[PR] Implement LLM-driven review assigner for PR bot [beam]

Wed, 02 Sep 2026 11:16:03 -0700 


kennknowles opened a new pull request, #39980:
URL: https://github.com/apache/beam/pull/39980

   Beam's existing PR reviewer assigner works like so:
   
    - matches directory paths against coarse labels (e.g. java, python, kafka)
    - and assigns one reviewer per matching label via round-robin
   
   The downsides:
   
    - Reviewer bloat on multi-directory PRs
    - Doesn't stay up to date
    - Is pretty coarse
   
   This PR is meant to introduce a little more intelligence:
   
    - Read the history and do some heuristics on who has edited in a meaningful 
way recently
    - Provide that heuristic along with the history to an LLM to choose a good 
reviewer
    - Give the reviewer a one-liner about why they were chosen
   
   ------------------------
   
   Thank you for your contribution! Follow this checklist to help us 
incorporate your contribution quickly and easily:
   
    - [x] Mention the appropriate issue in your description (for example: 
`addresses #123`), if applicable. This will automatically add a link to the 
pull request in the issue. If you would like the issue to automatically close 
on merging the pull request, comment `fixes #<ISSUE NUMBER>` instead.
    - [x] Update `CHANGES.md` with noteworthy changes.
    - [x] If this contribution is large, please file an Apache [Individual 
Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
   
   See the [Contributor Guide](https://beam.apache.org/contribute) for more 
tips on [how to make review process 
smoother](https://github.com/apache/beam/blob/master/CONTRIBUTING.md#make-the-reviewers-job-easier).
   
   To check the build health, please visit 
[https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md](https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md)
   
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   See [CI.md](https://github.com/apache/beam/blob/master/CI.md) for more 
information about GitHub Actions CI or the [workflows 
README](https://github.com/apache/beam/blob/master/.github/workflows/README.md) 
to see a list of phrases to trigger workflows.
   


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