fix: partition split recursion issue #44649
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
tvaron3
reviewed
Jan 14, 2026
sdk/cosmos/azure-cosmos/azure/cosmos/_execution_context/aio/base_execution_context.py
Show resolved
Hide resolved
tvaron3
reviewed
Jan 14, 2026
sdk/cosmos/azure-cosmos/azure/cosmos/_execution_context/aio/base_execution_context.py
Show resolved
Hide resolved
simorenoh
approved these changes
Jan 14, 2026
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Member
Author
|
/azp run python - cosmos - tests |
|
Azure Pipelines successfully started running 1 pipeline(s). |
simorenoh
reviewed
Jan 15, 2026
…com/Azure/azure-sdk-for-python into users/dibahl/partition-recrsion-fix
tvaron3
approved these changes
Jan 15, 2026
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
When a partition split occurs in Azure Cosmos DB, the SDK was encountering a timeout issue caused by infinite recursion during the 410 (Gone) error retry logic resulting in query timeouts.
TimeoutError after asyncio.exceptions.CancelledError
-> routing_map_provider.py: get_overlapping_ranges
-> routing_map_provider.py: init_collection_routing_map_if_needed
-> base_execution_context.py: _fetch_items_helper_with_retries
-> (recursive loop)
user query fails because the partition it was targeting no longer exists (split into smaller partitions)
SDK tries to recover by refreshing its internal map of partitions
To refresh the map, SDK needs to query Cosmos DB for the new partition list
That query also fails (partition info is also affected by the split)
SDK tries to recover again -> triggers another refresh -> triggers another query -> infinite loop
Two changes were made to fix the issue:
Additional Improvements:
Comprehensive logging added throughout the partition split handling code to enable faster diagnosis of any future issues