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https://issues.apache.org/jira/browse/YARN-7207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183554#comment-16183554
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Yufei Gu commented on YARN-7207:
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There are different symptoms. Single call of getLocalHost is pretty slow due to
some DNS issue, which may cause issue in different components, not only in RM.
I don't think this change will hide anything. It is still observable in that
situation. There is one case we observed is that performance of single call is
fine, you won't notice the slowness at all, then it gets significant slow while
you call it thousands of time with multiple threads. This change helps a lot in
that case. Yes, this patch hides the symptom in that case. To solve it, I filed
YARN-7263.
> Cache the local host name when getting application list in RM
> -------------------------------------------------------------
>
> Key: YARN-7207
> URL: https://issues.apache.org/jira/browse/YARN-7207
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: RM
> Affects Versions: 3.1.0
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Attachments: YARN-7207.001.patch, YARN-7207.002.patch
>
>
> {{getLocalHostName()}} is invoked for generating the report for each
> application, which means it is called 1000 times for each
> {{getApplications()}} if there are 1000 apps in RM. Some user got a
> performance issue when {{getLocalHostName()}} is slow under some network envs.
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