erenavsarogullari commented on a change in pull request #3109: Add withStream() 
in Streamlet to support stream selection
URL: https://github.com/apache/incubator-heron/pull/3109#discussion_r233567670
 
 

 ##########
 File path: heron/api/src/java/org/apache/heron/streamlet/Streamlet.java
 ##########
 @@ -71,6 +71,22 @@
    */
   int getNumPartitions();
 
+  /**
+   * Set the id of the stream to be used by the children nodes.
+   * Usage (assuming source is a Streamlet object with two output streams: 
stream1 and stream2):
+   *   source.withStream("stream1").filter(...).log();
+   *   source.withStream("stream2").filter(...).log();
+   * @param streamId The specified stream id
+   * @return Returns back the Streamlet with changed stream id
+   */
+  Streamlet<R> withStream(String streamId);
+
+  /**
+   * Gets the stream id of this Streamlet.
+   * @return the stream id of this Streamlet
+   */
+  String getStreamId();
 
 Review comment:
   Also IT coverage will be useful to verify end2end so will be addressing in 
the light of #3106

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