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https://issues.apache.org/jira/browse/FLINK-18646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17161235#comment-17161235
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Andrey Zagrebin commented on FLINK-18646:
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The easiest solution could be to always wait for GC in another thread.
cc [~trohrmann] [~TsReaper]
> Managed memory released check can block RPC thread
> --------------------------------------------------
>
> Key: FLINK-18646
> URL: https://issues.apache.org/jira/browse/FLINK-18646
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.11.0
> Reporter: Andrey Zagrebin
> Priority: Major
>
> UnsafeMemoryBudget#verifyEmpty, called on slot freeing, needs time to wait on
> GC of all allocated/released managed memory. If there are a lot of segments
> to GC then it can take time to finish the check. If slot freeing happens in
> RPC thread, the GC waiting can block it and TM risks to miss its heartbeat.
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