HDFS-12897) Path not found when we get the ec policy for a .snapshot dir

2017-12-05 Thread Harshakiran Reddy (JIRA) 
Harshakiran Reddy created HDFS-12897:


 Summary: Path not found when we get the ec policy for a .snapshot 
dir
 Key: HDFS-12897
 URL: https://issues.apache.org/jira/browse/HDFS-12897
 Project: Hadoop HDFS
  Issue Type: Bug
  Components: erasure-coding, hdfs, snapshots
Affects Versions: 3.0.0-alpha1
Reporter: Harshakiran Reddy


Scenario:-
---

bin> ./hdfs ec -getPolicy -path /dir/
2017-12-06 12:51:35,324 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
RS-3-2-1024k
bin> ./hdfs ec -getPolicy -path /dir/.snapshot/
2017-12-06 12:19:52,204 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
{{FileNotFoundException: Path not found: /dir/.snapshot}}
bin> ./hdfs dfs -ls /dir/.snapshot/
2017-12-06 12:20:12,956 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
Found 2 items
drwxr-xr-x   - user group  0 2017-12-05 12:27 /dir/.snapshot/s1
drwxr-xr-x   - user group  0 2017-12-05 12:28 /dir/.snapshot/s2
bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/.snapshot/
2017-12-06 12:24:10,729 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
{{The storage policy of /dir/.snapshot/ is unspecified}}
bin> ./hdfs storagepolicies -getStoragePolicy -path /dir/
2017-12-06 12:50:17,010 WARN util.NativeCodeLoader: Unable to load 
native-hadoop library for your platform... using builtin-java classes where 
applicable
The storage policy of /dir/:
BlockStoragePolicy{COLD:2, storageTypes=[ARCHIVE], creationFallbacks=[], 
replicationFallbacks=[]}



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[jira] [Created] (HDFS-12896) when set replicate EC policy for a directory or file，it's EC policy cannot be querying by getPolicy command.

2017-12-05 Thread chencan (JIRA) 
chencan created HDFS-12896:
--

 Summary: when set replicate EC policy for a directory or file，it's 
EC policy cannot be querying by getPolicy command.
 Key: HDFS-12896
 URL: https://issues.apache.org/jira/browse/HDFS-12896
 Project: Hadoop HDFS
  Issue Type: Bug
Reporter: chencan


When i set replicate EC policy for ecDir，then query it by getPolicy，it return 
‘The erasure coding policy of /ecDir is unspecified', as follow.

[root@master bin]# hdfs dfs -mkdir /ecDir
[root@master bin]# hdfs ec -setPolicy -path /ecDir -replicate
Set erasure coding policy replication on /ecDir
[root@master bin]# hdfs ec -getPolicy -path /ecDir
The erasure coding policy of /ecDir is unspecified



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[jira] [Created] (HDFS-12895) RBF: Add ACL support for mount table

2017-12-05 Thread Yiqun Lin (JIRA) 
Yiqun Lin created HDFS-12895:


 Summary: RBF: Add ACL support for mount table
 Key: HDFS-12895
 URL: https://issues.apache.org/jira/browse/HDFS-12895
 Project: Hadoop HDFS
  Issue Type: Sub-task
Affects Versions: 3.0.0-alpha3
Reporter: Yiqun Lin
Assignee: Yiqun Lin






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Re: VOTE] Release Apache Hadoop 2.7.5 (RC0)

2017-12-05 Thread Ajay Kumar 
+1  (non-binding)
Thanks for driving this.

--Built from the source.
--Installed 3 Node Cluster.
--Ran basic shell commands.
--Ran sample jobs, pi,wordcount.

Thanks,
Ajay

On 12/1/17, 8:42 PM, "Konstantin Shvachko"  wrote:

Hi everybody,

This is the next dot release of Apache Hadoop 2.7 line. The previous one
2.7.4 was release August 4, 2017.
Release 2.7.5 includes critical bug fixes and optimizations. See more
details in Release Note:
http://home.apache.org/~shv/hadoop-2.7.5-RC0/releasenotes.html

The RC0 is available at: http://home.apache.org/~shv/hadoop-2.7.5-RC0/

Please give it a try and vote on this thread. The vote will run for 5 days
ending 12/08/2017.

