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https://issues.apache.org/jira/browse/ZOOKEEPER-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043588#comment-16043588
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Hadoop QA commented on ZOOKEEPER-2803:
--------------------------------------
-1 overall. GitHub Pull Request Build
+1 @author. The patch does not contain any @author tags.
+0 tests included. The patch appears to be a documentation patch that
doesn't require tests.
-1 javadoc. The javadoc tool appears to have generated 1 warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
-1 findbugs. The patch appears to introduce 48 new Findbugs (version
3.0.1) warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/781//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/781//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output:
https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/781//console
This message is automatically generated.
> Flaky test: org.apache.zookeeper.test.CnxManagerTest.testWorkerThreads
> ----------------------------------------------------------------------
>
> Key: ZOOKEEPER-2803
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2803
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.4.10
> Reporter: Abraham Fine
> Assignee: Abraham Fine
>
> We have noticed on internal executions of the integration tests rare failures
> of org.apache.zookeeper.test.CnxManagerTest.testWorkerThreads.
> {code}
> java.lang.RuntimeException: Unable to run quorum server
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:565)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:520)
> at
> org.apache.zookeeper.test.CnxManagerTest.testWorkerThreads(CnxManagerTest.java:328)
> at
> org.apache.zookeeper.JUnit4ZKTestRunner$LoggedInvokeMethod.evaluate(JUnit4ZKTestRunner.java:52)
> Caused by: java.io.IOException: The current epoch, 0, is older than the last
> zxid, 4294967296
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:546)
> {code}
> along with this strange stack trace in the logs:
> {code}
> java.nio.channels.ClosedByInterruptException
> at
> java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:202)
> at sun.nio.ch.FileChannelImpl.force(FileChannelImpl.java:380)
> at
> org.apache.zookeeper.common.AtomicFileOutputStream.close(AtomicFileOutputStream.java:71)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.writeLongToFile(QuorumPeer.java:1232)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.setCurrentEpoch(QuorumPeer.java:1253)
> at
> org.apache.zookeeper.server.quorum.Learner.syncWithLeader(Learner.java:412)
> at
> org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:83)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:851)
> {code}
> It appears that this failure is related to the usage of {{((FileOutputStream)
> out).getChannel().force(true)}} in {{AtomicFileOutputStream}}.
> {{FileChannel#force}} appears to be interruptible, which is not desirable
> behavior when writing the epoch file. The interrupt may be triggered by the
> repeated starting and shutting down of quorum peers in {{testWorkerThreads}}.
> Branch 3.5 uses {{FileDescriptor#sync}} which is not interruptible and does
> not appear to have the same problem.
> I was able to find another JIRA ticket describing a similar issue here:
> https://issues.apache.org/jira/browse/DERBY-4963
> There is also interesting discussion in ZOOKEEPER-1835 (where the change was
> made for 3.5) although these discussions appear to be Windows centric (we
> noticed the issue on Linux)
> https://issues.apache.org/jira/browse/ZOOKEEPER-1835
> The failure appears to have popped up on "ZOOKEEPER-2297 PreCommit Build
> #3241" but jenkins cleared out the logs (I only still have the test report
> from the mailing list).
> In addition, {{testWorkerThreads}} appears to be failing every few months on
> Solaris on Apache Jenkins (for 3.4 ZooKeeper_branch34_solaris - Build # 1430
> and 3.5 ZooKeeper_branch35_solaris - Build # 387), but at the time I wrote
> this Jenkins had cleaned out the logs from the latest failed run so I have no
> way of determining if the cause is the same.
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