rich7420 commented on PR #11138:
URL: https://github.com/apache/ozone/pull/11138#issuecomment-5449925206
Quick JMH check of the unused-part scan (`ArrayList.contains` vs `HashSet`,
JDK 21):
```
parts ArrayList HashSet
1000 212 us 2.0 us
10000 26.8 ms 25 us
```
O(n^2) -> O(n) under the bucket write lock. Per-op allocation is unchanged
(both autobox the probed part number), so this is a CPU-time win, not GC.
Negligible for typical small uploads; it matters for large-part completes.
Standalone JMH, not part of the PR.
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