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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-365) Each NM heartbeat should not generate and event for the Scheduler
Date Wed, 06 Feb 2013 22:05:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572893#comment-13572893
] 

Thomas Graves commented on YARN-365:
------------------------------------

So I'm not sure that this is gaining us anything.  The scheduler still has the same amount
of work to do.  Its either doing it one at a time via multiple events or with these changes
all at once but processing the same number in the list of things stored in the RMNode. I can
see cases where the all at once is actually worse as it will spend more time on a single heartbeat
and potentially not get to other things in the queue like apps added as fast. 
The only way I can see this being beneficial is if we can aggregate the heartbeats and have
the scheduler process less.
                
> Each NM heartbeat should not generate and event for the Scheduler
> -----------------------------------------------------------------
>
>                 Key: YARN-365
>                 URL: https://issues.apache.org/jira/browse/YARN-365
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager, scheduler
>    Affects Versions: 0.23.5
>            Reporter: Siddharth Seth
>            Assignee: Xuan Gong
>         Attachments: Prototype2.txt, Prototype3.txt, YARN-365.1.patch, YARN-365.2.patch,
YARN-365.3.patch
>
>
> Follow up from YARN-275
> https://issues.apache.org/jira/secure/attachment/12567075/Prototype.txt

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