[kafka] Add SASL/PLAIN authentication - #4188
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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
Authenticate Kafka protocol connections with SASL/PLAIN and propagate the authenticated principal through request dispatch and authorization. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-5.6-sol AI-Contributed/Feature: 1503/1503 AI-Contributed/UT: 1514/1514
This was referenced Sep 1, 2026
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Purpose
Linked issue: #4185
Depends on #4187.
This is PR 3 of 4 for the Basic Produce compatibility milestone. The intended review delta is the single tip commit
263282d0d; the earlier stack commits remain visible until their PRs are merged and this branch is rebased.Brief change log
Tests
API and Format
The change adds internal Kafka authentication plumbing and configuration. It does not change the Fluss public API or storage format.
Documentation
No standalone documentation change in this layer.
Stack
Generative AI disclosure: Codex (GPT-5.6) assisted with implementation and commit organization. Human review is required before merge.