Github user uncleGen commented on the issue:
https://github.com/apache/spark/pull/15992
@jerryshao yep, the simplest way is to turn off it. Generally, this is a
followup patch for #11755. I tends to support
**automatically-pick-best-serializer** feature here to get better performance,
if there is no big damage to existing code, sooner rather than later.
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