Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18670
The transport library's failure callback does not do the same thing as the
current code:
respond(new RpcFailure(req.requestId,
Throwables.getStackTraceAsString(e)));
Meaning you don't get a deserialized version of the original exception,
just its stack trace. So it is not the same behavior. Things like checking the
original exception type or its causes will stop working if you do this.
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