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https://issues.apache.org/jira/browse/KAFKA-21106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Schofield resolved KAFKA-21106.
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Resolution: Fixed
> Share consumer leaks ShareCompletedFetch when two fetches for the same
> partition are merged before collection
> -------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-21106
> URL: https://issues.apache.org/jira/browse/KAFKA-21106
> Project: Kafka
> Issue Type: Bug
> Reporter: Apoorv Mittal
> Assignee: Apoorv Mittal
> Priority: Blocker
> Fix For: 4.4.0
>
>
> ShareConsumeRequestManager.fetch() fetches on every poll() regardless of
> whether the previous fetch response for a partition was collected, so two
> completed fetches for the same partition can end up queued at once.
> ShareFetchCollector then merges them via ShareInFlightBatch.merge(), which
> copied the absorbed batch's records but never cleared them. That batch's
> ShareCompletedFetch leaks forever in
> ShareFetchBuffer.pendingAcknowledgementFetches, along with its retained
> records.
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