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

    https://github.com/apache/spark/pull/22855#discussion_r229739685
  
    --- Diff: 
core/src/test/scala/org/apache/spark/serializer/KryoSerializerSuite.scala ---
    @@ -456,9 +458,63 @@ class KryoSerializerSuite extends SparkFunSuite with 
SharedSparkContext {
     
       // Regression test for SPARK-7766, an issue where disabling auto-reset 
and enabling
       // reference-tracking would lead to corrupted output when serializer 
instances are re-used
    -  for (referenceTracking <- Set(true, false); autoReset <- Set(true, 
false)) {
    -    test(s"instance reuse with autoReset = $autoReset, referenceTracking = 
$referenceTracking") {
    -      testSerializerInstanceReuse(autoReset = autoReset, referenceTracking 
= referenceTracking)
    +  for {
    +    referenceTracking <- Set(true, false)
    +    autoReset <- Set(true, false)
    +    usePool <- Set(true, false)
    +  } {
    +    test(s"instance reuse with autoReset = $autoReset, referenceTracking = 
$referenceTracking" +
    +      s", usePool = $usePool") {
    +      testSerializerInstanceReuse(
    +        autoReset = autoReset, referenceTracking = referenceTracking, 
usePool = usePool)
    --- End diff --
    
    Likewise i see this is just how the code was written before but the `foo = 
foo` style isn't adding anything IMHO. Feel free to not name args


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