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https://issues.apache.org/jira/browse/FLINK-2733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316636#comment-15316636
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Till Rohrmann commented on FLINK-2733:
--------------------------------------
The problem seems to be a connection loss to the {{ZooKeeper}} testing server.
Two curator clients lose their connection to the testing server. I suspect that
the testing listener is one of the affected components. As a consequence the
testing listener is no longer notified about the changing leader election and
the test fails.
I assume that this has something to do with the Travis instances and the
resouce consumption, since I couldn't reproduce the problem locally. I propose
to decrease the number of concurrently connected instances and to increase the
connection timeout in order to harden the test case.
> ZooKeeperLeaderElectionTest.testZooKeeperReelection fails
> ---------------------------------------------------------
>
> Key: FLINK-2733
> URL: https://issues.apache.org/jira/browse/FLINK-2733
> Project: Flink
> Issue Type: Bug
> Affects Versions: 0.10.0
> Reporter: Robert Metzger
> Assignee: Till Rohrmann
> Labels: test-stability
>
> I observed a test failure in this run:
> https://travis-ci.org/rmetzger/flink/jobs/81571914
> {code}
> testZooKeeperReelection(org.apache.flink.runtime.leaderelection.ZooKeeperLeaderElectionTest)
> Time elapsed: 109.794 sec <<< FAILURE!
> java.lang.AssertionError: expected:<d6e0ee70-5192-4d44-8989-09f8425feecc> but
> was:<null>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:144)
> at
> org.apache.flink.runtime.leaderelection.ZooKeeperLeaderElectionTest.testZooKeeperReelection(ZooKeeperLeaderElectionTest.java:171)
> Results :
> Failed tests:
> ZooKeeperLeaderElectionTest.testZooKeeperReelection:171
> expected:<d6e0ee70-5192-4d44-8989-09f8425feecc> but was:<null>
> {code}
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