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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-209) Capacity scheduler doesn't trigger app-activation after adding nodes
Date Wed, 27 Mar 2013 18:29:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615603#comment-13615603
] 

Zhijie Shen commented on YARN-209:
----------------------------------

@Vinod, I tested the patch with the following logic:

1. Launch RM
2. Submit App
3. Check it is pending (Yes)
4. Launch NM
5. Check it is active (Yes)

So, on a single-node cluster the patch works correctly.
                
> Capacity scheduler doesn't trigger app-activation after adding nodes
> --------------------------------------------------------------------
>
>                 Key: YARN-209
>                 URL: https://issues.apache.org/jira/browse/YARN-209
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Bikas Saha
>            Assignee: Zhijie Shen
>             Fix For: 3.0.0
>
>         Attachments: YARN-209.1.patch, YARN-209.2.patch, YARN-209.3.patch, YARN-209.4.patch,
YARN-209-test.patch
>
>
> Say application A is submitted but at that time it does not meet the bar for activation
because of resource limit settings for applications. After that if more hardware is added
to the system and the application becomes valid it still remains in pending state, likely
forever.
> This might be rare to hit in real life because enough NM's heartbeat to the RM before
applications can get submitted. But a change in settings or heartbeat interval might make
it easier to repro. In RM restart scenarios, this will likely hit more if its implemented
by re-playing events and re-submitting applications to the scheduler before the RPC to NM's
is activated.

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