[Launched] Generally Available: Azure Cosmos DB for MongoDB (vCore) same-region replica cluster

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Azure has officially launched the Generally Available feature of same-region replica clusters for Azure Cosmos DB for MongoDB (vCore), enhancing high availability and disaster recovery capabilities within the same Azure region. This capability allows continuous data streaming between a primary cluster and one or more read-only replica clusters in the same region, providing improved read scalability and resilience without needing a multi-region setup.

Key points about this launch include:

  • Same-region replica clusters enable disaster recovery and read scalability by maintaining real-time data replication within a single Azure region.

  • These replica clusters store full copies of the MongoDB data—databases, collections, and documents—and provide a separate endpoint for read operations. They can be promoted to handle write operations in case the primary cluster becomes unavailable.

  • The feature complements existing cross-region replication, which duplicates data across geographically separated regions for disaster recovery. Same-region replicas provide a more localized, lower-latency solution for high availability and read scalability.

  • Setting up a same-region replica involves enabling replication in the Azure portal under the cluster's global distribution settings, naming the replica, and specifying it in the same region as the primary cluster.

  • Limitations and conditions include:

  • High availability (HA) employs standby shards that run alongside primary shards.

  • Replica clusters do not support HA features.

  • Burstable compute and free-tier clusters do not support replica clusters.

  • Cross-region replication supports only clusters with a single shard, but same-region replication can support multiple shards.

  • The architecture ensures data durability using locally redundant storage (LRS) with triple synchronous replication and data integrity verification inside a single Azure region.

  • This update follows Azure Cosmos DB for MongoDB (vCore)’s overall mission to provide a fully managed, scalable, and MongoDB-compatible database service with deep Azure integration and added features like built-in vector database support for AI workloads, all under a unified management and support experience.

The official Azure update (dated around mid-2025) describes this as a major step to enable developers to build robust, highly available MongoDB applications on Azure with lower latency replica read options and improved disaster recovery within the same Azure region[2][3][5][9].

In summary, the GA of same-region replica clusters for Azure Cosmos DB for MongoDB (vCore) delivers localized replication for enhanced performance, reliability, and operational simplicity, complementing the earlier cross-region replication capabilities and making Cosmos DB a more versatile MongoDB cloud platform.

อ้างอิงค์ : https://azure.microsoft.com/updates?id=501975

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