[kafka] Transcode mapped raw and string records to Arrow - #4285
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Introduce API registration, request context, version validation, and asynchronous error mapping. Fix request buffer ownership and response serialization cleanup while preserving the existing ApiVersions entry point. Validated with mvn -o -pl fluss-rpc,fluss-kafka verify. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 555/555 AI-Contributed/UT: 525/525
Route requests through the dispatcher and advertise only implemented APIs. Return version-aware errors for unsupported APIs and invalid requests. Validated with mvn -o -pl fluss-kafka verify (23 unit tests and 1 IT). Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 313/313 AI-Contributed/UT: 137/137
Add Metadata v0-v11 handling over pre-created Fluss tables, with listener-aware gateway access, table/topic mapping, partition metadata, and error handling. Do not implement CreateTopics, DeleteTopics, or automatic table creation. Honor authoritative ISR values when bucket epochs are present. For legacy metadata without an epoch, conservatively report only an available leader. Verified fluss-kafka: 37 unit tests and 1 integration test, with Spotless and Checkstyle passing. Rebuilt the matching RPC dependency from the same base. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 909/909 AI-Contributed/UT: 540/540
Extract topic identity and the raw/string table mapping contract before Metadata. Validate table kinds, field projections and metadata columns independently of request handling and record decoding. Validation: Java 11, mvn -o -pl fluss-kafka clean verify (47 unit tests and 2 integration tests); Checkstyle, Spotless and RAT passed. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 769/769 AI-Contributed/UT: 480/480
Integrate the DDL mapping prerequisite and use its resolver for Metadata discovery. Omit unsupported tables from all-topic queries and return per-topic mapping errors for named queries. Preserve metadata for compatible tables in mixed requests. Validation: Java 11, mvn -o -pl fluss-kafka clean verify (62 unit tests and 2 integration tests); Checkstyle, Spotless and RAT passed. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 742/742 AI-Contributed/UT: 571/571
Validate non-idempotent Produce v3-v11 and isolate invalid partitions before invoking a protocol-independent backend. Preserve partition order, acknowledgements and owned record data. Leave production registration to the append integration PR. Validation: Java 11, mvn -o -pl fluss-kafka spotless:apply clean verify; 69 unit tests and 2 integration tests passed, including Checkstyle, Spotless and RAT. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 621/621 AI-Contributed/UT: 366/366
Reuse the DDL contract to assemble key, value, timestamp and ordered headers into physical rows. Decode strings with strict UTF-8 validation and preserve nullable values. Return owned heap log bytes and recycle Arrow writers on success and failure. Validation: Java 11, mvn -o -pl fluss-kafka spotless:apply clean verify; 75 unit tests and 2 integration tests passed, including Checkstyle, Spotless and RAT. Co-Authored-By: Codex <noreply@openai.com> AI-Model: gpt-6 AI-Contributed/Feature: 314/314 AI-Contributed/UT: 326/326
This was referenced Sep 10, 2026
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Purpose
Closes #4282. Part of #4185.
Use the DDL mapping contract to decode raw/string keys and values, assemble physical rows with optional timestamps and ordered headers, and encode owned native Arrow log bytes.
This is PR06, depending on #4284 (PR05).
Brief change log
Incremental scope: 6 files, +640 / -0 (314 implementation and 326 test lines). The implementation contract and its failure-path tests are kept together as one review unit; the line count includes Javadoc and license headers.
Tests
Java 11 at
503136295d6bbaed81b7e7845dceb2d64db2d9d4:mvn -o -pl fluss-kafka spotless:apply clean verify: 75 unit tests and 2 integration tests passed.git diff --checkpassed.The full repository test suite and Flink SQL runtime were not run.
API and Format
Adds raw/string-to-Arrow conversion for the existing DDL contract, with no wire or storage format change. JSON decoding and append integration remain separate.
Stack and review
Draft while prerequisites are unmerged. The PR targets Apache
main, so the full Files changed view includes prerequisites. Use this incremental comparison to review this stage alone.Generative AI disclosure: Codex assisted with extraction, implementation, tests and commit organization. Human review is required before merge.