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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-540) Race condition causing RM to potentially relaunch already unregistered AMs on RM restart
Date Thu, 05 Sep 2013 18:06:53 GMT

    [ https://issues.apache.org/jira/browse/YARN-540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13759268#comment-13759268
] 

Jian He commented on YARN-540:
------------------------------

bq.  Is that behavior change being implemented in the YARN API layer?
IMHO, for work-preserving restart, after RM comes back, RM should be able to accept the old
AM as normal instead of asking the AM to reboot or making NM kill the AM container(which currently
happens). Then on RM side, AM unregistering just happens like a normal unregistering, even
though RM had restarted. 
                
> Race condition causing RM to potentially relaunch already unregistered AMs on RM restart
> ----------------------------------------------------------------------------------------
>
>                 Key: YARN-540
>                 URL: https://issues.apache.org/jira/browse/YARN-540
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-540.1.patch, YARN-540.2.patch, YARN-540.3.patch, YARN-540.patch,
YARN-540.patch
>
>
> When job succeeds and successfully call finishApplicationMaster, RM shutdown and restart-dispatcher
is stopped before it can process REMOVE_APP event. The next time RM comes back, it will reload
the existing state files even though the job is succeeded

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