Github user shivaram commented on the pull request:

    https://github.com/apache/spark/pull/4783#issuecomment-78407056
  
    @advancedxy Do the tests pass on your local machine ? It looks the 
ExternalSorter uses a size-tracking hash map which in turn depends on the 
SizeEstimator. So I am wondering if the test failure is actually related to 
this PR.


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