Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/1896#issuecomment-51850997
  
    When run as part of the whole test suite, `manager.myLocalityLevels` is 
`Array(PROCESS_LOCAL, NODE_LOCAL, RACK_LOCAL, ANY)`, whereas it's 
`Array(PROCESS_LOCAL, NODE_LOCAL, ANY)` when running only that test.  I see 
similar issues if I re-order the tests and run the entire suite.
    
    Even if this isn't a necessary part of the test, it's worrying to have 
order-sensitivity/ interdependency between tests, so I'd like to understand why 
this is happening.


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