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Migrating From Redis to Valkey Serverless
- The article recounts an experience of traffic doubling for the author's Redis nodes exceeding bandwidth allowance and subsequently putting their service down for almost an hour until the source of the issue could be addressed.
- After the incident, the author decided to switch to Elasticache Serverless, which is Valkey Serverless. Valkey is an open-source project that AWS, among others, has been contributing to. It aims to keep Redis compatibility while enhancing overall functionality and performance.
- Valkey is offered in both cluster and serverless variants. The serverless variant is billed by Storage and ECPU (ElastiCache Processing Units) and can become very expensive depending on workload. However, if traffic suddenly changes, the serverless variant can abstract cluster managing and sizing.
- The author reports that the serverless variant of Elasticache Valkey scales seamlessly without observing throttles, when traffic doubles.
- The article suggests that before switching to Elasticache Serverless, careful workload analysis is required, as certain workload characteristics may not be suitable for it.
- The article recommends AWS documentation reads, the use of AWS's pricing calculator, and double-checking security group rules, to ensure smooth integration.
- The article concludes by stating that Elasticache Valkey Serverless should be considered as a possible solution for elastic scaling issues experienced by similar service structures.
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