Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19269
> I'm not following what you mean here.
I'm answering the question of @steveloughran about the semantic of data
writers. Ideally transaction means the readers can only see the data after it's
committed, but there is no restriction to let the output of data writers be
visible to other writers, so it's possible to launch a write task just for
cleaning up the data of other writers.
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