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https://issues.apache.org/jira/browse/KAFKA-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15232821#comment-15232821
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ASF GitHub Bot commented on KAFKA-3528:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1201
> AbstractCoordinator wakeup during rebalance can cause spurious rebalances
> -------------------------------------------------------------------------
>
> Key: KAFKA-3528
> URL: https://issues.apache.org/jira/browse/KAFKA-3528
> Project: Kafka
> Issue Type: Bug
> Components: consumer, KafkaConnect
> Affects Versions: 0.9.0.0, 0.9.0.1
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Fix For: 0.10.1.0
>
>
> If the user calls wakeup() while a rebalance is pending, the join/sync will
> be left on the wire. Although the requests will eventually complete on a
> later call to poll(), since we have aborted the call to ensureActiveGroup(),
> the onJoinComplete() callback will never be invoked. This causes a spurious
> rebalance on the next poll() since we never received the assignment for the
> joined generation. This also affects Kafka Connect, which depends internally
> on the group management protocol and uses wakeup to break from poll() in
> order to handle requests.
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