Github user lonelytrooper commented on the issue:
https://github.com/apache/spark/pull/19274
I guessed that.. This is true, this feature can not ensure the ordering of
data in one Kafka partition, but quite a few applications(like dealing with
logs) do not need strict order guarantee in one Kafka partition. if they want,
just do not use this feature, otherwise, this will achieves good performance
promotion. So I think this feature maybe not so scenario specific. : P
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