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https://issues.apache.org/jira/browse/KAFKA-12983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420155#comment-17420155
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Matthias J. Sax commented on KAFKA-12983:
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[~ableegoldman] Do we actually know if 2.6 is also affected?
> onJoinPrepare is not always invoked before joining the group
> ------------------------------------------------------------
>
> Key: KAFKA-12983
> URL: https://issues.apache.org/jira/browse/KAFKA-12983
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Reporter: A. Sophie Blee-Goldman
> Assignee: A. Sophie Blee-Goldman
> Priority: Blocker
> Fix For: 2.7.2, 2.8.1, 3.0.0
>
>
> As the title suggests, the #onJoinPrepare callback is not always invoked
> before a member (re)joins the group, but only once when it first enters the
> rebalance. This means that any updates or events that occur during the join
> phase can be lost in the internal state: for example, clearing the
> SubscriptionState (and thus the "ownedPartitions" that are used for
> cooperative rebalancing) after losing its memberId during a rebalance.
> We should reset the `needsJoinPrepare` flag inside the resetStateAndRejoin()
> method
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