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https://issues.apache.org/jira/browse/BEAM-4086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444404#comment-16444404
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Raghu Angadi commented on BEAM-4086:
------------------------------------

{{testUnboundedSourceWithoutBoundedWrapper()}} is the test that occasionally 
hangs. Sent a fix for CPU spinning MockConsumer. As a side effect it seems to 
avoid this flake. 2400 runs for gradle test runs in sequence passed.

I still don't know the root cause, will keep this bug open. 

> KafkaIOTest is flaky
> --------------------
>
>                 Key: BEAM-4086
>                 URL: https://issues.apache.org/jira/browse/BEAM-4086
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-kafka
>    Affects Versions: 2.5.0
>            Reporter: Ismaël Mejía
>            Assignee: Raghu Angadi
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Noticed this while trying to do a simple change in KafkaIO this morning and 
> corroborated with other contributors. If you run `./gradlew -p 
> sdks/java/io/kafka/ clean build` it blocks indefinitely at least 1/3 of the 
> times. However it passes ok with Maven.



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