Victsm opened a new pull request #33613:
URL: https://github.com/apache/spark/pull/33613
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### What changes were proposed in this pull request?
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We have run performance evaluations on the version of push-based shuffle
committed to upstream so far, and have identified a few places for further
improvements:
1. On the client side, in addition to randomizing the order of push
requests, further randomize the order of blocks within a push request before
pushing them. In our benchmark, this has resulted in a 60%-70% reduction of
blocks that fail to be merged due to bock collision (the existing block merge
ratio is already pretty good in general, and this further improves it).
2. On the server side, we have noticed that the usage of `String.format`,
especially when receiving a block push request, has a much higher overhead
compared with string concatenation.
3. On the server side, the usage of `Throwables.getStackTraceAsString` in
the `ErrorHandler.shouldRetryError` and `ErrorHandler.shouldLogError` has
generated quite some overhead. Switch to a direct checking of the exception's
message eliminates this overhead.
### Why are the changes needed?
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Improve shuffle service efficiency and block merge ratio for push-based
shuffle.
### Does this PR introduce _any_ user-facing change?
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the documentation fix.
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No
### How was this patch tested?
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Existing unit tests.
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