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How it works

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How it works - Amazon MemoryDB

Here's how MemoryDB Multi-Region works.

  • Concepts

    A Multi-Region cluster is a collection of one or more regional clusters, all owned by a single AWS account.

    A regional cluster is a single cluster in a AWSRegion that is a part of a Multi-Region cluster. Each regional cluster stores the same set of data. Any given Multi-Region cluster can only have one regional cluster per AWS Region.

    When you create a Multi-Region cluster, it consists of multiple regional clusters (one per Region) that MemoryDB treats as a single unit. When an application writes data to any regional cluster, MemoryDB automatically and asynchronously replicates that data to all other regional clusters within the Multi-Region cluster. You can add regional clusters to the Multi-Region cluster so that it can be available in additional Regions. You will be able to automatically replicate MemoryDB cluster data between up to five Regions.

  • Availability and durability

    In the unlikely event of regional isolation or degradation of a Region, you can update your global DNS to redirect traffic to your application to one of the other healthy Regions without any database reconfiguration, simplifying the process of maintaining high availability for your applications. MemoryDB durably stores all writes from all Regions in the multi-AZ transactional log to ensure no data loss within the Region. MemoryDB Multi-Region keeps track of all writes that have been acknowledged in the Regionbut have not yet been replicated to all member clusters. In case a Region is isolated or degraded, it will still continue to accept local writes. When the isolated Region is connected to the Multi-Region cluster again, writes that have been acknowledged but not yet replicated to other Regions will be replicated to all Regions in the Multi-Region cluster. MemoryDB Multi-Region will also automatically reconcile the pending writes with any updates that may have occurred in other Regions during the outage using a CRDT mechanism.

  • Connecting to MemoryDB Multi-Region clusters

    To write data to and read data from your regional cluster, you connect to it using one of the supported Redis OSS/Valkey clients (including Valkey GLIDE). Each regional cluster has an endpoint that your Redis OSS/Valkey client can connect to. You can retrieve your regional cluster endpoints using the AWS console, CLI or API. You can then use (or configure) this endpoint in your application to read/write data from regional clusters.

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