albertobastos commented on code in PR #15143:
URL: https://github.com/apache/pinot/pull/15143#discussion_r1975905037


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/QueryRunner.java:
##########
@@ -174,9 +174,14 @@ public void init(PinotConfiguration config, 
InstanceDataManager instanceDataMana
     String joinOverflowModeStr = 
config.getProperty(CommonConstants.MultiStageQueryRunner.KEY_OF_JOIN_OVERFLOW_MODE);
     _joinOverflowMode = joinOverflowModeStr != null ? 
JoinOverFlowMode.valueOf(joinOverflowModeStr) : null;
 
-    _executorService =
-        ExecutorServiceUtils.create(config, 
Server.MULTISTAGE_EXECUTOR_CONFIG_PREFIX, "query-runner-on-" + port,
-            Server.DEFAULT_MULTISTAGE_EXECUTOR_TYPE);
+    int hardLimit = 
ExecutorServiceUtils.getMultiStageExecutorHardLimit(config);
+    String executorType = Server.DEFAULT_MULTISTAGE_EXECUTOR_TYPE;
+    if (hardLimit > 0) {
+      executorType = "hardlimit";
+    }
+    _executorService = ExecutorServiceUtils.create(config, 
Server.MULTISTAGE_EXECUTOR_CONFIG_PREFIX,
+          "query-runner-on-" + port, executorType);

Review Comment:
   Yep, definitely I overstepped trying to use the Provider API for that.
   
   5a451ae6ca1239c679323725066c457b47d6e2b1



##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/plan/server/ServerPlanRequestUtils.java:
##########
@@ -106,7 +106,7 @@ public static OpChain 
compileLeafStage(OpChainExecutionContext executionContext,
       BiConsumer<PlanNode, MultiStageOperator> relationConsumer,
       boolean explain) {
     long queryArrivalTimeMs = System.currentTimeMillis();
-    MdcExecutor mdcExecutor = new MdcExecutor(executorService) {
+    ExecutorService decoratedExecutor = new MdcExecutor(executorService) {

Review Comment:
   You guessed it... it made sense before, but no longer does. Undone.
   
   5a451ae6ca1239c679323725066c457b47d6e2b1



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