Github user viirya commented on the issue:
https://github.com/apache/spark/pull/11403
@davies I have a question about this. Maybe you have the answer for it?
Thanks.
For a shuffle, although `ShuffleExchange` returns a cached `ShuffledRowRDD`
so `ReusedExchangeExec` can reuse it. In `ShuffledRowRDD`, it still needs to
retrieve remote blocks again, because the previously retrieved remote blocks
are not stored in local. So I am wondering if we explicitly call `cache` on the
`ShuffledRowRDD` which is prepared for reusing, we can skip next round of
remote retrieving. Will it improve the shuffle exchange reuse?
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