Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10376#discussion_r49662046
  
    --- Diff: 
core/src/test/scala/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriterSuite.scala
 ---
    @@ -169,6 +170,41 @@ class BypassMergeSortShuffleWriterSuite extends 
SparkFunSuite with BeforeAndAfte
         assert(taskMetrics.memoryBytesSpilled === 0)
       }
     
    +  test("only generate temp shuffle file for non-empty partition") {
    +    // Using exception to test whether only non-empty partition creates 
temp shuffle file,
    --- End diff --
    
    `temporaryFilesCreated` is only cleared in `afterAll()`, so it should 
contain every file which was created even after those files are deleted from 
the disk. Thus, I think we can simplify this test a bit by not relying on the 
exception here: just check that `temporaryFilesCreated.size === 3` while 
`temporaryFilesCreated.count(_.exists()) === 0` after a successful stop.


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