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https://issues.apache.org/jira/browse/KAFKA-3651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269821#comment-15269821
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Ismael Juma commented on KAFKA-3651:
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[~mgharat], are you planning to submit a PR for this soon?
> Whenever the BufferPool throws a "Failed to allocate memory within the
> configured max blocking time" exception, it should also remove the condition
> object from the waiters deque
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-3651
> URL: https://issues.apache.org/jira/browse/KAFKA-3651
> Project: Kafka
> Issue Type: Bug
> Reporter: Mayuresh Gharat
> Assignee: Mayuresh Gharat
>
> "this.waiters.remove(moreMemory);" should happen before the exception
> is thrown.
> .Otherwise the waiting thread count will never get to 0 after the exception
> and batching will not occur. This is because in the RecordAccumulator.ready
> method the exhausted is set as
> boolean exhausted = this.free.queued() > 0 where free.queued() returns the
> waiters.size().
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