Hadoop QA commented on YARN-3241:

{color:green}+1 overall{color}.  Here are the results of testing the latest 
  against trunk revision 402817c.

    {color:green}+1 @author{color}.  The patch does not contain any @author 

    {color:green}+1 tests included{color}.  The patch appears to include 3 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in 

Test results: 
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/7014//console

This message is automatically generated.

> 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: scheduler
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>         Attachments: YARN-3241.000.patch, YARN-3241.001.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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