dlg99 commented on code in PR #16603:
URL: https://github.com/apache/pulsar/pull/16603#discussion_r921383719


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java:
##########
@@ -520,10 +521,19 @@ public synchronized void readEntriesComplete(List<Entry> 
entries, Object ctx) {
             log.debug("[{}] Distributing {} messages to {} consumers", name, 
entries.size(), consumerList.size());
         }
 
-        sendMessagesToConsumers(readType, entries);
+        if (serviceConfig.isDispatcherDispatchMessagesInSubscriptionThread()) {
+            // dispatch messages to a separate thread, but still in order for 
this subscription
+            // sendMessagesToConsumers is responsible for running broker-side 
filters
+            // that may be quite expensive
+            topic.getBrokerService().getTopicOrderedExecutor()
+                    .executeOrdered(name,

Review Comment:
   1. do we care about potential (unchecked) RejectedExecutionException here?
   2. we may need to prevent this code from submitting unlimited amount of 
runnables into that executor / handle long backlog.  



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