[kafka] Add basic Produce compatibility - #4187
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Introduce request dispatch, ApiVersions, metadata discovery, and topic lifecycle operations as the reviewable foundation for subsequent Produce support. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-5.6-sol AI-Contributed/Feature: 2698/2698 AI-Contributed/UT: 1160/1160
Support raw and string Produce requests, validate acks=all semantics, and wake delayed follower fetches after successful appends. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-5.6-sol AI-Contributed/Feature: 1204/1204 AI-Contributed/UT: 2066/2066
This was referenced Sep 1, 2026
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Purpose
Linked issue: #4185
Depends on #4186.
This is PR 2 of 4 for the Basic Produce compatibility milestone. The intended review delta is the single tip commit
12e1897a8; GitHub shows the PR1 commit as well until #4186 is merged and this branch is rebased onto the updated main branch.Brief change log
acks=all.Tests
ReplicaTest,DelayedActionQueueTest, andDelayedFetchLogTest.API and Format
The change adds internal Kafka Produce compatibility types and reuses existing Fluss log formats. It does not change the Fluss public client API or storage format.
Documentation
No standalone user documentation change in this layer; the umbrella issue describes the staged milestone.
Stack
Generative AI disclosure: Codex (GPT-5.6) assisted with implementation and commit organization. Human review is required before merge.