[YARN-5272] Handle queue names consistently in FairScheduler

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.9.0, 3.0.0-alpha1
• Component/s: fairscheduler
• Hadoop Flags: Reviewed
• Assignee: Wilfred Spiegelenburg
• Reporter: Wilfred Spiegelenburg
• Created: 18/Jun/16 13:34
• Updated: 26/Feb/20 05:29
• Resolved: 15/Jul/16 21:56

Description

The fix used in YARN-3241 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

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