WIP: KAFKA-12549 Prototype for transactional state stores

[Gerrrr]

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KIP-844 Transactional state stores

Summary of testing strategy (including rationale) for the feature or bug fix. Unit and/or integration tests are expected for any behaviour change and system tests should be considered for larger changes.

Committer Checklist (excluded from commit message)

• [ ] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [ ] Verify documentation (including upgrade notes)

[guozhangwang]

Hello @Gerrrr , just checking with you is this PR ready for reviews now?

Also, I'm thinking if we can break it up into smaller PRs (e.g. one with public API + configs, one with integration tests, etc) so that we can merge them quicker: past experience shows that big PRs would turn longer time to merge compare with break-up smaller ones aggregated, hence I'm thinking if we can take any ways to make the KIP adopted quicker.

[Gerrrr]

Hey @guozhangwang !

Yeah, I am still working on the PR - adding integration tests, running benchmarks, etc. I will ping you here and update the description once the PR is ready for review. We can decide on the best way to split it then.

[mjsax]

Closing this PR as stale. KIP-844 was discarded in favor of KIP-892.