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fix(llmobs): recreate writer on fork [backport 2.11] #10329

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merged 2 commits into from
Aug 22, 2024

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Backport 64b5804 from #10249 to 2.11.

This PR ensures that the LLMObsSpanWriter is correctly recreated and restarted on a forked process.

Previously, on a process fork we were not recreating/restarting the writer worker correctly. This resulted in situations with using celery/gunicorn where LLMObs spans were created, but never submitted as the forked worker process did not have a running writer thread.

Checklist

  • PR author has checked that all the criteria below are met
  • The PR description includes an overview of the change
  • The PR description articulates the motivation for the change
  • The change includes tests OR the PR description describes a testing strategy
  • The PR description notes risks associated with the change, if any
  • Newly-added code is easy to change
  • The change follows the library release note guidelines
  • The change includes or references documentation updates if necessary
  • Backport labels are set (if applicable)

Reviewer Checklist

  • Reviewer has checked that all the criteria below are met
  • Title is accurate
  • All changes are related to the pull request's stated goal
  • Avoids breaking API changes
  • Testing strategy adequately addresses listed risks
  • Newly-added code is easy to change
  • Release note makes sense to a user of the library
  • If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
  • Backport labels are set in a manner that is consistent with the release branch maintenance policy

This PR ensures that the LLMObsSpanWriter is correctly recreated and
restarted on a forked process.

Previously, on a process fork we were not recreating/restarting the
writer worker correctly. This resulted in situations with using
celery/gunicorn where LLMObs spans were created, but never submitted as
the forked worker process did not have a running writer thread.

## Checklist
- [x] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

---------

Co-authored-by: Sam Brenner <106700075+sabrenner@users.noreply.github.com>
(cherry picked from commit 64b5804)
@github-actions github-actions bot requested review from a team as code owners August 22, 2024 14:02
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datadog-dd-trace-py-rkomorn bot commented Aug 22, 2024

Datadog Report

Branch report: backport-10249-to-2.11
Commit report: 0689e2e
Test service: dd-trace-py

✅ 0 Failed, 834 Passed, 40179 Skipped, 15m 17.26s Total Time

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pr-commenter bot commented Aug 22, 2024

Benchmarks

Benchmark execution time: 2024-08-22 14:37:16

Comparing candidate commit 2b31282 in PR branch backport-10249-to-2.11 with baseline commit fab0306 in branch 2.11.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 214 metrics, 2 unstable metrics.

@sabrenner sabrenner enabled auto-merge (squash) August 22, 2024 19:01
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CODEOWNERS have been resolved as:

releasenotes/notes/fix-llmobs-forked-writer-257b993bcf131af8.yaml       @DataDog/apm-python
ddtrace/llmobs/__init__.py                                              @DataDog/ml-observability
ddtrace/llmobs/_llmobs.py                                               @DataDog/ml-observability
ddtrace/llmobs/_writer.py                                               @DataDog/ml-observability
tests/llmobs/test_llmobs_service.py                                     @DataDog/ml-observability

@sabrenner sabrenner merged commit bc2b2af into 2.11 Aug 22, 2024
112 of 116 checks passed
@sabrenner sabrenner deleted the backport-10249-to-2.11 branch August 22, 2024 21:01
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