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https://issues.apache.org/jira/browse/KAFKA-21096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apoorv Mittal resolved KAFKA-21096.
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Resolution: Fixed
> SharePartition instances pending cleanup even when fenced
> ---------------------------------------------------------
>
> Key: KAFKA-21096
> URL: https://issues.apache.org/jira/browse/KAFKA-21096
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 4.2.0
> Reporter: Apoorv Mittal
> Assignee: Apoorv Mittal
> Priority: Major
> Fix For: 4.4.0, 4.2.2, 4.3.2
>
>
> SharePartition registers Yammer gauges whose suppliers capture the
> SharePartition instance (this::numInFlightRecords and cachedState::size).
> These gauges were never deregistered when a partition was removed from the
> cache, so the metrics registry kept a strong reference to every fenced
> SharePartition (and its cachedState) for the lifetime of the broker.
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