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Pull request overview
This PR fixes a critical bug in the Cosmos DB SDK's location routing logic where unavailable regional endpoints were being dropped from the routing list instead of being appended to the end as fallback options.
Changes:
- Modified the condition in
get_preferred_regional_routing_contextsto always append unavailable endpoints to the routing list (changed fromif not regional_endpoints and unavailable_endpoints:toif unavailable_endpoints:) - Added comprehensive tests to verify that unavailable endpoints are retained in the routing list and properly ordered (healthy endpoints first, unavailable at the end)
- Updated comments to clarify the purpose of keeping unavailable endpoints as last-resort fallback options
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| sdk/cosmos/azure-cosmos/azure/cosmos/_location_cache.py | Fixed the bug by changing the condition to always append unavailable endpoints to the routing list, and updated the comment to explain the rationale |
| sdk/cosmos/azure-cosmos/tests/test_location_cache.py | Added two comprehensive tests: one verifying that unavailable endpoints are not dropped when using excluded_locations, and another verifying proper ordering of healthy vs unavailable endpoints |
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/azp run python - cosmos - tests |
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Azure Pipelines successfully started running 1 pipeline(s). |
simorenoh
approved these changes
Feb 17, 2026
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we currently have a bug in the SDK where unavailable endpoints are dropped from the list instead of being appended to the end.
current (buggy) code:
if not regional_endpoints and unavailable_endpoints:
regional_endpoints.extend(unavailable_endpoints)
only adds unavailable endpoints back if ALL are unavailable.
expected(correct) code:
if unavailable_endpoints:
regional_endpoints.extend(unavailable_endpoints)