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https://issues.apache.org/jira/browse/HADOOP-17861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040919#comment-18040919
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ASF GitHub Bot commented on HADOOP-17861:
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github-actions[bot] closed pull request #3326: HADOOP-17861. improve YARN
Registry DNS Server qps
URL: https://github.com/apache/hadoop/pull/3326
> improve YARN Registry DNS Server qps
> ------------------------------------
>
> Key: HADOOP-17861
> URL: https://issues.apache.org/jira/browse/HADOOP-17861
> Project: Hadoop Common
> Issue Type: Improvement
> Components: registry
> Affects Versions: 3.1.2
> Reporter: YUBI LEE
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> There are some points to improve the performance of YARN Registry DNS Server.
> - Do not print unnecessary logs (It just needs change log4j.properties)
> -- log4j.logger.org.apache.hadoop.registry.server.dns=WARN
> - Change some loglevels at points which can affect performance degradation.
> - Use "newFixedThreadPool" instead of "newCachedThreadPool" to prevent OOM
> - Use Blocking on TCP handler. Using non-blocking and sleeping some
> time("Thread.sleep(500)") is meaningless.
> In our environment, QPS of original yarn dns server is about 5000 (UDP), 100
> (TCP).
> Now, QPS of our improved yarn dns server is about 47000 (UDP), 500 (TCP).
> I will make a pull request at https://github.com/apache/hadoop soon.
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