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https://issues.apache.org/jira/browse/KAFKA-10029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113165#comment-17113165
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Ismael Juma commented on KAFKA-10029:
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Good catch. Is this a recent regression?
> Selector.completedReceives should not be modified when channel is closed
> ------------------------------------------------------------------------
>
> Key: KAFKA-10029
> URL: https://issues.apache.org/jira/browse/KAFKA-10029
> Project: Kafka
> Issue Type: Bug
> Components: network
> Affects Versions: 2.5.0
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Major
> Fix For: 2.6.0, 2.5.1
>
>
> Selector.completedReceives are processed using `forEach` by SocketServer and
> NetworkClient when processing receives from a poll. Since we may close
> channels while processing receives, changes to the map while closing channels
> can result in ConcurrentModificationException. We clear the entire map after
> each poll anyway, so we don't need to remove channel from the map while
> closing channels.
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