deardeng opened a new pull request, #66378:
URL: https://github.com/apache/doris/pull/66378
Problem Summary: Cloud tablet route-cache rebuilding calls fillBeToTablets
for current and future placements. The previous putIfAbsent calls eagerly
constructed up to six candidate maps and sets for every placement even when the
keys already existed, and then performed separate lookups. Use the containers
returned by computeIfAbsent at every level and add a focused unit test that
verifies all six container paths while preserving the global, table, and
partition index contents.
An isomorphic multi-scale JVM allocation model with 2 million entities,
four-route fan-out, current/future passes, and three index scopes estimated
cumulative allocation per modeled rebuild at 12.52 GiB before and 8.59 GiB
after the change, saving 3.93 GiB (31.4%). For 4 million tablets, the fill-path
cumulative-allocation reduction is expected to remain about 31% under
comparable topology, while the absolute GiB saving depends on cluster and
replica fan-out. The retained graph remained about 3.76 GiB and the peak proxy
about 966 MiB, so this change does not claim a comparable steady-state heap or
process-wide reduction. Timing samples were noisy, so no throughput improvement
is claimed.
### Release note
None
### Check List (For Author)
- Test: Unit Test / Manual benchmark
- ./run-fe-ut.sh --run
org.apache.doris.cloud.catalog.CloudTabletRebalancerTest#testFillBeToTabletsUsesComputedContainers
- cd fe && mvn checkstyle:check -pl fe-core
- Multi-scale isomorphic JVM allocation model: 12.52 GiB to 8.59 GiB
cumulative allocation per modeled rebuild
- 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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