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Posted to yarn-issues@hadoop.apache.org by "Jian He (JIRA)" <ji...@apache.org> on 2014/11/12 00:04:34 UTC

[jira] [Commented] (YARN-2853) Killing app may hang while AM is unregistering

    [ https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207292#comment-14207292 ] 

Jian He commented on YARN-2853:
-------------------------------

Instead, we could get rid of the killing state completely and let app stay at the original state and change RMApp to handle attempt_killed state at each possible state.  this way, we could avoid race condition like this.  I'll file a separate  jira to do this.

> Killing app may hang while AM is unregistering
> ----------------------------------------------
>
>                 Key: YARN-2853
>                 URL: https://issues.apache.org/jira/browse/YARN-2853
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-2853.1.patch
>
>
> When killing an app, app first moves to KILLING state, If RMAppAttempt receives the attempt_unregister event before attempt_kill event,  it'll ignore the later attempt_kill event.  Hence, RMApp won't be able to move to KILLED state and stays at KILLING state forever.



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