Github user HeartSaVioR commented on the issue:
https://github.com/apache/spark/pull/21445
@LiangchangZ
> In the real CP situation, reader and writer may be always in different
tasks, right?
Continuous mode already supports some valid use cases, and putting all in
one task would be fastest in such use cases though tasks can be parallelized by
partition. Unless we have valid reason to separate reader and writer even in
non-shuffle query, it would be better to keep it as it is.
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