deardeng opened a new pull request, #68783:
URL: https://github.com/apache/doris/pull/68783
### What problem does this PR solve?
Issue Number: None
Related PR: #67636
Problem Summary: CloudReplica image deserialization created independent
String cluster IDs and boxed Long backend IDs for equivalent routes. The tested
production image contains 4,197,906 replicas and 62,708,955 routes but only 15
cluster IDs and about 85 backend IDs, so millions of equal route identifiers
retained duplicate heap objects. Canonical sharing reduced forced-GC live heap
from 15,311,045,744 bytes to 8,539,550,968 bytes, saving 6,771,494,776 bytes
(6.31 GiB, 44.2%).
Intern cluster IDs and primary backend IDs on route updates and after image
deserialization so equal routes reuse the same objects. Use Guava weak
interners instead of strong process-lifetime maps: active routes keep canonical
objects alive, while identifiers become collectable after their last route is
removed. Routing behavior and the serialized image format are unchanged.
The full 6.93 GB image completed compatibility load and dump with the final
weak-interner implementation. A clean run loaded in 225.679 seconds and dumped
in 145.935 seconds. JFR attributed 255 of 18,139 load-stage CPU samples (1.41%)
to the interner path, with no sampled allocations attributed directly to it.
### Release note
Reduce FE heap usage for CloudReplica routing metadata and release unused
historical route identifiers.
### Check List (For Author)
- Test: Unit Test / Manual test
- CloudReplicaTest: 23 tests passed
- ./build.sh --fe passed with Checkstyle 0 violations
- Full production image compatibility load and dump passed
- JFR profile verified the interner path is not a load hotspot
- Behavior changed: Yes; equal in-memory route identifiers are shared and
unused canonical identifiers can be reclaimed, without changing routing results
or image serialization
- 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
- [ ] 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 -->
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