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From "Tao Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8925) Updating distributed node attributes only when necessary
Date Tue, 23 Oct 2018 12:44:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16660592#comment-16660592
] 

Tao Yang commented on YARN-8925:
--------------------------------

Thanks [~cheersyang] for your review and suggestion.
Yes, that makes sense to me. I will update the patch later.

> Updating distributed node attributes only when necessary
> --------------------------------------------------------
>
>                 Key: YARN-8925
>                 URL: https://issues.apache.org/jira/browse/YARN-8925
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 3.2.1
>            Reporter: Tao Yang
>            Assignee: Tao Yang
>            Priority: Major
>              Labels: performance
>         Attachments: YARN-8925.001.patch
>
>
> Currently if distributed node attributes exist, even though there is no change, updating
for distributed node attributes will happen in every heartbeat between NM and RM. Updating
process will hold NodeAttributesManagerImpl#writeLock and may have some influence in a large
cluster. We have found nodes UI of a large cluster is opened slowly and most time it's waiting
for the lock in NodeAttributesManagerImpl. I think this updating should be called only when
necessary to enhance the performance of related process.



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