Github user ConeyLiu commented on the issue:
https://github.com/apache/spark/pull/18670
Ok, thanks for the answer. I think we can use `ByteBuffer` to solve the
wire compatibility problem, maybe I'm wrong.
I think we should change this, because we also using `onFaliure` to send
failure message, as follow:
```scala
respond(new RpcFailure(req.requestId, Throwables.getStackTraceAsString(e)));
```
or
```scala
(e) => callback.onFailure(e)
```
Then the client will receive a error messages wraped in `RuntimeException`.
If all these do not need to change, I can close it.
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