Github user zsxwing commented on the issue: https://github.com/apache/spark/pull/18964 > I also notice that Spark RPC by default uses java native serialization, even a verifying endpoint exist or not request would cost 1K of payload size, not to mention some other real logic endpoint, so in the real world it might be useful to profile this @neoremind did you see any performance issue caused by Spark RPC? Spark doesn't send a lot of RPC messages. I don't see it's a bottleneck even when we tried to optimize the latency in Structured Streaming.
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