walterddr commented on code in PR #11205:
URL: https://github.com/apache/pinot/pull/11205#discussion_r1280081624


##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/MultiStageBrokerRequestHandler.java:
##########
@@ -115,13 +116,14 @@ public MultiStageBrokerRequestHandler(PinotConfiguration 
config, String brokerId
 
     long releaseMs = 
config.getProperty(QueryConfig.KEY_OF_SCHEDULER_RELEASE_TIMEOUT_MS,
         QueryConfig.DEFAULT_SCHEDULER_RELEASE_TIMEOUT_MS);
-    _reducerScheduler = new OpChainSchedulerService(new 
RoundRobinScheduler(releaseMs),
+    _reducerScheduler = new OpChainSchedulerService(
         Executors.newCachedThreadPool(new 
NamedThreadFactory("query_broker_reducer_" + _reducerPort + "_port")));
-    _mailboxService = new MailboxService(_reducerHostname, _reducerPort, 
config, _reducerScheduler::onDataAvailable);
+    _mailboxService = new MailboxService(_reducerHostname, _reducerPort, 
config);
 
     // TODO: move this to a startUp() function.
-    _reducerScheduler.startAsync();
     _mailboxService.start();
+    //TODO: make this configurable
+    _opChainExecutor = new OpChainExecutor(new 
NamedThreadFactory("op_chain_worker_on_" + _reducerPort + "_port"));

Review Comment:
   shoudl also set this opChainExecutor to the _reducerScheduler in line 120



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