Github user kl0u commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3484#discussion_r105401503
  
    --- Diff: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/OperatorChain.java
 ---
    @@ -387,14 +403,25 @@ public int getChainLength() {
     
                protected final StreamStatusProvider streamStatusProvider;
     
    -           public ChainingOutput(OneInputStreamOperator<T, ?> operator, 
StreamStatusProvider streamStatusProvider) {
    +           protected final OutputTag<T> outputTag;
    +
    +           public ChainingOutput(
    +                           OneInputStreamOperator<T, ?> operator,
    +                           StreamStatusProvider streamStatusProvider,
    +                           OutputTag<T> outputTag) {
                        this.operator = operator;
                        this.numRecordsIn = ((OperatorMetricGroup) 
operator.getMetricGroup()).getIOMetricGroup().getNumRecordsInCounter();
                        this.streamStatusProvider = streamStatusProvider;
    +                   this.outputTag = outputTag;
                }
     
                @Override
    --- End diff --
    
    Again the two `collect()` methods have much identical code. We can put that 
common code in a separate private method and calls this instead of repeating 
the code.


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