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https://issues.apache.org/jira/browse/FLINK-4052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16651194#comment-16651194
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ASF GitHub Bot commented on FLINK-4052:
---------------------------------------
leanken edited a comment on issue #6853: [FLINK-4052] using non-local
unreachable ip:port to fix unstable Test
testReturnLocalHostAddressUsingHeuristics
URL: https://github.com/apache/flink/pull/6853#issuecomment-430116056
cc @tillrohrmann
Saw a couple of issue relate to testReturnLocalHostAddressUsingHeuristics
unstable failure. Here is my diagnose procedure and proposal to fix this
unstable case.
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> Unstable test ConnectionUtilsTest
> ---------------------------------
>
> Key: FLINK-4052
> URL: https://issues.apache.org/jira/browse/FLINK-4052
> Project: Flink
> Issue Type: Bug
> Components: Tests
> Affects Versions: 1.0.2, 1.3.0
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Critical
> Labels: pull-request-available, test-stability
> Fix For: 1.7.0, 1.6.2, 1.5.5
>
>
> The error is the following:
> {code}
> ConnectionUtilsTest.testReturnLocalHostAddressUsingHeuristics:59
> expected:<testing-worker-linux-docker-e744e561-3361-linux-13/172.17.5.9> but
> was:</127.0.0.1>
> {code}
> The probable cause for the failure is that the test tries to select an unused
> closed port (from the ephemeral range), and then assumes that all connections
> to that port fail.
> If a concurrent test actually uses that port, connections to the port will
> succeed.
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