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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