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

    https://github.com/apache/flink/pull/3501#discussion_r105406325
  
    --- Diff: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java
 ---
    @@ -906,6 +919,256 @@ public void testChannelSelectors() {
        }
     
        /////////////////////////////////////////////////////////////
    +   // KeyBy testing
    +   /////////////////////////////////////////////////////////////
    +
    +   @Rule
    +   public ExpectedException expectedException = ExpectedException.none();
    --- End diff --
    
    Well it may be more concise, but a try catch block makes it way more 
obvious that this part of the code throws an exception we care about.
    
    try-catch blocks are also more commonin the codebase, and I'm wondering 
whether we want to introduce an inconsistency there.


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