Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/9021#issuecomment-146582988
  
    LGTM. 
    
    @vanzin I think maybe we should monitor dual connections. I also found an 
issue about the message order. If we run the following code in order,
    ```
    ref.send("A")
    ref.send("B")
    ```
    the receiver side may see "B" before "A". It's because we use a thread pool 
to call `sendRpc`. While you fix the  transport library, is it possible to make 
`clientFactory.createClient` non-blocking so that we don't need the thread pool?



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