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https://issues.apache.org/jira/browse/KAFKA-8483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-8483.
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Resolution: Fixed
Fix Version/s: 2.3.0
> Possible reordering of messages by producer after UNKNOWN_PRODUCER_ID error
> ---------------------------------------------------------------------------
>
> Key: KAFKA-8483
> URL: https://issues.apache.org/jira/browse/KAFKA-8483
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Major
> Fix For: 2.3.0
>
>
> The idempotent producer attempts to detect spurious UNKNOWN_PRODUCER_ID
> errors and handle them by reassigning sequence numbers to the inflight
> batches. The inflight batches are tracked in a PriorityQueue. The problem is
> that the reassignment of sequence numbers depends on the iteration order of
> PriorityQueue, which does not guarantee any ordering. So this can result in
> sequence numbers being assigned in the wrong order.
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