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PYTHON-5662 - Add support for server selection's deprioritized servers to all topologies #2639

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PYTHON-5662 - Add support for server selection's deprioritized servers to all topologies #2639

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@NoahStapp NoahStapp commented Dec 8, 2025 •
edited by caseyclements
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Changes in this PR

Align PyMongo's server selection process with the updated algorithm in DRIVERS-3344. The summary of these changes are:

  • Enable server deprioritization on all topologies instead of only sharded.
  • Filter out deprioritized servers before applying read/write preferences.

Test Plan

Expanded the existing server selection unit tests to include deprioritization tests.

Checklist

Checklist for Author

  • Did you update the changelog (if necessary)?
  • Is there test coverage?
  • Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

  • Does the title of the PR reference a JIRA Ticket?
  • Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
  • Is all relevant documentation (README or docstring) updated?

@NoahStapp NoahStapp requested a review from a team as a code owner December 8, 2025 19:40
@NoahStapp NoahStapp mentioned this pull request Dec 8, 2025
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blink1073
blink1073 previously approved these changes Dec 9, 2025
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LGTM assuming nothing changes in the spec PR

caseyclements
caseyclements previously approved these changes Dec 9, 2025
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LGTM conditional on currently running resync patch.

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@sleepyStick sleepyStick Awaiting requested review from sleepyStick

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@NoahStapp @caseyclements @blink1073