waitinfuture opened a new pull request, #2549:
URL: https://github.com/apache/celeborn/pull/2549
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### What changes were proposed in this pull request?
https://github.com/apache/celeborn/pull/2348 avoids fetching first chunk in
the constructor
of `CelebornInputStreamImpl`, but in some cases, i.e. coalescing 3000
partitions into one in Spark,
it can be beneficial to do so for performance. This PR adds back prefetching
with knobs default to false.
### Why are the changes needed?
### Does this PR introduce _any_ user-facing change?
Yes, two configs are added.
### How was this patch tested?
Extended `MemorySkewJoinSuite` and `ReusedExchangeSuite`, and manual test.
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