Zakelly opened a new pull request, #26248:
URL: https://github.com/apache/flink/pull/26248
## What is the purpose of the change
Currently, the file-based LRU cache lacks of loading files from the
disaggregated DFS. Meaning that after the job recovery, there will be no cache
available, hence the performance is low over a period of time. It is critical
for production availability of disaggregated state.
This PR introduces a new implementation that allows ForSt to manage
file-based cache in a double list (hot/cold) and support cache reload after
eviction.
## Brief change log
- Introduce `DoubleListLru` and rewrite the `FileBasedCache` based on that.
## Verifying this change
This change is already covered by existing IT tests. The new introduced
classes are covered by new introduced UTs.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): yes
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? docs
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