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

    https://github.com/apache/spark/pull/19893#discussion_r155373535
  
    --- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala ---
    @@ -34,12 +36,24 @@ abstract class SparkFunSuite
       with Logging {
     // scalastyle:on
     
    +  val threadWhiteList = Set(
    +    "rpc-client.*", "rpc-server.*", "shuffle-client.*", "shuffle-server.*",
    --- End diff --
    
    It would be nice to add comments explaining why the threads are 
whitelisted. Without an explanation to the contrary, I don't think any of these 
should be whitelisted.


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