eolivelli opened a new pull request, #3604:
URL: https://github.com/apache/celeborn/pull/3604
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### What changes were proposed in this pull request?
- Create only one S3 client for all MultiPartUploaders
- Create S3 worker directory only once and not for every slot
### Why are the changes needed?
- Because on S3 AWS creating connections is slow (due to credentials
handshaking and TLS handshaking)
- Because "mkdirs" in S3 AWS is very slow (and it needs several S3 calls)
### Does this PR resolve a correctness bug?
No
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Manual testing.
There is one end-to-end integration test with S3 that exercise this code
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