Github user deshanxiao commented on the issue:
https://github.com/apache/spark/pull/22093
@xuanyuanking Thanks for your suggestion. We could indeed test whether
`TaskCommitMessage` can be serialized by `KryoSerializer`. But We could not
explain why the framework must serialize `TaskCommitMessage`. So we create our
own `SparkContext`, It could be more convinced to show that it won't work
because of the framework not registering `TaskCommitMessage`.
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