Amazon ElastiCache

Amazon Cloud Concepts Learning --> Day22

Amazon ElastiCache

• Setting up, maintaining, and growing distributed in-memory cache systems in the AWS Cloud is made simple with Amazon ElastiCache.

• The in-memory cache it offers is highly efficient, scalable, and reasonably priced. Additionally, it eliminates the difficulties involved in setting up and maintaining a distributed cache system.

• A fully managed in-memory caching solution, ElastiCache is designed to handle real-time use cases requiring high throughput and ultrafast speed.

• Best for scenarios where the DB load is based on Online Analytics Processing (OLAP) transactions.

• ElastiCache is commonly utilized as a cache to improve database or application speed.

• Used as primary data store for applications like session stores, streaming, gaming leaderboards, and API rate limitation, which do not require durability.

• The goal of ElastiCache is to reduce the additional complexity of administering your inmemory caching systems for Redis and Memcached engines.

• Scales your reads/writes based on changing business needs.

• ElastiCache engines come in two different varieties:

1. Memcached

• An intuitive, high-performance in-memory data store.

• Offers a mature, scalable, open-source solution for delivering sub-millisecond response times, which makes it useful as a cache or a non-durable session store.

• Capable of running big nodes with several cores and threads and able to cache items like databases.

2. Redis

• Redis Stands for Remote Dictionary Server is an open-source, quick data structure storage.

• Used as a distributed in-memory data store used as a database, cache, streaming engine, and message broke.

• Offers backup/restore, automated failover, cross-AZ (HA), encryption, and master/slave replication.

Amazon ElastiCache Features

1. Fully Managed

• Automates common administrative tasks required to operate a distributed in-memory key-value environment.

• You can quickly add a caching or in memory layer to your application design.

• Automatically finds and replaces failing nodes in a cluster.

2. Workload Scalability

• To accommodate write traffic, ElastiCache for Redis also allows the cluster to autoscale by changing the number of shards.

• It can also increase or decrease the number of read replicas to handle read traffic.

• Pre-defined cloud-watch metrics are continuously checked and trigger the autoscaling procedure as needed.

• Horizontal and vertical scaling capabilities exits.

3. Extreme Performance

• ElastiCache improves the performance of applications by helping you retrieve information from a fast, managed, in-memory system, instead of relying entirely on slower disk-based databases.

4. Secure and Reliable

• ElastiCache is a highly secure service with features such as network isolation, TLS, encryption at rest or in transit, multi-AZ, and automatic failover.

Amazon ElastiCache Use Cases

• Web Session Store - In cases with load-balanced web servers, store web session information in Redis so if a server is lost, the session info is not lost, and another web server can pick it up.

• Database Caching - Use Memcached in front of AWS RDS to cache popular queries to offload work from RDS and return results faster to users

• Leaderboards - Use Redis to provide a live leaderboard for millions of users of your mobile app

Comparison between Memcached & Redis

Some common feature comparison between two engines

Additional Resources

https://aws.amazon.com/elasticache/faqs/

https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/WhatIs.html

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Note: All Images are from AWS Official Document

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