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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-209) Capacity scheduler can leave application in pending state
Date Thu, 21 Mar 2013 18:57:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13609303#comment-13609303
] 

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

Whenever more hardware is added to the cluster, LeafQueue#updateClusterResource will be triggered.
The problem can be fixed by the patch for YARN-474 as well.
                
> Capacity scheduler can leave application in pending state
> ---------------------------------------------------------
>
>                 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-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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