ElastiCache Redis and Memcached

ElastiCache Redis

ElastiCache can be used to provision managed Redis caches. It also supports Redis in cluster mode.

Points to note:

• ElastiCache Redis caches automatically detect and recover from cache node failures.
• Redis isn’t multithreaded.
• With cluster mode enabled, Redis can partition data in up to 250 shards.
• Authentication to Redis clusters can be controlled using Redis AUTH.
• It supports in-flight encryption using SSL.
• Redis sorted sets allow us to store and order different elements. For example, in a popular exam scenario, we can use Redis sorted sets to maintain a leaderboard without programming this functionality in the application. New elements are ranked and placed in the correct position in real time.
• We can create two cross-region replica clusters for ElastiCache Redis.
• As in RDS, we can enable Multi-AZ functionality. This will automatically replace the primary node in a shard with a read replica in case of

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