zhihai xu commented on YARN-3241:

Hi [~kasha], many thanks for the review. These are very good suggestions. I 
uploaded a new patch YARN-3241.002.patch, which addressed all your comments. 
Please review it.

> Leading space, trailing space and empty sub queue name may cause 
> MetricsException for fair scheduler
> ----------------------------------------------------------------------------------------------------
>                 Key: YARN-3241
>                 URL: https://issues.apache.org/jira/browse/YARN-3241
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: YARN-3241.000.patch, YARN-3241.001.patch, 
> YARN-3241.002.patch
> Leading space, trailing space and empty sub queue name may cause 
> MetricsException(Metrics source XXX already exists! ) when add application to 
> FairScheduler.
> The reason is because QueueMetrics parse the queue name different from the 
> QueueManager.
> QueueMetrics use Q_SPLITTER to parse queue name, it will remove Leading space 
> and trailing space in the sub queue name, It will also remove empty sub queue 
> name.
> {code}
>   static final Splitter Q_SPLITTER =
>       Splitter.on('.').omitEmptyStrings().trimResults(); 
> {code}
> But QueueManager won't remove Leading space, trailing space and empty sub 
> queue name.
> This will cause out of sync between FSQueue and FSQueueMetrics.
> QueueManager will think two queue names are different so it will try to 
> create a new queue.
> But FSQueueMetrics will treat these two queue names as same queue which will 
> create "Metrics source XXX already exists!" MetricsException.

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