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https://issues.apache.org/jira/browse/YARN-8789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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BELUGA BEHR reassigned YARN-8789:
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Assignee: BELUGA BEHR
> Add BoundedQueue to AsyncDispatcher
> -----------------------------------
>
> Key: YARN-8789
> URL: https://issues.apache.org/jira/browse/YARN-8789
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: applications
> Affects Versions: 3.2.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Major
>
> I recently came across a scenario where an MR ApplicationMaster was failing
> with an OOM exception. It had many thousands of Mappers and thousands of
> Reducers. It was noted that in the logging that the event-queue of
> {{AsyncDispatcher}} had a very large number of item in it and was seemingly
> never decreasing.
> I started looking at the code and thought it could use some clean up,
> simplification, and the ability to specify a bounded queue so that any
> incoming events are throttled until they can be processed. This will protect
> the ApplicationMaster from a flood of events.
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