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Posted to issues@flink.apache.org by "Andrey Zagrebin (Jira)" <ji...@apache.org> on 2020/07/20 13:22:00 UTC

[jira] [Commented] (FLINK-18646) Managed memory released check can block RPC thread

    [ https://issues.apache.org/jira/browse/FLINK-18646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17161235#comment-17161235 ] 

Andrey Zagrebin commented on FLINK-18646:
-----------------------------------------

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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