Understand Why Primary Nodes Have More Keys than a Replica
This discrepancy can occur after adding a read replica to an ElastiCache Redis (cluster mode disabled) cluster that contains a large number of keys with TTL (time-to-live) values that have expired. In this scenario, if you add a new read replica to an existing Redis (cluster mode disabled) cluster, the read replica issues a ‘sync’ command to obtain an RDB file snapshot of the primary node’s contents. When the read replica loads this RDB file into memory, it discards any keys that have expired.
This behavior is by design because Redis keys are expired both actively and passively as described at How Redis expires keys.
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