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https://issues.apache.org/jira/browse/KAFKA-13010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17383513#comment-17383513
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Josep Prat commented on KAFKA-13010:
------------------------------------
To add more to the mystery, I'm running the test until failure and I'm already
over 250 repetitions and can't reproduce the bug (on a i7 CPU 4 cores, 8
threads).
Maybe what I'm about to say it's pretty obvious, but according to the logs you
provide, it seems that when the test fails, TaskManager prints:
{code:java}
Handle new assignment with:
New active tasks: []
New standby tasks: []
Existing active tasks: [0_0]
Existing standby tasks: []
{code}
instead of:
{code:java}
Handle new assignment with:
New active tasks: [0_0]
New standby tasks: []
Existing active tasks: []
Existing standby tasks: []
{code}
(or at least it's what's been printed on my machine when test run
successfully). Notice the "0_0" task being in the "existing active tasks" when
failing instead of being in "new active tasks".
> Flaky test
> org.apache.kafka.streams.integration.TaskMetadataIntegrationTest.shouldReportCorrectCommittedOffsetInformation()
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-13010
> URL: https://issues.apache.org/jira/browse/KAFKA-13010
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Bruno Cadonna
> Assignee: Walker Carlson
> Priority: Major
> Labels: flaky-test
> Attachments:
> TaskMetadataIntegrationTest#shouldReportCorrectEndOffsetInformation.rtf
>
>
> Integration test {{test
> org.apache.kafka.streams.integration.TaskMetadataIntegrationTest.shouldReportCorrectCommittedOffsetInformation()}}
> sometimes fails with
> {code:java}
> java.lang.AssertionError: only one task
> at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:26)
> at
> org.apache.kafka.streams.integration.TaskMetadataIntegrationTest.getTaskMetadata(TaskMetadataIntegrationTest.java:162)
> at
> org.apache.kafka.streams.integration.TaskMetadataIntegrationTest.shouldReportCorrectCommittedOffsetInformation(TaskMetadataIntegrationTest.java:117)
> {code}
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