walterddr commented on code in PR #10289:
URL: https://github.com/apache/pinot/pull/10289#discussion_r1110438714


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/executor/RoundRobinScheduler.java:
##########
@@ -79,128 +69,145 @@ public RoundRobinScheduler(long releaseTimeout) {
   public RoundRobinScheduler(long releaseTimeoutMs, Supplier<Long> ticker) {
     _releaseTimeout = releaseTimeoutMs;
     _ticker = ticker;
+    _availableOpChainReleaseService = 
Executors.newSingleThreadScheduledExecutor(r -> {
+      Thread t = new Thread(r);
+      t.setName(AVAILABLE_RELEASE_THREAD_NAME);
+      t.setDaemon(true);
+      return t;
+    });
+    if (releaseTimeoutMs > 0) {
+      _availableOpChainReleaseService.scheduleAtFixedRate(() -> {
+        for (Map.Entry<OpChainId, Long> entry : _available.entrySet()) {
+          if (Thread.interrupted()) {
+            LOGGER.warn("Thread={} interrupted. Scheduler may be shutting 
down.", AVAILABLE_RELEASE_THREAD_NAME);
+            break;
+          }
+          OpChainId opChainId = entry.getKey();
+          if (_ticker.get() + _releaseTimeout > entry.getValue()) {
+            _lock.lock();
+            try {
+              if (_available.containsKey(opChainId)) {
+                _available.remove(opChainId);
+                _ready.offer(_aliveChains.get(opChainId));

Review Comment:
   it is possible that _aliveChains as already removed this opChainId?



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