My up to date public key is available from:
https://dist.apache.org/repos/dist/release/hadoop/common/KEYS

Thanks,
--Konstantin

[jira] [Created] (HDFS-12894) [READ] Skip setting block count of ProvidedStorageInfo on DN registration update

2017-12-05 Thread Virajith Jalaparti (JIRA) 
Virajith Jalaparti created HDFS-12894:
-

 Summary: [READ] Skip setting block count of ProvidedStorageInfo on 
DN registration update
 Key: HDFS-12894
 URL: https://issues.apache.org/jira/browse/HDFS-12894
 Project: Hadoop HDFS
  Issue Type: Sub-task
Reporter: Virajith Jalaparti
Assignee: Virajith Jalaparti






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[jira] [Created] (HDFS-12893) [READ] Support replication of Provided blocks with non-default topologies.

2017-12-05 Thread Virajith Jalaparti (JIRA) 
Virajith Jalaparti created HDFS-12893:
-

 Summary: [READ] Support replication of Provided blocks with 
non-default topologies.
 Key: HDFS-12893
 URL: https://issues.apache.org/jira/browse/HDFS-12893
 Project: Hadoop HDFS
  Issue Type: Sub-task
Reporter: Virajith Jalaparti






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Re: [DISCUSS] Merge HDFS-9806 to trunk

2017-12-05 Thread Sean Mackrory 
I'm generally supportive of a merge - unless anyone brings up new concerns,
I've been happy with the design, implementation and discussion and it seems
to be at a good checkpoint.

When you get to writing the site documentation - one thing in particular I
think should be called out early in the description of the feature is the
need to create a read-only namespace specific to the remote storage. I can
see this getting merged and more than a few people wanting to know how they
can dynamically mount their remote storage on their existing HDFS cluster
today :)

On Sun, Dec 3, 2017 at 3:43 PM, Chris Douglas  wrote:

> Hey hdfs-dev@-
>
> The HDFS-9806 dev branch is getting ready to merge to trunk. This branch
> adds a new storage type (PROVIDED) to support reading remote data as HDFS
> blocks. Design documentation and discussion are available on JIRA [1].
>
> Over the next week or so, we'll work through the remaining issues, write
> the site documentation, and generally clean up the branch. The current code
> has been stressed in experimental settings, including a large production
> benchmark. When this feature is not enabled and active, it should have no
> effect on HDFS. The merge will checkpoint progress on reading remote data
> through HDFS, setting up work on the write path [2] and improving
> usability.
>
> Please look over the branch and raise issues that should be addressed
> before the merge. -C
>
> [1]: https://issues.apache.org/jira/browse/HDFS-9806
> [2]: https://issues.apache.org/jira/browse/HDFS-12090
>

[jira] [Reopened] (HDFS-12891) TestClusterTopology#testChooseRandom fails intermittently

2017-12-05 Thread Zsolt Venczel (JIRA) 

 [ 
https://issues.apache.org/jira/browse/HDFS-12891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Zsolt Venczel reopened HDFS-12891:
--

> TestClusterTopology#testChooseRandom fails intermittently
> -
>
> Key: HDFS-12891
> URL: https://issues.apache.org/jira/browse/HDFS-12891
> Project: Hadoop HDFS
>  Issue Type: Bug
>Affects Versions: 2.9.0, 3.0.0-beta1, 2.8.2
>Reporter: Zsolt Venczel
>Assignee: Zsolt Venczel
>  Labels: flaky-test
> Fix For: 2.9.0, 3.0.0-beta1, 2.8.3, 3.1.0
>
>
> {noformat}
> java.net.BindException: Problem binding to [localhost:36701] 
> java.net.BindException: Address already in use; For more details see:  
> http://wiki.apache.org/hadoop/BindException
>   at sun.nio.ch.Net.bind0(Native Method)
>   at sun.nio.ch.Net.bind(Net.java:433)
>   at sun.nio.ch.Net.bind(Net.java:425)
>   at 
> sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
>   at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
>   at org.apache.hadoop.ipc.Server.bind(Server.java:546)
>   at org.apache.hadoop.ipc.Server$Listener.(Server.java:955)
>   at org.apache.hadoop.ipc.Server.(Server.java:2655)
>   at org.apache.hadoop.ipc.RPC$Server.(RPC.java:968)
>   at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server.(ProtobufRpcEngine.java:367)
>   at 
> org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:342)
>   at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:810)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:954)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1314)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.(DataNode.java:481)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2611)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2499)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2546)
>   at 
> org.apache.hadoop.hdfs.MiniDFSCluster.restartDataNode(MiniDFSCluster.java:2152)
>   at 
> org.apache.hadoop.hdfs.server.blockmanagement.TestPendingInvalidateBlock.testPendingDeleteUnknownBlocks(TestPendingInvalidateBlock.java:175)
> {noformat}



