zhuzhurk commented on a change in pull request #16959:
URL: https://github.com/apache/flink/pull/16959#discussion_r696596897



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/DefaultDeclarativeSlotPool.java
##########
@@ -117,7 +117,7 @@ public void increaseResourceRequirementsBy(ResourceCounter 
increment) {
 
     @Override
     public void decreaseResourceRequirementsBy(ResourceCounter decrement) {
-        if (decrement.isEmpty()) {
+        if (decrement.isEmpty() || totalResourceRequirements.isEmpty()) {

Review comment:
       I managed to reproduce the issue with a real job. So I think it is a 
true problem and opened FLINK-24005 to track it.
   The real job log is attached in the JIRA.




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