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https://issues.apache.org/jira/browse/ZOOKEEPER-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043538#comment-16043538
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ASF GitHub Bot commented on ZOOKEEPER-2803:
-------------------------------------------
GitHub user afine opened a pull request:
https://github.com/apache/zookeeper/pull/277
ZOOKEEPER-2803 Flaky test:
org.apache.zookeeper.test.CnxManagerTest.testWorkerThreads
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/afine/zookeeper ZOOKEEPER-2803
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zookeeper/pull/277.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #277
----
commit 0a6ada6ba25ab3d4b2094a4c5f1842a9a0b67dfc
Author: Abraham Fine <[email protected]>
Date: 2017-06-08T22:10:41Z
ZOOKEEPER-2803: Flaky test:
org.apache.zookeeper.test.CnxManagerTest.testWorkerThreads
----
> 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
> {{testWorkerThreads}} appears to be failing every few months on Solaris on
> Apache Jenkins (for 3.4 and 3.5), 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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