eolivelli commented on code in PR #16304:
URL: https://github.com/apache/pulsar/pull/16304#discussion_r913092154


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java:
##########
@@ -205,7 +206,13 @@ public synchronized void removeConsumer(Consumer consumer) 
throws BrokerServiceE
     }
 
     @Override
-    public synchronized void consumerFlow(Consumer consumer, int 
additionalNumberOfMessages) {
+    public void consumerFlow(Consumer consumer, int 
additionalNumberOfMessages) {
+        
topic.getBrokerService().getTopicOrderedExecutor().executeOrdered(topic.getName(),
 SafeRun.safeRun(() -> {
+            internalConsumerFlow(consumer, additionalNumberOfMessages);
+        }));
+    }
+
+    private synchronized void internalConsumerFlow(Consumer consumer, int 
additionalNumberOfMessages) {

Review Comment:
   maybe it won't add costs



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