Github user ijuma commented on the issue:
https://github.com/apache/spark/pull/21488
Anyway, overall I think you should definitely make this change. Spark users
are currently penalised heavily when running on clusters with the message
format introduced in 0.11.0, which has important resiliency improvements
(KIP-101). And, as @zsxwing said, people can choose an older version if
necessary (I can't think of a reason why, the reason why have focused on making
client jars compatible is so that people can just use the latest independently
of broker versions).
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