Github user ConeyLiu commented on the issue:
https://github.com/apache/spark/pull/18670
Thanks for your reviewing. @vanzin @zsxwing I can understand what you mean.
But if we really need a `Throwable` message in client, such as
[NettyRpcEnv.scala#L205](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rpc/netty/NettyRpcEnv.scala#L205),
why we don't let `org.apache.spark.network.protocol.RpcFailure` hold one
`Throwable` body message instead of a `String` error message. Because we reply
back error message by `RpcResponseCallback.onSuccess`, the `onSuccess` and
`onFailure` can have different behavior.
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