agrawaldevesh commented on a change in pull request #29014:
URL: https://github.com/apache/spark/pull/29014#discussion_r460150480



##########
File path: 
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala
##########
@@ -939,12 +941,43 @@ private[spark] class TaskSchedulerImpl(
 
   override def executorDecommission(
       executorId: String, decommissionInfo: ExecutorDecommissionInfo): Unit = {
+    synchronized {
+      // The scheduler can get multiple decommission updates from multiple 
sources,
+      // and some of those can have isHostDecommissioned false. We merge them 
such that
+      // if we heard isHostDecommissioned ever true, then we keep that one 
since it is
+      // most likely coming from the cluster manager and thus authoritative
+      val oldDecomInfo = executorsPendingDecommission.get(executorId)
+      // Don't bother noting decommissioning for executors that don't have 
running tasks
+      // to prevent a race where the `executorDecommission` can be called 
after `removeExecutor`
+      if (executorIdToRunningTaskIds.contains(executorId) &&

Review comment:
       Oh Okay. So `executorIdToHost` would also work given that it is 
eventually cleaned up when we get a non pending loss reason. I agree that it is 
more "vaguer". Thanks for the tip !




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