Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/11499#issuecomment-191996138
> Does this situation arise when there aren't multiple threads accessing
one stream? I had thought the docs were prohibiting this so that the defensive
copy wasn't needed
This is not related to multiple threads accessing one stream. The caller of
`sendRpcSync` is usually in some user thread and `onSuccess` is called in
netty's thread pool. They are not in the same thread.
However, the doc is pretty confusing. I think it wants to say that if using
different clients to send messages, the responses may be out-of-order.
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