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https://issues.apache.org/jira/browse/YARN-7401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Templeton updated YARN-7401:
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Attachment: YARN-7401.001.patch
To get rid of the lock in {{getClusterCapacity()}}, I moved the copy from
{{clusterCapacity}} to where {{clusterCapacity}} is modified. Then by making
{{staleClusterCapacity}} volatile, I can remove the lock. Tests shows a
significant fair scheduler performance increase with this patch. I suspect
capacity scheduler will also benefit.
> Reduce lock contention in ClusterNodeTracker#getClusterResource()
> -----------------------------------------------------------------
>
> Key: YARN-7401
> URL: https://issues.apache.org/jira/browse/YARN-7401
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: resourcemanager
> Affects Versions: 3.1.0
> Reporter: Daniel Templeton
> Assignee: Daniel Templeton
> Attachments: YARN-7401.001.patch
>
>
> Profiling the code shows massive latency in
> {{ClusterNodeTracker.getClusterResource()}} on getting the lock.
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