Github user gauravgopi123 commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-core/pull/162#discussion_r44948463
  
    --- Diff: 
engine/src/main/java/com/datatorrent/stram/stream/BufferServerSubscriber.java 
---
    @@ -242,6 +243,21 @@ public long getByteCount(boolean reset)
         }
     
         @Override
    +    public int size(final boolean dataTupleAware)
    +    {
    +      int size = size();
    +      if (dataTupleAware) {
    --- End diff --
    
    @vrozov : It is very critical for certain use cases and it is applied only 
when the  StatsListener on the operator is  annotation with 
StatsListener.DataQueueSize


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