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From "yunjiong zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6285) Add option to set max limit on ResourceManager for ApplicationClientProtocol.getApplications
Date Mon, 06 Mar 2017 20:01:32 GMT

    [ https://issues.apache.org/jira/browse/YARN-6285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15897949#comment-15897949
] 

yunjiong zhao commented on YARN-6285:
-------------------------------------

[~sunilg], Totally agree.
This patch is for short time purpose to give cluster admin a choice to prevent RM spend to
much time on GC.
After we deployed this patch and set a limit to 50, in the last two days, our cluster's GC
was doing good.
The top 10 worst case are:
{quote}
0.4960477
0.4992665
0.5180593
0.5804366
0.5876860
0.5885162
0.5900650
0.6041406
0.6474685
0.8865442
{quote}
And total time spend on GC is around 1.5%, compared to before it's much better.

> Add option to set max limit on ResourceManager for ApplicationClientProtocol.getApplications
> --------------------------------------------------------------------------------------------
>
>                 Key: YARN-6285
>                 URL: https://issues.apache.org/jira/browse/YARN-6285
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: yunjiong zhao
>            Assignee: yunjiong zhao
>         Attachments: YARN-6285.001.patch, YARN-6285.002.patch, YARN-6285.003.patch
>
>
> When users called ApplicationClientProtocol.getApplications, it will return lots of data,
and generate lots of garbage on ResourceManager which caused long time GC.
> For example, on one of our RM, when called rest API " http://<rm http address:port>/ws/v1/cluster/apps"
it can return 150MB data which have 944 applications.
> getApplications have limit parameter, but some user might not set it, and then the limit
will be Long.MAX_VALUE.



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