Best practices: Pub/Sub - Amazon ElastiCache for Redis
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Best practices: Pub/Sub

When using ElastiCache for Redis to support Pub/Sub workloads with high throughput requirements, we recommend that you use Cluster Mode Disabled configuration. On Cluster Mode Enabled clusters, published messages are broadcast to all other nodes over a cluster bus. The buffer management in the cluster bus could result in high EngineCPUUtilization when loaded with Pub/Sub traffic. For more information, see Clusterbus buffer management can consume significant memory and CPU utilization during pubsub. This condition does not occur in Cluster Mode Disabled clusters, where the published messages are sent over the replication link that uses a different buffer management approach.