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https://issues.apache.org/jira/browse/YARN-3241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated YARN-3241:
----------------------------
    Attachment:     (was: YARN-3241.000.patch)

> 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
>
>
> 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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