Github user lonelytrooper commented on the issue:
https://github.com/apache/spark/pull/19274
Hi Jerry, thank you so much for discussingï¼ Actually, we tried
'repartition' before introducing this feature and for two reasons we give it
up. First, it leads to shuffle which may influence a lot in real time
applications. Second, performance promotion is quite limited in 'repartition'
way. You mentioned the assumption at the front that one Kafka partition map
to one Spark partition, I wonder why this assumption is so vital ?
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