Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 589 discussion

The key points are: ElastiCache Redis provides in-memory caching that can deliver microsecond latency for session data. Redis supports replication and multi-AZ which can provide high availability for the cache. The application can be updated to store session data in ElastiCache Redis rather than locally on the web servers. If a web server fails, the user can be routed via the load balancer to another web server which can retrieve their session data from the highly available ElastiCache Redis cluster.

high availability => use redis instead of Elastich memcache

Option B: Use Amazon ElastiCache for Redis to store the session state. Update the application to use ElastiCache for Redis to store the session state. Explanation: Amazon ElastiCache for Redis is suitable for session state storage because Redis provides both in-memory data storage and persistence options. Redis supports features like replication, persistence, and high availability (through Redis Sentinel or clusters). This ensures that session state is preserved and available even if individual web servers fail.

As Memcached is not HA

A As cache needs to be distributed as ALB is used.

B is correct

Elastic cache is Only for RDS

redis is correct since it provides high availability and data persistance

B is the correct answer. It suggests using Amazon ElastiCache for Redis to store the session state. Update the application to use ElastiCache for Redis to store the session state. This solution is cost-effective and requires minimal development effort.