mridulm commented on code in PR #40393:
URL: https://github.com/apache/spark/pull/40393#discussion_r1142572022
##########
core/src/test/scala/org/apache/spark/scheduler/DAGSchedulerSuite.scala:
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@@ -4595,6 +4595,184 @@ class DAGSchedulerSuite extends SparkFunSuite with
TempLocalSparkContext with Ti
}
}
+ test("SPARK-40082: recomputation of shuffle map stage with no pending
partitions" +
+ "should not hang") {
+
+ initPushBasedShuffleConfs(conf)
+ conf.set(config.SHUFFLE_MERGER_LOCATIONS_MIN_STATIC_THRESHOLD, 3)
+ DAGSchedulerSuite.clearMergerLocs()
+ DAGSchedulerSuite.addMergerLocs(Seq("host1", "host2", "host3"))
+
+ val rddA = new MyRDD(sc, 2, Nil)
+ val shuffleDepA = new ShuffleDependency(rddA, new HashPartitioner(2))
+ val shuffleIdA = shuffleDepA.shuffleId
+
+ val rddB = new MyRDD(sc, 2, List(shuffleDepA), tracker = mapOutputTracker)
+ val shuffleDepB = new ShuffleDependency(rddB, new HashPartitioner(2))
+
+ val rddC = new MyRDD(sc, 2, List(shuffleDepB), tracker = mapOutputTracker)
+
+ submit(rddC, Array(0, 1))
+
+ completeShuffleMapStageSuccessfully(0, 0, 2, Seq("hostA", "hostA"))
+
+ // Fetch failed
+ runEvent(makeCompletionEvent(
+ taskSets(1).tasks(0),
+ FetchFailed(makeBlockManagerId("hostC"), shuffleIdA, 0L, 0, 0,
+ "Fetch failure of task: stageId=1, stageAttempt=0, partitionId=0"),
+ result = null))
+
+ // long running task complete
+ completeShuffleMapStageSuccessfully(1, 0, 2, Seq("hostA", "hostA"))
+ assert(!shuffleDepB.shuffleMergeFinalized)
+
+ // stage1`s tasks have all completed
+ val shuffleStage1 =
scheduler.stageIdToStage(1).asInstanceOf[ShuffleMapStage]
+ assert(shuffleStage1.pendingPartitions.isEmpty)
+
+ // resubmit
+ scheduler.resubmitFailedStages()
+
+ // complete parentStage0
+ completeShuffleMapStageSuccessfully(0, 0, 2, Seq("hostA", "hostA"))
+
+ // stage1 should be shuffleMergeFinalized
+ assert(shuffleDepB.shuffleMergeFinalized)
+ }
+
+ for (pushBasedShuffleEnabled <- Seq(true, false)) {
+ test("SPARK-40082: recomputation of shuffle map stage with no pending
partitions should not " +
+ s"hang. pushBasedShuffleEnabled = $pushBasedShuffleEnabled") {
Review Comment:
Good question - I have not tried that :-)
Does specifying pushBasedShuffleEnabled = true in that string work ?
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