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https://issues.apache.org/jira/browse/KAFKA-19840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Schofield resolved KAFKA-19840.
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Fix Version/s: 4.2.0
Resolution: Fixed
> Flaky test ShareConsumerTest. testShareGroupMaxSizeConfigExceeded
> -----------------------------------------------------------------
>
> Key: KAFKA-19840
> URL: https://issues.apache.org/jira/browse/KAFKA-19840
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Sanskar Jhajharia
> Assignee: Andrew Schofield
> Priority: Major
> Fix For: 4.2.0
>
>
> The test has been observed as flaky in the recent runs:
> [https://develocity.apache.org/scans/tests?search.names=CI%20workflow%2CGit%20repository&search.relativeStartTime=P28D&search.rootProjectNames=kafka&search.tags=github%2Ctrunk&search.tasks=test&search.timeZoneId=Asia%2FCalcutta&search.values=CI%2Chttps:%2F%2Fgithub.com%2Fapache%2Fkafka&tests.container=org.apache.kafka.clients.consumer.ShareConsumerTest&tests.sortField=FLAKY&tests.test=testShareGroupMaxSizeConfigExceeded()%5B1%5D]
>
>
> After tracing the failures, the root cause was narrowed down to commit
> [https://github.com/apache/kafka/commit/87657fdfc721055835f5b1f22151c461e85eab4a].
> This change introduced a new try/catch around
> {{handleCompletedAcknowledgements()}} in {{{}ShareConsumerImpl.java{}}}. The
> side effect is that all exceptions coming from the commit callback —
> including GroupMaxSizeReachedException — are now swallowed and only logged,
> preventing the test from ever receiving the exception.
> - If the ack callback fires while {{poll()}} is executing → exception is
> caught & swallowed → test times out
> - If the callback fires outside that path → exception escapes → test passes
> So the same test randomly passes/fails depending on scheduling of the ack
> callback.
> Also, the test testAcknowledgementCommitCallbackThrowsException has been
> marked as Flaky for the same Root cause.
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