1u0 commented on a change in pull request #9383: [FLINK-13248] [runtime] Adding 
processing of downstream messages in AsyncWaitOperator's wait loops
URL: https://github.com/apache/flink/pull/9383#discussion_r314291085
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/AbstractStreamOperator.java
 ##########
 @@ -227,11 +230,30 @@ public void setup(StreamTask<?, ?> containingTask, 
StreamConfig config, Output<S
                }
 
                this.runtimeContext = new StreamingRuntimeContext(this, 
environment, container.getAccumulatorMap());
+               this.taskMailboxExecutor = 
this.getContainingTask().getTaskMailboxExecutor(this);
 
                stateKeySelector1 = config.getStatePartitioner(0, 
getUserCodeClassloader());
                stateKeySelector2 = config.getStatePartitioner(1, 
getUserCodeClassloader());
        }
 
+       /**
+        * Allows downstream operators in the operator chain to process of 
events.
 
 Review comment:
   Suggestion: "... to process ~of~ events."

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