deardeng opened a new pull request, #66451:
URL: https://github.com/apache/doris/pull/66451
Related PR: #66378, #66389
Problem Summary: Cloud tablet route rebuilding retains the current and
future table-level and partition-level scheduling indexes for the entire sleep
interval after each balancing round, although later status checks and external
readers only need the global indexes. At 4 million tablets across 4 clusters, a
single-threaded JDK 17 path-level model estimates that releasing these four
nested graphs reduces approximate post-full-GC retained route-index heap from
4.66 GiB to 1.35 GiB, a 3.31 GiB or 70.96% reduction. Cumulative route-index
construction allocation remains 7.36 GiB, so this change reduces between-round
retention rather than allocation volume or in-round peak memory. Replace the
four top-level maps in a finally block after balancing so all exit paths
release the old graphs without an O(N) clear traversal, while preserving
current and future global routes. The next route-statistics pass rebuilds the
scheduling indexes before they are used again. These numbers are model esti
mates, 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 (16 tests passed)
- mvn checkstyle:check -pl fe-core (0 violations)
- 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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