Wilfred Spiegelenburg created YARN-5272:
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             Summary: FairScheduler handles "invalid" queue names 
inconsistently even after YARN-3241
                 Key: YARN-5272
                 URL: https://issues.apache.org/jira/browse/YARN-5272
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 2.8.0
            Reporter: Wilfred Spiegelenburg
            Assignee: Wilfred Spiegelenburg


The fix used in YARN-3214 uses a the JDK trim() method to remove leading and 
trailing spaces. The QueueMetrics uses a guava based trim when it splits the 
queues.

The guava based trim uses the unicode definition of a white space which is 
different than the java trim as can be seen 
[here|https://docs.google.com/a/cloudera.com/spreadsheets/d/1kq4ECwPjHX9B8QUCTPclgsDCXYaj7T-FlT4tB5q3ahk/pub]

A queue name with a non-breaking white space will thus still cause the same 
"Metrics source XXX already exists!" MetricsException.



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