A company has an application that monitors user activity on the company’s website and mobile apps. The application uses Amazon ElastiCache for Redis as a write-through cache and uses an Amazon RDS for PostgreSQL database for longer storage. When the application receives a request to record a user’s action, the application writes to the Redis cluster and the database at the same time. Internal recommendation applications consume the data to produce content recommendations for each user. During peak periods, the recommendation applications cannot generate recommendations for users because of stale and missing data. The Redis cache is configured with cluster mode turned off, and the database is configured with a single read replica. The company wants to ensure that the recommendation applications can generate content recommendations during peak periods. A DevOps engineer already has created a new ElastiCache for Redis cluster with cluster mode enabled. What should the DevOps engineer do next to meet the company’s requirements?

Topic #: - All AWS DevOps Engineer Professional Questions

A. Create a target tracking auto scaling policy for the Redis cluster’s ElastiCachePrimaryEngineCPUUtilization metric. Configure the auto scaling policy to increase and decrease shards to the Redis cluster. Update the recommendation applications to use the clusters configuration endpoint to access Redis.
B. Create a target tracking auto scaling policy for the Redis cluster’s ElastiCachePrimaryEngineCPUUtilization metric. Configure the auto scaling policy to increase and decrease shards to the Redis cluster. Update the recommendation applications to use the cluster’s read replica endpoint to access Redis.
C. Create a scheduled auto scaling policy for the Redis cluster’s ElastiCachePrimaryEngineCPUUtilization metric. Configure the auto scaling policy to add read replicas to the Redis cluster. Update the recommendation applications to use the clusters configuration endpoint to access Redis.
D. Create a scheduled auto scaling policy for the Redis cluster’s ElastiCachePrimaryEngineCPUUtilization metric. Configure the auto scaling policy to add read replicas to the Redis cluster. Update the recommendation applications to use the database’s read replica endpoint instead of Redis.

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