branch-4.0: [improvement](filecache) limit file cache LRU replay queues(pick#64381)#64462
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morningman merged 2 commits intoJun 24, 2026
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freemandealer
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Fixed branch-4.0 compile compatibility for the previous BE/BE UT failure by removing the master-only run buildall |
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### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: File cache LRU log replay needs tighter default replay latency, bounded in-memory queues, and observability for pending block LRU updates and LRU log replay. This change lowers the replay interval default to 1 ms, adds hard caps for the pending block update queue and per-type LRU log queues, preserves existing LRU log backlog when tail recording is disabled, and exposes queue length plus monotonic produce/consume/idle counters. QPS bvars are not added because Prometheus can derive rates from the counters. Tests that depended on background replay timing now use a deterministic single-replay helper with a high background interval.
### Release note
Add bounded file cache LRU recorder queues and replay/update queue count metrics.
### Check List (For Author)
- Test: Manual test
- `PATH=/mnt/disk1/zhangzhengyu/build-dep/ldb_toolchain.back/bin:$PATH build-support/clang-format.sh`
- `PATH=/mnt/disk1/zhangzhengyu/build-dep/ldb_toolchain.back/bin:$PATH build-support/check-format.sh`
- Focused BE UT rerun was started but stopped during compilation at reviewer request; no completed BE UT result after the latest metric cleanup.
- Behavior changed: Yes. File cache LRU replay defaults to 1 ms, LRU log and block update queues are capped at 500000 by default, and disabling tail record enqueueing no longer clears existing replay backlog.
- Does this need documentation: No
(cherry picked from commit de23f15)
Picked-from: apache#64381
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morningman
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Jun 24, 2026
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PR approved by at least one committer and no changes requested. |
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Pick from #64381