Daryn Sharp created YARN-6680:
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Summary: 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
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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