[FLINK-7354] test instability in LocalFlinkMiniClusterITCase#testLocalFlinkMiniClusterWithMultipleTaskManagers

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.1.4, 1.2.1, 1.3.2, 1.4.0
• Fix Version/s: 1.4.0
• Component/s: Tests
• Labels: test-stability
• Assignee: Nico Kruber
• Reporter: Nico Kruber
• Created: 02/Aug/17 14:09
• Updated: 10/Aug/17 11:24
• Resolved: 10/Aug/17 11:24

Description

During mvn clean install on the 1.3.2 RC2, I found an inconsistently failing test at LocalFlinkMiniClusterITCase#testLocalFlinkMiniClusterWithMultipleTaskManagers:

testLocalFlinkMiniClusterWithMultipleTaskManagers(org.apache.flink.test.runtime.minicluster.LocalFlinkMiniClusterITCase)  Time elapsed: 34.978 sec  <<< FAILURE!
java.lang.AssertionError: Thread Thread[initialSeedUniquifierGenerator,5,main] was started by the mini cluster, but not shut down
        at org.junit.Assert.fail(Assert.java:88)
        at org.apache.flink.test.runtime.minicluster.LocalFlinkMiniClusterITCase.testLocalFlinkMiniClusterWithMultipleTaskManagers(LocalFlinkMiniClusterITCase.java:168)

Searching the web for that error yields one previous thread on the dev-list, so this seems to be valid for quite old versions of flink, too, but apparently, was never solved:
https://lists.apache.org/thread.html/07ce439bf6d358bd3139541b52ef6b8e8af249a27e09ae10b6698f81@%3Cdev.flink.apache.org%3E

Test environment: Debian 9, openjdk 1.8.0_141-8u141-b15-1~deb9u1-b15

Issue Links

• links to: GitHub Pull Request #4464