KarmaGYZ commented on a change in pull request #16959:
URL: https://github.com/apache/flink/pull/16959#discussion_r695453034



##########
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:
       Ahh. I think I misunderstand it.
   > There should never be a case where we decrease the resource requirement 
such that the result is negative.
   This scenario already exists, that is why we observe multiple "Clearing 
resource requirements of job". The `totalResourceRequirements` will decrease 
each time in `onReleaseTaskManager`. If that is a bug, we should fix it. 
@zentol 

##########
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:
       Ahh. I think I misunderstand it.
   > There should never be a case where we decrease the resource requirement 
such that the result is negative.
   
   This scenario already exists, that is why we observe multiple "Clearing 
resource requirements of job". The `totalResourceRequirements` will decrease 
each time in `onReleaseTaskManager`. If that is a bug, we should fix it. 
@zentol 




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