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https://issues.apache.org/jira/browse/FLINK-17554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17196732#comment-17196732
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Robert Metzger commented on FLINK-17554:
----------------------------------------
Resolved in
https://github.com/apache/flink/commit/328c9010a8865fe334e7992fb1421fafeaff165d
> Add release hooks for user code class loader
> --------------------------------------------
>
> Key: FLINK-17554
> URL: https://issues.apache.org/jira/browse/FLINK-17554
> Project: Flink
> Issue Type: New Feature
> Components: Runtime / Coordination
> Affects Versions: 1.11.0
> Reporter: Till Rohrmann
> Assignee: Robert Metzger
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> Release hooks for the user code class loader which are run just before the
> user code class loader is released would allow clean up static references to
> classes of the user code class loader. This is important because these static
> references could prevent the user code classes from being garbage collected
> and eventually causing metaspace OOMs.
> Hence I suggest to extend the {{RuntimeContext}} with an additional method
> {{registerUserCodeClassLoaderReleaseHook(Runnable releaseHook)}} which allows
> the user code to register a release hook for the user code class loader.
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