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https://issues.apache.org/jira/browse/YARN-6680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054423#comment-16054423
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Hudson commented on YARN-6680:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11886 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/11886/])
YARN-6680. Avoid locking overhead for NO_LABEL lookups. Contributed by
(naganarasimha_gr: rev ee89ac84e68d3e181b75c63f74a0444f9d28146f)
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/ResourceUsage.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/nodelabels/RMNodeLabelsManager.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebApp.java
* (edit)
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/nodelabels/CommonNodeLabelsManager.java
> 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
> Fix For: 3.0.0-alpha4, 2.8.2, 2.9
>
> 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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