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[jira] [Created] (HDFS-12892) TestClusterTopology#testChooseRandom fails intermittently

2017-12-05 Thread Zsolt Venczel (JIRA) 
Zsolt Venczel created HDFS-12892:


 Summary: TestClusterTopology#testChooseRandom fails intermittently
 Key: HDFS-12892
 URL: https://issues.apache.org/jira/browse/HDFS-12892
 Project: Hadoop HDFS
  Issue Type: Bug
  Components: test
Affects Versions: 3.0.0
Reporter: Zsolt Venczel


Flaky test failure:
{code:java}
java.lang.AssertionError
Error
Not choosing nodes randomly
Stack Trace
java.lang.AssertionError: Not choosing nodes randomly
at 
org.apache.hadoop.net.TestClusterTopology.testChooseRandom(TestClusterTopology.java:170)
{code}




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[jira] [Resolved] (HDFS-12891) TestClusterTopology#testChooseRandom fails intermittently

2017-12-05 Thread Zsolt Venczel (JIRA) 

 [ 
https://issues.apache.org/jira/browse/HDFS-12891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Zsolt Venczel resolved HDFS-12891.
--
Resolution: Invalid

> TestClusterTopology#testChooseRandom fails intermittently
> -
>
> Key: HDFS-12891
> URL: https://issues.apache.org/jira/browse/HDFS-12891
> Project: Hadoop HDFS
>  Issue Type: Bug
>Affects Versions: 2.9.0, 3.0.0-beta1, 2.8.2
>Reporter: Zsolt Venczel
>Assignee: Eric Badger
>  Labels: flaky-test
> Fix For: 2.8.3, 3.1.0, 3.0.0-beta1, 2.9.0
>
>
> {noformat}
> java.net.BindException: Problem binding to [localhost:36701] 
> java.net.BindException: Address already in use; For more details see:  
> http://wiki.apache.org/hadoop/BindException
>   at sun.nio.ch.Net.bind0(Native Method)
>   at sun.nio.ch.Net.bind(Net.java:433)
>   at sun.nio.ch.Net.bind(Net.java:425)
>   at 
> sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
>   at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
>   at org.apache.hadoop.ipc.Server.bind(Server.java:546)
>   at org.apache.hadoop.ipc.Server$Listener.(Server.java:955)
>   at org.apache.hadoop.ipc.Server.(Server.java:2655)
>   at org.apache.hadoop.ipc.RPC$Server.(RPC.java:968)
>   at 
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server.(ProtobufRpcEngine.java:367)
>   at 
> org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:342)
>   at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:810)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:954)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1314)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.(DataNode.java:481)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2611)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2499)
>   at 
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2546)
>   at 
> org.apache.hadoop.hdfs.MiniDFSCluster.restartDataNode(MiniDFSCluster.java:2152)
>   at 
> org.apache.hadoop.hdfs.server.blockmanagement.TestPendingInvalidateBlock.testPendingDeleteUnknownBlocks(TestPendingInvalidateBlock.java:175)
> {noformat}



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[jira] [Created] (HDFS-12891) TestClusterTopology#testChooseRandom fails intermittently

2017-12-05 Thread Zsolt Venczel (JIRA) 
Zsolt Venczel created HDFS-12891:


 Summary: TestClusterTopology#testChooseRandom fails intermittently
 Key: HDFS-12891
 URL: https://issues.apache.org/jira/browse/HDFS-12891
 Project: Hadoop HDFS
  Issue Type: Bug
Affects Versions: 2.9.0, 3.0.0-beta1, 2.8.2
Reporter: Zsolt Venczel
Assignee: Eric Badger
 Fix For: 2.9.0, 3.0.0-beta1, 2.8.3, 3.1.0


