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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4014) Support user cli interface in for Application Priority
Date Wed, 19 Aug 2015 13:18:46 GMT

    [ https://issues.apache.org/jira/browse/YARN-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702996#comment-14702996
] 

Sunil G commented on YARN-4014:
-------------------------------

Thanks [~rohithsharma] and [~jianhe] for handling the race condition in {{CS#updateApplicationPriority}}.

I feel there is another race condition other than the *null* case of *currentAttempt* in SchedulerApplication.
When 2nd or subsequent AM attempt is spawned, we are never setting the old attempt as null
in *SchedulerApplication*, correct?
Hence there is a chance that we set priority to old attempt while new attempt is getting created.
As per your new change in {{updateApplicationPriority}}, I feel this case is also handled.

However, I think we may need to make *currentAttempt* also volatile in *SchedulerApplication*.
pls suggest your thoughts.

{code}
private T currentAttempt;
{code}


> Support user cli interface in for Application Priority
> ------------------------------------------------------
>
>                 Key: YARN-4014
>                 URL: https://issues.apache.org/jira/browse/YARN-4014
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: client, resourcemanager
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>         Attachments: 0001-YARN-4014-V1.patch, 0001-YARN-4014.patch, 0002-YARN-4014.patch,
0003-YARN-4014.patch, 0004-YARN-4014.patch, 0004-YARN-4014.patch
>
>
> Track the changes for user-RM client protocol i.e ApplicationClientProtocol changes and
discussions in this jira.



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