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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1210) During RM restart, RM should start a new attempt only when previous attempt exits for real
Date Sat, 09 Nov 2013 02:54:17 GMT

    [ https://issues.apache.org/jira/browse/YARN-1210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13817964#comment-13817964
] 

Hadoop QA commented on YARN-1210:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12612955/YARN-1210.4.patch
  against trunk revision .

    {color:red}-1 patch{color}.  Trunk compilation may be broken.

Console output: https://builds.apache.org/job/PreCommit-YARN-Build/2398//console

This message is automatically generated.

> During RM restart, RM should start a new attempt only when previous attempt exits for
real
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-1210
>                 URL: https://issues.apache.org/jira/browse/YARN-1210
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Omkar Vinit Joshi
>         Attachments: YARN-1210.1.patch, YARN-1210.2.patch, YARN-1210.3.patch, YARN-1210.4.patch
>
>
> When RM recovers, it can wait for existing AMs to contact RM back and then kill them
forcefully before even starting a new AM. Worst case, RM will start a new AppAttempt after
waiting for 10 mins ( the expiry interval). This way we'll minimize multiple AMs racing with
each other. This can help issues with downstream components like Pig, Hive and Oozie during
RM restart.
> In the mean while, new apps will proceed as usual as existing apps wait for recovery.
> This can continue to be useful after work-preserving restart, so that AMs which can properly
sync back up with RM can continue to run and those that don't are guaranteed to be killed
before starting a new attempt.



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