{noformat}
java.net.BindException: Problem binding to [localhost:36701] 
java.net.BindException: Address already in use; For more details see:  
http://wiki.apache.org/hadoop/BindException
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at 
sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.apache.hadoop.ipc.Server.bind(Server.java:546)
at org.apache.hadoop.ipc.Server$Listener.(Server.java:955)
at org.apache.hadoop.ipc.Server.(Server.java:2655)
at org.apache.hadoop.ipc.RPC$Server.(RPC.java:968)
at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Server.(ProtobufRpcEngine.java:367)
at 
org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:342)
at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:810)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.initIpcServer(DataNode.java:954)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1314)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.(DataNode.java:481)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2611)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2499)
at 
org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2546)
at 
org.apache.hadoop.hdfs.MiniDFSCluster.restartDataNode(MiniDFSCluster.java:2152)
at 
org.apache.hadoop.hdfs.server.blockmanagement.TestPendingInvalidateBlock.testPendingDeleteUnknownBlocks(TestPendingInvalidateBlock.java:175)
{noformat}



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[VOTE] Release Apache Hadoop 2.8.3 (RC0)

2017-12-05 Thread Junping Du 
Hi all,
 I've created the first release candidate (RC0) for Apache Hadoop 2.8.3. 
This is our next maint release to follow up 2.8.2. It includes 79 important 
fixes and improvements.

  The RC artifacts are available at: 
http://home.apache.org/~junping_du/hadoop-2.8.3-RC0

  The RC tag in git is: release-2.8.3-RC0

  The maven artifacts are available via repository.apache.org at: 
https://repository.apache.org/content/repositories/orgapachehadoop-1072

  Please try the release and vote; the vote will run for the usual 5 
working days, ending on 12/12/2017 PST time.

Thanks,

Junping

Apache Hadoop qbt Report: branch2+JDK7 on Linux/x86

2017-12-05 Thread Apache Jenkins Server 
For more details, see 
https://builds.apache.org/job/hadoop-qbt-branch2-java7-linux-x86/60/

No changes




-1 overall


The following subsystems voted -1:
asflicense unit xml


The following subsystems voted -1 but
were configured to be filtered/ignored:
cc checkstyle javac javadoc pylint shellcheck shelldocs whitespace


The following subsystems are considered long running:
(runtime bigger than 1h  0m  0s)
unit


Specific tests:

Unreaped Processes :

   hadoop-common:1 
   hadoop-hdfs:16 
   bkjournal:5 
   hadoop-yarn-server-nodemanager:1 
   hadoop-yarn-server-timelineservice:1 
   hadoop-yarn-client:6 
   hadoop-yarn-applications-distributedshell:1 
   hadoop-mapreduce-client-app:2 
   hadoop-mapreduce-client-jobclient:12 
   hadoop-streaming:1 
   hadoop-distcp:4 

Failed junit tests :

   hadoop.http.TestHttpServer 
   hadoop.hdfs.web.TestWebHdfsWithAuthenticationFilter 
   hadoop.hdfs.web.TestWebHdfsWithMultipleNameNodes 
   hadoop.hdfs.web.TestFSMainOperationsWebHdfs 
   hadoop.yarn.server.nodemanager.webapp.TestNMWebServer 
   
hadoop.yarn.server.resourcemanager.reservation.TestCapacityOverTimePolicy 
   
hadoop.yarn.applications.distributedshell.TestDistributedShellWithNodeLabels 
   hadoop.mapred.TestReduceFetch 
   hadoop.mapreduce.security.TestBinaryTokenFile 
   hadoop.mapreduce.security.TestJHSSecurity 
   hadoop.fs.TestFileSystem 
   hadoop.mapreduce.security.TestMRCredentials 
   hadoop.conf.TestNoDefaultsJobConf 
   hadoop.fs.TestDFSIO 
   hadoop.mapred.TestJobSysDirWithDFS 
   hadoop.tools.TestIntegration 
   hadoop.tools.TestDistCpViewFs 
   hadoop.resourceestimator.solver.impl.TestLpSolver 
   hadoop.resourceestimator.service.TestResourceEstimatorService 

