Ngone51 commented on a change in pull request #27223: [SPARK-30511][CORE] Spark 
marks intentionally killed speculative tasks as pending leads to holding idle 
executors
URL: https://github.com/apache/spark/pull/27223#discussion_r367750785
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
 ##########
 @@ -614,18 +614,24 @@ private[spark] class ExecutorAllocationManager(
             stageAttemptToNumRunningTask -= stageAttempt
           }
         }
-        // If the task failed, we expect it to be resubmitted later. To ensure 
we have
-        // enough resources to run the resubmitted task, we need to mark the 
scheduler
-        // as backlogged again if it's not already marked as such (SPARK-8366)
-        if (taskEnd.reason != Success) {
-          if (totalPendingTasks() == 0) {
-            allocationManager.onSchedulerBacklogged()
-          }
-          if (taskEnd.taskInfo.speculative) {
-            stageAttemptToSpeculativeTaskIndices.get(stageAttempt).foreach 
{_.remove(taskIndex)}
-          } else {
-            stageAttemptToTaskIndices.get(stageAttempt).foreach 
{_.remove(taskIndex)}
-          }
+
+        if (taskEnd.taskInfo.speculative) {
 
 Review comment:
   I think `stageAttemptToSpeculativeTaskIndices` also includes successful 
finished speculative tasks? Remove a successful speculative task will count it 
into pending speculative tasks again.

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