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https://issues.apache.org/jira/browse/KAFKA-12506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317487#comment-17317487
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A. Sophie Blee-Goldman commented on KAFKA-12506:
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It looks like the build might be broken with some unrelated tests that are just
flaky. You can navigate to the tab that says "Tests" at the top on those links
you provided and it will display a lit of the failed tests. eg
https://ci-builds.apache.org/blue/organizations/jenkins/Kafka%2Fkafka-pr/detail/PR-10432/7/tests
You might not see those when running locally. Some tests are just flaky when
run on Jenkins, like
org.apache.kafka.streams.integration.KTableKTableForeignKeyInnerJoinMultiIntegrationTest.
Others might not show up because you're only running Streams tests locally,
and they're from another module, like kafka.server.RaftClusterTest
Don't worry about these flaky tests, especially if they're in core or connect,
or anywhere outside of Streams since none of those have a dependency on
Streams. If there are tests failing in Streams, but they're not a class or test
you touched in the PR, then we need to use some judgement to figure out if it
might be due to the changes or just flaky. We can always re-run the tests to
try again.
> Expand AdjustStreamThreadCountTest
> ----------------------------------
>
> Key: KAFKA-12506
> URL: https://issues.apache.org/jira/browse/KAFKA-12506
> Project: Kafka
> Issue Type: Sub-task
> Components: streams, unit tests
> Reporter: A. Sophie Blee-Goldman
> Assignee: Aviral Srivastava
> Priority: Major
> Labels: newbie, newbie++
>
> Right now the AdjustStreamThreadCountTest runs a minimal topology that just
> consumes a single input topic, and doesn't produce any data to this topic.
> Some of the complex concurrency bugs that we've found only showed up when we
> had some actual data to process and a stateful topology:
> [KAFKA-12503|https://issues.apache.org/jira/browse/KAFKA-12503] KAFKA-12500
> See the umbrella ticket for the list of improvements we need to make this a
> more effective integration test
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