[Cosmos] Add Region Routing and Cross-Region Retry design doc#48714
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jeet1995 wants to merge 1 commit intoAzure:mainfrom
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[Cosmos] Add Region Routing and Cross-Region Retry design doc#48714jeet1995 wants to merge 1 commit intoAzure:mainfrom
jeet1995 wants to merge 1 commit intoAzure:mainfrom
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Documents how the Java SDK routes requests to specific regions via LocationCache, how preferredRegions and excludedRegions affect routing, and under what conditions ClientRetryPolicy retries cross-region — potentially bypassing configured region preferences. Covers: - LocationCache.resolveServiceEndpoint() region resolution logic - getPreferredAvailableRoutingContexts() endpoint list construction - Regional endpoint fallback behavior (single-write vs multi-write) - Exhaustive usePreferredLocations trace in ClientRetryPolicy - ChangeFeedProcessor region routing - Cross-SDK comparison with Python SDK Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Description
Adds a design document (sdk/cosmos/azure-cosmos/docs/RegionRouting.md) that describes how the Java SDK routes requests to specific regions, how preferredRegions and excludedRegions affect routing, and under what conditions ClientRetryPolicy retries cross-region - potentially bypassing configured region preferences.
Motivation
Created during a CFP region routing investigation. The investigation uncovered nuanced behavior in LocationCache and ClientRetryPolicy that was not documented anywhere.
Contents
Validated against