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

    https://github.com/apache/flink/pull/1398#discussion_r45733215
  
    --- Diff: flink-contrib/flink-storm/src/test/java/org/apache/flink/storm/wrappers/WrapperSetupHelperTest.java ---
    @@ -180,8 +178,6 @@ public void testCreateTopologyContext() {
     		builder.setBolt("bolt2", (IRichBolt) operators.get("bolt2"), dops.get("bolt2")).allGrouping("spout2");
     		builder.setBolt("sink", (IRichBolt) operators.get("sink"), dops.get("sink"))
     				.shuffleGrouping("bolt1", TestDummyBolt.groupingStreamId)
    -				.shuffleGrouping("bolt1", TestDummyBolt.shuffleStreamId)
    -				.shuffleGrouping("bolt2", TestDummyBolt.groupingStreamId)
     				.shuffleGrouping("bolt2", TestDummyBolt.shuffleStreamId);
    --- End diff --
    
    We need to fix this... Supporting only 2 inputs is quite weak. Think about a union of many input streams... Join is not the only use case for multiple inputs.


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