freemandealer opened a new pull request, #63504:
URL: https://github.com/apache/doris/pull/63504

   Problem Summary: File cache background consumers used fixed intervals and 
batch sizes for LRU recorder log replay and _need_update_lru_blocks updates. 
When producers outpaced those consumers, backlog growth was hard to observe and 
could increase memory pressure. This change adds queue length metrics for LRU 
recorder log queues, exposes queue-size accessors, supports bounded LRU log 
replay, and makes both background consumers adapt their interval and batch size 
according to backlog watermarks. It also slices block LRU update work into 
smaller lock-hold batches and skips LRU log recording when tail-record 
retention is disabled.
   
   None
   
   - Test: Unit Test
       - `CCACHE_DISABLE=1 DORIS_TOOLCHAIN=clang DISABLE_BE_JAVA_EXTENSIONS=ON 
ENABLE_INJECTION_POINT=ON ENABLE_CACHE_LOCK_DEBUG=0 ENABLE_PCH=0 
EXTRA_CXX_FLAGS='-Wno-error=deprecated-literal-operator' sh run-be-ut.sh --run 
--filter=BlockFileCacheTest.test_lru_log_replay_bound_and_disable_record`
       - `build-support/check-format.sh`
       - `git diff --check`
       - Tried `build-support/run-clang-tidy.sh --base origin/master 
--build-dir be/ut_build_ASAN`; it was blocked by pre-existing/file-level 
diagnostics and system header lookup errors before producing a clean result.
   - Behavior changed: Yes. File cache background queue consumers can increase 
consume frequency and batch size when backlog crosses configured watermarks.
   - 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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