freemandealer opened a new pull request, #52811:
URL: https://github.com/apache/doris/pull/52811
When the system restarts, the LRU queue in memory is lost due to lack of
persistence. This requires re-scanning the disk directory to load data, leading
to the following issues:
1. The loading order after restart depends on directory traversal, and the
original eviction order cannot be preserved.
2. If the system enters resource limit mode after restart, it may mistakenly
delete frequently accessed hot data by users.
In this commit, we periodically dump the LRU queue information to disk and
rebuild the LRU queue upon restart. Considering that the LRU content may be
extensive, we only dump the tail end (the part that will be evicted first) of
the LRU queue, with the specific quantity configured by the config.
### 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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