deardeng opened a new pull request, #66447:
URL: https://github.com/apache/doris/pull/66447
Related PR: #66378, #66389
Problem Summary: Cloud tablet route rebuilding creates new current and
future global per-backend tablet sets on every `statRouteInfo()` round. Even
when route cardinalities are stable, each `ConcurrentHashMap`-backed set starts
without a sizing hint and repeatedly replaces its backing table while growing.
Use the corresponding previous-generation per-backend tablet count as the
initial-capacity hint for each rebuilt global set. The previous maps already
remain live until the temporary routes are complete, so the hint does not
extend their lifetime. First-round and newly seen backends retain the default
unsized `newKeySet()` behavior. Table- and partition-level indexes, routing
contents, scheduling decisions, and incremental update semantics are unchanged.
A single-threaded JDK 17 multi-scale allocation model representing 4 million
tablets across 4 clusters and both current/future global memberships estimates
cumulative allocation on this path at 1.94 GiB before and 1.62 GiB after the
change, a 16.14% reduction. Approximate post-GC retained heap is unchanged in
the stable-cardinality model; these are path-level estimates, not production
RSS measurements.
### Release note
None
### Check List (For Author)
- Test: Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.cloud.catalog.CloudTabletRebalancerTest` (17 tests passed)
- `mvn checkstyle:check -pl fe-core` (0 violations)
- Single-threaded JDK 17 multi-scale allocation model
- Behavior changed: No
- Does this need documentation: No
### 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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