deardeng opened a new pull request, #66067: URL: https://github.com/apache/doris/pull/66067
pick from https://github.com/apache/doris/pull/64638 In cloud mode, colocate tablet-to-BE placement used modulo hashing ((murmur3(grpId) + idx) % availableBeNum), so scaling a compute group up or down remapped almost all buckets and caused large cold-cache query jitter for colocate tables. Replace it with rendezvous (HRW) hashing behind a new enable_cloud_colocate_consistent_hash (default true): each bucket picks the BE with the highest score(grpId, idx, beId). This keeps the colocate invariant (the same bucket index of all member tables lands on the same BE) while moving only ~1/N buckets when a single BE is added or removed. The legacy modulo path is kept as a rollback branch. Placement is memoized per (group, compute group) in CloudSystemInfoService with a lock-free cache hit and an order-independent fingerprint of the available BE set for invalidation. The cache is local-only (no editlog, no image), and the dead-BE grace window keeps its existing semantics. Add unit tests (movement ratio vs modulo, tie-break, cache invalidation, order independence, modulo rollback) and a cloud docker regression case for colocate join correctness. (cherry picked from commit 355ede4577fa0cc023536eba87b2e0fe427d28aa) ### 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 - [ ] 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: - [ ] No. - [ ] Yes. <!-- Explain the behavior change --> - Does this need documentation? - [ ] 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 --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
