Overview
The same way RDS is to get managed Relational Databases
ElasticCache is to get managed Redis or Memcached
Caches are in-memory databases with really high performance, low latency
Helps reduce load off of database for read intensive workloads
Helps make your application stateless
AWS take care of OS maintenance / patching, optimizations, setup, configuration, monitoring, failure recovery and backups
Using ElasticCache involves heavy application code changes
ElastiCache Solution Architect - DB Cache
Applications queries ElastiCache, if not available, get from RDS and store in ElastiCache
Helps relieve load in RDS
Cache must have an invalidation strategy to make sure only the most current data is used in there
ElastiCache Solution Architect - User Session Store
User logs into any of the application
The application writes the session data into ElastiCache
The user hit another instance of our application
The instance retrieves the data and the user is already logged in
ElastiCache - Redis vs Memcached
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