Amazon ElastiCache for Valkey now supports durability

Durability Support for Amazon ElastiCache

AWS has introduced durability support for Amazon ElastiCache, enabling the use of ElastiCache for workloads requiring microsecond read latency without tolerating data loss. This feature stores data durably across multiple Availability Zones using a Multi-AZ transactional log for fast failover, database recovery, and node restarts to prevent data loss in case of failure.

Durability Options

• Synchronous Writes: Data persists across at least two AZs before responding to the client, designed for zero data loss with single-digit millisecond write latency.
• Asynchronous Writes: Data persists after responding to the client, maintaining microsecond write latency at no additional cost. However, up to 10 seconds of uncommitted data could be lost in the rare event of a failure.

Both options maintain microsecond read latency, expanding ElastiCache's use cases to include AI agent long-term memory, AI agent workflow state, knowledge bases for RAG applications, payment tokenization, and real-time inventory management.

Availability

Durability for ElastiCache is available in all AWS commercial Regions, AWS China Regions, and AWS GovCloud (US) Regions starting with Valkey 9.0.

What to do

• Create a new ElastiCache cluster.
• Select your preferred durability option using the AWS Management Console, AWS SDK, or AWS CLI.

Source: AWS release notes

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