KarmaGYZ commented on code in PR #23635:
URL: https://github.com/apache/flink/pull/23635#discussion_r1432179061


##########
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/JobMaster.java:
##########
@@ -334,7 +334,9 @@ public void onUnknownDeploymentsOf(
                         .createSlotPoolService(
                                 jid,
                                 createDeclarativeSlotPoolFactory(
-                                        
jobMasterConfiguration.getConfiguration()));
+                                        
jobMasterConfiguration.getConfiguration()),
+                                null,

Review Comment:
   Why not set it according to the configuration?



##########
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/DefaultDeclarativeSlotPool.java:
##########
@@ -118,26 +129,47 @@ public DefaultDeclarativeSlotPool(
         this.totalResourceRequirements = ResourceCounter.empty();
         this.fulfilledResourceRequirements = ResourceCounter.empty();
         this.slotToRequirementProfileMappings = new HashMap<>();
+        this.componentMainThreadExecutor = 
Preconditions.checkNotNull(componentMainThreadExecutor);
+        this.slotRequestMaxInterval = slotRequestMaxInterval;
     }
 
     @Override
     public void increaseResourceRequirementsBy(ResourceCounter increment) {
-        if (increment.isEmpty()) {
+        updateResourceRequirementsBy(
+                increment,
+                () -> totalResourceRequirements = 
totalResourceRequirements.add(increment));
+    }
+
+    private void updateResourceRequirementsBy(
+            @Nonnull ResourceCounter deltaResourceCount, @Nonnull Runnable 
runnable) {
+        if (deltaResourceCount.isEmpty()) {
             return;
         }
-        totalResourceRequirements = totalResourceRequirements.add(increment);
 
-        declareResourceRequirements();
-    }
+        runnable.run();
 
-    @Override
-    public void decreaseResourceRequirementsBy(ResourceCounter decrement) {
-        if (decrement.isEmpty()) {
+        if (slotRequestMaxInterval == null) {
+            declareResourceRequirements();
             return;
         }
-        totalResourceRequirements = 
totalResourceRequirements.subtract(decrement);
 
-        declareResourceRequirements();
+        if (slotRequestMaxIntervalTimeoutFuture != null
+                && !slotRequestMaxIntervalTimeoutFuture.isDone()
+                && !slotRequestMaxIntervalTimeoutFuture.isCancelled()) {
+            slotRequestMaxIntervalTimeoutFuture.cancel(true);
+        }
+        slotRequestMaxIntervalTimeoutFuture =
+                componentMainThreadExecutor.schedule(
+                        this::declareResourceRequirements,
+                        slotRequestMaxInterval.toMilliseconds(),
+                        TimeUnit.MILLISECONDS);
+    }
+
+    @Override
+    public void decreaseResourceRequirementsBy(ResourceCounter decrement) {
+        updateResourceRequirementsBy(
+                decrement,
+                () -> totalResourceRequirements = 
totalResourceRequirements.subtract(decrement));

Review Comment:
   ditto



##########
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/JobMaster.java:
##########
@@ -336,7 +336,8 @@ public void onUnknownDeploymentsOf(
                                 createDeclarativeSlotPoolFactory(
                                         
jobMasterConfiguration.getConfiguration()),
                                 null,
-                                getMainThreadExecutor());
+                                getMainThreadExecutor(),
+                                false);

Review Comment:
   Why not set slotBatchAllocatable according to the configuration?



##########
flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/DefaultDeclarativeSlotPool.java:
##########
@@ -118,26 +129,47 @@ public DefaultDeclarativeSlotPool(
         this.totalResourceRequirements = ResourceCounter.empty();
         this.fulfilledResourceRequirements = ResourceCounter.empty();
         this.slotToRequirementProfileMappings = new HashMap<>();
+        this.componentMainThreadExecutor = 
Preconditions.checkNotNull(componentMainThreadExecutor);
+        this.slotRequestMaxInterval = slotRequestMaxInterval;
     }
 
     @Override
     public void increaseResourceRequirementsBy(ResourceCounter increment) {
-        if (increment.isEmpty()) {
+        updateResourceRequirementsBy(
+                increment,
+                () -> totalResourceRequirements = 
totalResourceRequirements.add(increment));

Review Comment:
   Why not  check whether the ResourceCounter is empty and modify the 
totalResourceRequirements right here?



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