sohami commented on a change in pull request #1504: DRILL-6792: Find the right 
probe side fragment wrapper & fix DrillBuf…
URL: https://github.com/apache/drill/pull/1504#discussion_r236405542
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/work/filter/RuntimeFilterSink.java
 ##########
 @@ -74,32 +70,43 @@
 
   private SendingAccountor sendingAccountor;
 
+  private  AsyncAggregateWorker asyncAggregateWorker;
+
+  private AtomicBoolean running = new AtomicBoolean(true);
+
   private static final Logger logger = 
LoggerFactory.getLogger(RuntimeFilterSink.class);
 
 
   public RuntimeFilterSink(DrillbitContext drillbitContext, SendingAccountor 
sendingAccountor)
   {
     this.drillbitContext = drillbitContext;
     this.sendingAccountor = sendingAccountor;
-    AsyncAggregateWorker asyncAggregateWorker = new AsyncAggregateWorker();
-    drillbitContext.getExecutor().submit(asyncAggregateWorker);
   }
 
   public void add(RuntimeFilterWritable runtimeFilterWritable)
   {
+    if (asyncAggregateWorker == null) {
+      asyncAggregateWorker = new AsyncAggregateWorker();
+      drillbitContext.getExecutor().submit(asyncAggregateWorker);
+    }
 
 Review comment:
   Should be done once in constructor. Putting here has issues such that 
multiple netty threads can create multiple `asyncAggregateWorker` thread and 
leak all except the last set one.

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