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https://issues.apache.org/jira/browse/HDFS-6617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HDFS-6617:
--------------------------------
Resolution: Fixed
Fix Version/s: 2.6.0
3.0.0
Status: Resolved (was: Patch Available)
I committed this to trunk and branch-2. Liang Xie, thank you for contributing
this patch.
> Flake TestDFSZKFailoverController.testManualFailoverWithDFSHAAdmin due to a
> long edit log sync op
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-6617
> URL: https://issues.apache.org/jira/browse/HDFS-6617
> Project: Hadoop HDFS
> Issue Type: Test
> Components: auto-failover, test
> Affects Versions: 3.0.0, 2.5.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Priority: Minor
> Fix For: 3.0.0, 2.6.0
>
> Attachments: HDFS-6617-v2.txt, HDFS-6617.txt
>
>
> Just Hit a false alarm testing while working at HDFS-6614, see
> https://builds.apache.org/job/PreCommit-HDFS-Build/7259//testReport/org.apache.hadoop.hdfs.server.namenode.ha/TestDFSZKFailoverController/testManualFailoverWithDFSHAAdmin/
> After a looking at the log, shows the failure came from a timeout at
> ZKFailoverController.doCedeActive():
> localTarget.getProxy(conf, timeout).transitionToStandby(createReqInfo());
> While stopping active service, see FSNamesystem.stopActiveServices():
> void stopActiveServices() {
> LOG.info("Stopping services started for active state");
> ....
> this corelates with the log:
> "2014-07-01 08:12:50,615 INFO namenode.FSNamesystem
> (FSNamesystem.java:stopActiveServices(1167)) - Stopping services started for
> active state"
> then stopActiveServices will call editLog.close(), which goes to
> endCurrentLogSegment(), see log:
> 2014-07-01 08:12:50,616 INFO namenode.FSEditLog
> (FSEditLog.java:endCurrentLogSegment(1216)) - Ending log segment 1
> but this operation did not finish in 5 seconds, then triggered the timeout:
> 2014-07-01 08:12:55,624 WARN ha.ZKFailoverController
> (ZKFailoverController.java:doCedeActive(577)) - Unable to transition local
> node to standby: Call From asf001.sp2.ygridcore.net/67.195.138.31 to
> localhost:10021 failed on socket timeout exception:
> java.net.SocketTimeoutException: 5000 millis timeout while waiting for
> channel to be ready for read. ch : java.nio.channels.SocketChannel[connected
> local=/127.0.0.1:53965 remote=localhost/127.0.0.1:10021]; For more details
> see: http://wiki.apache.org/hadoop/SocketTimeout
> the logEdit/logSync finally done followed with printStatistics(true):
> 2014-07-01 08:13:05,243 INFO namenode.FSEditLog
> (FSEditLog.java:printStatistics(675)) - Number of transactions: 2 Total time
> for transactions(ms): 0 Number of transactions batched in Syncs: 0 Number of
> syncs: 3 SyncTimes(ms): 14667 74 105
> so obviously, this long sync contributed the timeout, maybe the QA box is
> very slow at that moment, so one possible fix here is setting the default
> fence timeout to a bigger one.
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