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https://issues.apache.org/jira/browse/YARN-6680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated YARN-6680:
------------------------------
Attachment: YARN-6680.patch
Simply maintains a reference to the no-label instances that are already being
seeded into maps. Lookups of the no-label key will use the reference in lieu
of the lock and hash.
Not a perfect solution but provides a significant performance boost until the
maps can be changed to concurrent.
> Avoid locking overhead for NO_LABEL lookups
> -------------------------------------------
>
> Key: YARN-6680
> URL: https://issues.apache.org/jira/browse/YARN-6680
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: YARN-6680.patch
>
>
> Labels are managed via a hash that is protected with a read lock. The lock
> acquire and release are each just as expensive as the hash lookup itself -
> resulting in a 3X slowdown.
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