For single node Redis clusters, ElastiCache dynamically spins up a duplicate, replicates the data, after which fails over to it. For replication groups consisting of a number of nodes, ElastiCache replaces the prevailing replicas and syncs information from the primary to the new replicas. If Multi-AZ with autofailover is enabled, replacing the primary triggers a failover to a read duplicate. For Redis Cluster configurations which might be arrange to make use of Redis Cluster clients, and non-Cluster configurations with auto failover enabled, the planned node replacements full whereas the cluster serves incoming write requests. If Multi-AZ is disabled, ElastiCache replaces the first and then syncs the information from a read duplicate. The main node is unavailable during this time, resulting in longer write interruption.
These updates are obligatory and applied immediately in your maintenance home windows with none motion needed out of your aspect. These updates are separate than these … Read More