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https://issues.apache.org/jira/browse/YARN-11578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17769904#comment-17769904
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ASF GitHub Bot commented on YARN-11578:
---------------------------------------

hadoop-yetus commented on PR #6120:
URL: https://github.com/apache/hadoop/pull/6120#issuecomment-1738491387

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   |  |   | 148m 21s |  |  |
   
   
   | Subsystem | Report/Notes |
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6120/2/artifact/out/Dockerfile
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   | GITHUB PR | https://github.com/apache/hadoop/pull/6120 |
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   | modules | C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common U: 
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
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> Fix performance issue of permission check in verifyAndCreateRemoteLogDir
> ------------------------------------------------------------------------
>
>                 Key: YARN-11578
>                 URL: https://issues.apache.org/jira/browse/YARN-11578
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Tamas Domok
>            Assignee: Tamas Domok
>            Priority: Major
>              Labels: pull-request-available
>
> YARN-10901 introduced a check to avoid a warn message in NN logs in certain 
> situations (when /tmp/logs is not owned by the yarn user), but it adds 3 
> NameNode calls (create, setpermission, delete) during log aggregation 
> collection, for *every* NM. Meaning, when a YARN job completes, at the YARN 
> log aggregation phase this check is done for every job, from every 
> NodeManager.
> In 30 minutes 4.2 % of all the NameNode calls were due to this in a cluster. 
> "write" calls need a Namesystem writeLock as well, so the impact is bigger.



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