nizhikov opened a new pull request #8592:
URL: https://github.com/apache/kafka/pull/8592
Persistent mode for InMemoryKeyValueStore.
If persistent mode is enabled then:
* checkpoint thread started on `KeyValueStore#init`
* every `InMemoryKeyValueStore#COUNT_FLUSH_TO_STORE` flush execution copy
of the `InMemoryKeyValueStore#map` passed to checkpoint thread.
* checkpoint thread persists data every time it sees new instance of
`InMemoryKeyValueStore#map`.
* persisted data are loaded on `KeyValueStore#init`.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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