gortiz commented on code in PR #15143:
URL: https://github.com/apache/pinot/pull/15143#discussion_r1975455876


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/QueryRunner.java:
##########
@@ -177,6 +178,12 @@ public void init(PinotConfiguration config, 
InstanceDataManager instanceDataMana
     _executorService =
         ExecutorServiceUtils.create(config, 
Server.MULTISTAGE_EXECUTOR_CONFIG_PREFIX, "query-runner-on-" + port,
             Server.DEFAULT_MULTISTAGE_EXECUTOR_TYPE);
+
+    int maxThreads = 
config.getProperty(Server.CONFIG_OF_MSE_THREADS_HARD_LIMIT, 
Server.DEFAULT_MSE_THREADS_HARD_LIMIT);
+    if (maxThreads > 0) {
+      _executorService = new MaxTasksExecutor(maxThreads, _executorService);
+    }

Review Comment:
   I don't think we should use the provider api here. I'm adding more info why 
and the changes we should apply in case we want to use that API in another 
batch review.



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