Learning AWS - DVA - Day 12: ElastiCache

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

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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

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ElastiCache - Redis vs Memcached