deardeng opened a new pull request, #67358:
URL: https://github.com/apache/doris/pull/67358
Problem Summary: Cloud colocate placement scored each bucket independently,
so a 120-bucket group on three backends could be distributed as 47/43/30 and
put the most-loaded backend on the query critical path. Build the complete
placement with deterministic hard quotas so the same case is 40/40/40, while
retaining HRW preference and low remapping when backends change. Route the
dead-backend grace path through the same placement cache with a separate
bounded cache slot for its candidate set.
### Release note
Cloud colocate placement now limits backend bucket counts to differ by at
most one while retaining low-remap HRW behavior.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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