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https://issues.apache.org/jira/browse/SPARK-47819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Herman van Hövell updated SPARK-47819:
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Fix Version/s: 3.5.2
> Use asynchronous callback for execution cleanup
> -----------------------------------------------
>
> Key: SPARK-47819
> URL: https://issues.apache.org/jira/browse/SPARK-47819
> Project: Spark
> Issue Type: Bug
> Components: Connect
> Affects Versions: 3.5.0, 4.0.0, 3.5.1
> Reporter: Xi Lyu
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0, 3.5.2
>
>
> Expired sessions are regularly checked and cleaned up by a maintenance
> thread. However, currently, this process is synchronous. Therefore, in rare
> cases, interrupting the execution thread of a query in a session can take
> hours, causing the entire maintenance process to stall, resulting in a large
> amount of memory not being cleared.
> We address this by introducing asynchronous callbacks for execution cleanup,
> avoiding synchronous joins of execution threads, and preventing the
> maintenance thread from stalling in the above scenarios. To be more specific,
> instead of calling {{runner.join()}} in ExecutorHolder.close(), we set a
> post-cleanup function as the callback through
> {{{}runner.processOnCompletion{}}}, which will be called asynchronously once
> the execution runner is completed or interrupted. In this way, the
> maintenance thread won't get blocked on {{{}join{}}}ing an execution thread.
>
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