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Posted to yarn-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2017/06/01 16:38:04 UTC

[jira] [Created] (YARN-6680) Avoid locking overhead for NO_LABEL lookups

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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