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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6788) Improve performance of resource profile branch
Date Wed, 02 Aug 2017 18:55:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111528#comment-16111528
] 

Daniel Templeton commented on YARN-6788:
----------------------------------------

My understanding is that making the fields volatile will resolve the issue (post JSR-133 [1],
which landed in JDK 1.5).  There is, however, a performance penalty to using _volatile_ since
it forces all threads to synchronize around the shared state.  I don't have a good feel for
how much of a performance impact it will be.  Probably not a bad idea to test it.

> Improve performance of resource profile branch
> ----------------------------------------------
>
>                 Key: YARN-6788
>                 URL: https://issues.apache.org/jira/browse/YARN-6788
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Sunil G
>            Assignee: Sunil G
>            Priority: Blocker
>         Attachments: YARN-6788-YARN-3926.001.patch, YARN-6788-YARN-3926.002.patch, YARN-6788-YARN-3926.003.patch,
YARN-6788-YARN-3926.004.patch, YARN-6788-YARN-3926.005.patch, YARN-6788-YARN-3926.006.patch,
YARN-6788-YARN-3926.007.patch, YARN-6788-YARN-3926.008.patch, YARN-6788-YARN-3926.009.patch,
YARN-6788-YARN-3926.010.patch, YARN-6788-YARN-3926.011.patch, YARN-6788-YARN-3926.012.patch,
YARN-6788-YARN-3926.013.patch, YARN-6788-YARN-3926.014.patch, YARN-6788-YARN-3926.015.patch,
YARN-6788-YARN-3926.016.patch, YARN-6788-YARN-3926.017.patch, YARN-6788-YARN-3926.018.patch,
YARN-6788-YARN-3926.019.patch, YARN-6788-YARN-3926.020.patch, YARN-6788-YARN-3926.021.patch
>
>
> Currently we could see a 15% performance delta with this branch. 
> Few performance improvements to improve the same.
> Also this patch will handle [comments|https://issues.apache.org/jira/browse/YARN-6761?focusedCommentId=16075418&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16075418]
from [~leftnoteasy].



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