out_kafka: add record-derived Kafka message headers - #12287
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Signed-off-by: kimonus <kimonus@users.noreply.github.com>
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (3)
🚧 Files skipped from review as they are similar to previous changes (3)
📝 WalkthroughWalkthroughThe Kafka output extracts a configured record map into Kafka message headers. It supports string, binary, and null values, validates protocol limits, optionally preserves the source map, and rejects unsupported OTLP formats. Tests cover formats, retries, invalid inputs, and Kafka record batches. ChangesDynamic Kafka headers
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to The PR adds optional record-derived Kafka headers while preserving existing behavior when unconfigured, and no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant FluentBitRecord
participant OutKafka
participant librdkafka
participant KafkaTestServer
FluentBitRecord->>OutKafka: provide record with headers_key map
OutKafka->>librdkafka: build Kafka headers
OutKafka->>librdkafka: producev payload and headers
librdkafka->>KafkaTestServer: send Kafka record
KafkaTestServer-->>OutKafka: return version-aware produce response
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Test evidenceExample configurationpipeline:
inputs:
- name: dummy
tag: example.logs
dummy: '{"message":"example","kafka_headers":{"trace-id":"abc-123","content-type":"application/json"}}'
outputs:
- name: kafka
match: example.logs
brokers: 192.0.2.10:9092
topics: example-logs
format: json
headers_key: kafka_headers
preserve_headers_key: falseFunctional integrationFLUENT_BIT_BINARY=/tmp/fluent-bit \
tests/integration/.venv/bin/python -m pytest \
tests/integration/scenarios/out_kafka/tests/test_out_kafka_001.py \
-q -k dynamic_headersThe complete current The focused cases validate Kafka magic-v2 wire output, exact header bytes, Strict ValgrindVALGRIND=1 VALGRIND_STRICT=1 FLUENT_BIT_BINARY=/tmp/fluent-bit \
tests/integration/.venv/bin/python -m pytest \
tests/integration/scenarios/out_kafka/tests/test_out_kafka_001.py \
-q -k dynamic_headersThe strict integration harness completed successfully with no Valgrind memory Runtime and broker smoke tests
A Redpanda v24.3.11 smoke test confirmed that the broker received the expected The build used these options and completed all source and test targets: |
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Actionable comments posted: 2
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Inline comments:
In `@plugins/out_kafka/kafka.c`:
- Around line 1814-1830: Reindent the new initializer entries in
plugins/out_kafka/kafka.c lines 1814-1830 using four-space indentation for
braces and members, and reindent each TEST_LIST entry in
tests/runtime/out_kafka.c lines 117-121 using four spaces.
In `@tests/integration/scenarios/out_kafka/tests/test_out_kafka_001.py`:
- Around line 903-910: In both affected blocks of
tests/integration/scenarios/out_kafka/tests/test_out_kafka_001.py (anchor lines
903-910 and sibling lines 1025-1032), store the non-string-name result from
_wait_for_log_text in a separate variable and assert it alongside the
value-warning result; update
test_out_kafka_dynamic_headers_all_invalid_map_is_removed at the sibling site
the same way.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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Configuration used: defaults
Review profile: CHILL
Plan: Pro Plus
Run ID: fac28c1f-7827-40fd-954b-6ad78dbbc430
📒 Files selected for processing (25)
plugins/out_kafka/kafka.cplugins/out_kafka/kafka_config.cplugins/out_kafka/kafka_config.htests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_avro.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_batch.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_blank.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_blank_otlp_json.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_empty.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_forward.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_gelf.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_missing.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_msgpack.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_non_map.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_otlp_json_invalid.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_otlp_proto_invalid.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_preserve.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_preserve_empty.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_preserve_msgpack.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_queue_full.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_raw.yamltests/integration/scenarios/out_kafka/config/out_kafka_dynamic_headers_too_large.yamltests/integration/scenarios/out_kafka/tests/test_out_kafka_001.pytests/integration/src/server/kafka_server.pytests/runtime/out_kafka.c
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
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The initial CentOS 7 compile check exposed a test-registration mismatch: Commit Verification:
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Signed-off-by: kimonus <kimonus@users.noreply.github.com>
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
Signed-off-by: kimonus <kimonus@users.noreply.github.com>
cosmo0920
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cosmo0920
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On my side, it looks good.
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@cosmo0920 Could you please rerun the failed Ubuntu unit-test job? The only leaf failure was I have not changed or retriggered the branch because there is no evidence that the Kafka patch caused this S3 runtime-test failure. |
2 participants
Summary
Add record-derived Kafka message headers to the
out_kafkaplugin.headers_keyselects a top-level MessagePack map in each log record. Supported entries are transferred to librdkafka as Kafka message headers. The selected map is omitted from the serialized value by default;preserve_headers_key trueretains it.The implementation preserves string, binary, empty, and null values, map order, and duplicate header names. Invalid entries are skipped with warnings. Missing and non-map source fields don't cause payload data loss.
The change uses librdkafka's existing header APIs and
rd_kafka_producev(). It keeps header ownership correct across successful enqueue, enqueue failure, and the existing queue-full retry loop. No bundled code underlib/is modified.Closes #12286.
This complements #8583: its repeated
headeroption configures known headers individually, whileheaders_keyconverts a variable map already present in each record.Related prior requests #1673, #8334, and #9448 are closed as stale. Draft PR #9057 is another older implementation of individually configured headers and doesn't provide this record-map interface.
Compatibility
avro,gelf,json,msgpack, andraw.otlp_jsonandotlp_proto; a nonblankheaders_keyis rejected during initialization.headers_keyvalues disable the feature.headers_keyisn't configured.Before and after
Given this generic record:
{ "message": "example", "kafka_headers": { "trace-id": "abc-123", "content-type": "application/json" } }and this output configuration:
before this change,
kafka_headerscan only remain in the serialized value. After this change, its entries are Kafka message headers and the JSON value is{"@timestamp":...,"message":"example"}. Setpreserve_headers_key: trueto keep the original map in the value as well.Testing
Build configuration:
Focused runtime result:
Focused integration command:
Result:
Strict Valgrind command:
Result:
Complete component integration result:
Additional checks:
Packaging is not affected, so the packaging-specific checklist is not applicable.
Documentation
Documentation PR:
fluent/fluent-bit-docs#2672Backporting
No backport is requested. This feature targets
masterfor the next major release.Fluent Bit is licensed under Apache 2.0. By submitting this pull request, I understand that this code will be released under the terms of that license.
Summary by CodeRabbit
New Features
Bug Fixes
Tests