jihoonson commented on a change in pull request #6629: Add support parallel 
combine in brokers
URL: https://github.com/apache/incubator-druid/pull/6629#discussion_r240882286
 
 

 ##########
 File path: 
core/src/main/java/org/apache/druid/collections/DefaultBlockingPool.java
 ##########
 @@ -70,10 +70,34 @@ public int maxSize()
     return maxSize;
   }
 
-  @VisibleForTesting
-  public int getPoolSize()
+  @Override
+  public int available()
   {
-    return objects.size();
+    final ReentrantLock lock = this.lock;
+    lock.lock();
 
 Review comment:
   Ah, that's a good point. I changed this to `VisibleForTesting` and 
`takeBatch()` to return the number of remaining resources. Thanks!

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