JiexingLi commented on code in PR #38371:
URL: https://github.com/apache/spark/pull/38371#discussion_r1009014221


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core/src/test/scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala:
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@@ -3089,13 +3089,14 @@ class DAGSchedulerSuite extends SparkFunSuite with 
TempLocalSparkContext with Ti
     submit(finalRdd, Array(0, 1), properties = new Properties())
 
     // Finish the first 2 shuffle map stages.
-    completeShuffleMapStageSuccessfully(0, 0, 2)
+    completeShuffleMapStageSuccessfully(0, 0, 2, Seq("hostA", "hostB"))

Review Comment:
   Yes. The background is that: Wenchen and I were reading the related code, 
but felt confused about why line 3098 says: "Executor lost on hostB, both of 
stage 0 and 1 should be reran.". 
   
   After digging around, we found that stage0 completes in "hostA", "hostB" 
(the default hosts somewhere in the code). But it is not very obvious for 
reader to tell this.
   
   So adding  Seq("hostA", "hostB") to reader to easily get this. I further 
updated the comments too.



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