Hong Zhiguo updated YARN-2306:
    Attachment: YARN-2306-2.patch

updated the patch with only the new unit test, since it seems this bug is fixed 
already in trunk.
The unit test succeeded.
I suggest to include this unit test to have regression for this bug.

> leak of reservation metrics (fair scheduler)
> --------------------------------------------
>                 Key: YARN-2306
>                 URL: https://issues.apache.org/jira/browse/YARN-2306
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>            Reporter: Hong Zhiguo
>            Assignee: Hong Zhiguo
>            Priority: Minor
>         Attachments: YARN-2306-2.patch, YARN-2306.patch
> This only applies to fair scheduler. Capacity scheduler is OK.
> When appAttempt or node is removed, the metrics for 
> reservation(reservedContainers, reservedMB, reservedVCores) is not reduced 
> back.
> These are important metrics for administrator. The wrong metrics confuses may 
> confuse them. 

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