Timed out junit tests :

   org.apache.hadoop.log.TestLogLevel 
   org.apache.hadoop.hdfs.TestLeaseRecovery2 
   org.apache.hadoop.hdfs.TestRead 
   org.apache.hadoop.security.TestPermission 
   org.apache.hadoop.hdfs.TestDFSInotifyEventInputStream 
   org.apache.hadoop.hdfs.TestDatanodeLayoutUpgrade 
   org.apache.hadoop.hdfs.TestFileAppendRestart 
   org.apache.hadoop.hdfs.web.TestWebHdfsWithRestCsrfPreventionFilter 
   org.apache.hadoop.hdfs.TestDFSMkdirs 
   org.apache.hadoop.hdfs.TestDFSOutputStream 
   org.apache.hadoop.hdfs.web.TestWebHDFS 
   org.apache.hadoop.hdfs.web.TestWebHDFSXAttr 
   org.apache.hadoop.metrics2.sink.TestRollingFileSystemSinkWithHdfs 
   org.apache.hadoop.hdfs.TestDistributedFileSystem 
   org.apache.hadoop.hdfs.TestReplaceDatanodeFailureReplication 
   org.apache.hadoop.hdfs.TestDFSShell 
   org.apache.hadoop.contrib.bkjournal.TestBootstrapStandbyWithBKJM 
   org.apache.hadoop.contrib.bkjournal.TestBookKeeperJournalManager 
   org.apache.hadoop.contrib.bkjournal.TestBookKeeperHACheckpoints 
   org.apache.hadoop.contrib.bkjournal.TestBookKeeperAsHASharedDir 
   org.apache.hadoop.contrib.bkjournal.TestBookKeeperSpeculativeRead 
   org.apache.hadoop.yarn.server.nodemanager.TestNodeStatusUpdater 
   
org.apache.hadoop.yarn.server.timelineservice.reader.TestTimelineReaderWebServices
 
   org.apache.hadoop.yarn.client.TestRMFailover 
   org.apache.hadoop.yarn.client.cli.TestYarnCLI 
   org.apache.hadoop.yarn.client.TestApplicationClientProtocolOnHA 
   org.apache.hadoop.yarn.client.api.impl.TestYarnClientWithReservation 
   org.apache.hadoop.yarn.client.api.impl.TestYarnClient 
   org.apache.hadoop.yarn.client.api.impl.TestAMRMClient 
   
org.apache.hadoop.yarn.applications.distributedshell.TestDistributedShell 
   org.apache.hadoop.mapreduce.v2.app.TestStagingCleanup 
   org.apache.hadoop.mapreduce.v2.app.TestJobEndNotifier 
   org.apache.hadoop.mapred.lib.TestDelegatingInputFormat 
   org.apache.hadoop.mapred.TestMiniMRClasspath 
   org.apache.hadoop.mapred.TestClusterMapReduceTestCase 
   org.apache.hadoop.mapreduce.TestMapCollection 
   org.apache.hadoop.mapred.TestMRIntermediateDataEncryption 
   org.apache.hadoop.mapred.TestMRTimelineEventHandling 
   org.apache.hadoop.mapred.join.TestDatamerge 
   org.apache.hadoop.mapreduce.security.ssl.TestEncryptedShuffle 
   org.apache.hadoop.mapreduce.TestMapReduce 
   org.apache.hadoop.mapred.TestReduceFetchFromPartialMem 
   org.apache.hadoop.mapred.TestLazyOutput 
   org.apache.hadoop.streaming.TestMultipleCachefiles 
   org.apache.hadoop.tools.TestDistCpSync 
   org.apache.hadoop.tools.TestDistCpWithXAttrs 
   org.apache.hadoop.tools.TestDistCpSyncReverseFromTarget 
   org.apache.hadoop.tools.TestDistCpSyncReverseFromSource 
  

   cc:

   
https://builds.apache.org/job/hadoop-qbt-branch2-java7-linux-x86/60/artifact/out/diff-compile-cc-root.txt
  [4.0K]

   javac:

[jira] [Created] (HDFS-12890) XceiverClient should have upper bound on async requests

2017-12-05 Thread Shashikant Banerjee (JIRA) 
Shashikant Banerjee created HDFS-12890:
--

 Summary: XceiverClient should have upper bound on async requests
 Key: HDFS-12890
 URL: https://issues.apache.org/jira/browse/HDFS-12890
 Project: Hadoop HDFS
  Issue Type: Sub-task
  Components: HDFS-7240
Affects Versions: HDFS-7240
Reporter: Shashikant Banerjee
Assignee: Shashikant Banerjee
 Fix For: HDFS-7240


XceiverClient-ratis maintains upper bound on the no of outstanding async 
requests . XceiverClient
should also impose an upper bound on the no of outstanding async requests 
received from client
for write.



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