In Amazon ElastiCache replication groups of Redis, for performance tuning reasons, you can change the roles of the cache nodes within the replication group, with the primary and one of the replicas exchanging roles.

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In Amazon ElastiCache for Redis, you can promote a read replica to a primary node, effectively swapping roles with the current primary, to improve performance or for failover purposes.

In Amazon ElastiCache Replication Groups of Redis, for Performance Tuning