seojangho commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 
pipelining
URL: https://github.com/apache/incubator-nemo/pull/2#discussion_r172762043
 
 

 ##########
 File path: 
common/src/main/java/edu/snu/nemo/common/ir/vertex/transform/Transform.java
 ##########
 @@ -32,16 +30,15 @@
   /**
    * Prepare the transform.
    * @param context of the transform.
-   * @param outputCollector that collects outputs.
+   * @param pipe that collects outputs.
    */
-  void prepare(Context context, OutputCollector<O> outputCollector);
+  void prepare(Context context, Pipe<O> pipe);
 
   /**
    * On data received.
-   * @param elements data received.
-   * @param srcVertexId sender of the data.
+   * @param element data received.
    */
-  void onData(Iterator<I> elements, String srcVertexId);
+  void onData(Object element);
 
 Review comment:
   We declared input type as `<I>`.
   ```java
   void onData(I element);
   ```

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