lindong28 commented on code in PR #22670:
URL: https://github.com/apache/flink/pull/22670#discussion_r1244852829


##########
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/SchedulerBase.java:
##########
@@ -236,6 +239,16 @@ public SchedulerBase(
         this.exceptionHistory =
                 new BoundedFIFOQueue<>(
                         
jobMasterConfiguration.getInteger(WebOptions.MAX_EXCEPTION_HISTORY_SIZE));
+
+        this.finishingTasks = createFinishingTasks();
+    }
+
+    private Map<JobVertexID, BitSet> createFinishingTasks() {
+        Map<JobVertexID, BitSet> map = new HashMap<>();
+        for (ExecutionJobVertex vertex : 
getExecutionGraph().getAllVertices().values()) {
+            map.put(vertex.getJobVertexId(), new BitSet());

Review Comment:
   Suppose all subtasks of a job vertex have finished and then the job is 
restarted, will JM still allocate a slot to deploy this job vertex? If yes, 
then it seems like a waste of slot resource and we probably should fix it.
   
   Can you help provide the link to the code or doc that verifies the above 
behavior?



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