pipeline: outputs: s3: document schema-directed Arrow and Parquet output by cosmo0920 · Pull Request #2766 · fluent/fluent-bit-docs

cosmo0920 · 2026-10-08T06:25:15Z

The corresponding PR is fluent/fluent-bit#12529.

Summary by CodeRabbit

Documentation
- Clarified that newline-delimited JSON is the default S3 record format and documented Arrow and Parquet support requirements, compression limits, and log_key restrictions, including initialization failure when used with either format.
- Added guidance for schema-directed Arrow and Parquet output, including schema requirements, supported types, record conversion, validation, and failure cases.
- Documented schema-specific buffer locations, retry and quarantine handling, configuration examples, and integration-test dependencies.

coderabbitai · 2026-10-08T06:25:32Z

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📝 Walkthrough

Walkthrough

The S3 output documentation identifies newline-delimited JSON as the default format. It describes Arrow and Parquet options, schema-directed conversion, schema-specific buffering, and integration-test requirements.

Changes

S3 schema-directed output

Layer / File(s)	Summary
Format and schema conversion `pipeline/outputs/s3.md`	Documents Arrow and Parquet options and the `parquet.schema_file` parameter. Describes schema requirements, conversion rules, and failure conditions.
Buffering and integration-test guidance `pipeline/outputs/s3.md`	Describes schema-specific buffer directories, resume requirements, conversion failure handling, and integration-test requirements.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to d3ccc

The documentation now hyphenates the default format and states the Arrow compression and Arrow/Parquet log_key restrictions. It also explains the schema-change buffer limitation; no specific documentation issue currently warrants blocking merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: documenting schema-directed Arrow and Parquet output for the S3 pipeline.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 2

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Inline comments:
Review comments at @pipeline/outputs/s3.md:
- Line 19: Update the S3 output description to hyphenate “newline-delimited”
when modifying “JSON,” preserving the rest of the sentence.
- Line 54: Update the `format` entry to document that Arrow accepts only unset
or `zstd` compression and that `log_key` is unsupported with Parquet; retain the
existing format and OTLP JSON behavior descriptions.

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🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @pipeline/outputs/s3.md:
- Line 52: Update the `log_key` documentation for the S3 output to state that it
is unsupported with both Arrow and Parquet, matching the initialization
restriction.

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- Note log_key is unsupported with format arrow and format parquet. - Also note it's unsupported with the deprecated compression arrow and compression parquet. - Update the format row to say Arrow or Parquet. - Replace "nullable" with plain-language description - Replace "NUL" with "null" in embedded bytes sentence Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io> Signed-off-by: Eric D. Schabell <eric@schabell.org>

eschabell

@cosmo0920 fixed a few issues to get it to pass ci review, thanks for the docs PR, just waiting on code PR merging.

cosmo0920 requested review from a team, eschabell and patrick-stephens as code owners October 8, 2026 06:25

cosmo0920 mentioned this pull request Oct 8, 2026

out_s3: make an optional arrow schema option fluent/fluent-bit#12529

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cosmo0920 force-pushed the cosmo0920-add-doc-for-optional-json-schema-on-out_s3 branch from 3c4f9d2 to 9b7209c Compare October 8, 2026 06:44

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eschabell self-assigned this Oct 8, 2026

eschabell added waiting-on-code-merge waiting-on-review Waiting on a review from mainteners labels Oct 8, 2026

eschabell force-pushed the cosmo0920-add-doc-for-optional-json-schema-on-out_s3 branch from 9b7209c to d3cccae Compare October 8, 2026 19:27

eschabell removed the waiting-on-review Waiting on a review from mainteners label Oct 8, 2026

eschabell force-pushed the cosmo0920-add-doc-for-optional-json-schema-on-out_s3 branch from d3cccae to 748dd88 Compare October 8, 2026 19:36

eschabell approved these changes Oct 8, 2026

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pipeline: outputs: s3: document schema-directed Arrow and Parquet output - #2766

pipeline: outputs: s3: document schema-directed Arrow and Parquet output#2766
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