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Posted to issues@flink.apache.org by "Till Rohrmann (Jira)" <ji...@apache.org> on 2020/08/13 08:20:01 UTC

[jira] [Reopened] (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:all-tabpanel ]

Till Rohrmann reopened FLINK-18646:
-----------------------------------

> 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
>            Assignee: Andrey Zagrebin
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.12.0, 1.11.2
>
>         Attachments: log1.png, log2.png
>
>
> 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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