Introduction to Amazon

ElastiCache for Redis

Omer Zaki, Sr. Product Manager, AWS

Pravin Muthukumar, Business Development Manager, AWS

Dimensions for categorizing data stores

• Persistence – In Memory vs Strongly Durable

• Data Model – Key Value vs Document Model vs Relational

• Scalability – None vs Scale up vs Scale out

Redis is a popular key-value store

• High speed, in-memory, key-value data store

• Optional durability (persistence via snapshot or

append only file)

• Supports pub/sub functionality

Redis is a popular key-value store

• Supports advanced data structures (in addition

to strings) – Lists of strings

– Sets of strings (collection of non-repeating unsorted elements)

– Sorted Sets (collections of non-repeating elements ordered by

a floating-point number called score)

– Hashes where keys and values are strings

Elastic Load

Balancing EC2 App

Instances

MySQL DB

Instance

ElastiCache

for Redis

Database Writes

App

Reads

Clients

Cache

Updates

Use Redis to accelerate your application

Database Reads

Introducing ElastiCache for Redis

• Managed Redis service

• Use existing clients

• Pay as you go

• Available in all public AWS regions at launch

Benefits of a managed service

Easy to Deploy

Deploy master-slave(s)

configuration with a few button clicks or

API calls

Easy to Migrate

Compatible with Redis

Existing code will work when you

update node end points

Easy to Administer

ElastiCache automatically

replaces failed nodes and patches software as needed

CloudWatch enables you to monitor cache performance

metrics

Easy to Secure

Supports VPC and Security Group configurations

Key features

• All Redis commands supported except slave

and backup commands

• Redis version 2.6.13

• Ability to create Redis nodes inside VPC

environment

• Support for Lua scripting

• Support for pub/sub e.g. Resque

Key features

• Managed Redis experience – Console, API, and CLI options to create and manage Redis nodes

– Monitoring and node replacement

– CloudWatch metrics

– Support several instance types at launch: t1.micro, m1.small, m1.medium, m1.large, m1.XL, m2.XL, m2.2XL, m2.4XL, C1.XL

• Replication – Master-slave(s) configuration

• High Availability – Multi-AZ support

– Assisted failover: Console and API options to select best slave node for promotion to master during failover event

• Backup and DR – Ability to connect external slave to master for backup and DR

– Ability to seed an ElastiCache for Redis master node from external snapshot

Where is ElastiCache Redis used?

• Gaming

• Social

• Media & Entertainment

• Mobile

• Ad Tech

• Many more…

• Auto-scaling front end

• Amazon ElastiCache

• Amazon RDS

• Amazon S3

• Amazon CloudFront

Sample deployment: Gaming

ZADD leaderboard 556 “Andy” ZADD leaderboard 819 “Barry” ZADD leaderboard 105 “Carl” ZADD leaderboard 1312 “Derek”

ZREVRANGE leaderboard 0 -1 1) “Derek” 2) “Barry” 3) “Andy” 4) “Carl”

Design Patterns

• Cache

• Leaderboards

• High Speed Sorting

• Atomic Counters

• Queuing Systems

• Activity Streams

Some things to watch out for with Redis

• Whole dataset must fit in memory

• Soft Persistence

• Single Threaded

• Some datatypes cannot scale out

• No Transactions

Setup Instructions: Master Node

Setup Instructions: Master Node

Setup Instructions: Master Node

Setup Instructions: Master Node

Setup Instructions: Replication Group

Setup Instructions: Replication Group

Setup instructions: Read Replica

Setup instructions: Read Replica

Promoting a Read Replica to Master Node

Promoting a Read Replica to Master Node

Free tier: 750 hours of Micro Cache Node per

Month

Pay as little as $0.022 per hour thereafter

for a T1.micro node

You can get started for free

Amazon

ElastiCache for

Redis

Quick Review:

• Managed Redis service

• Support for Replication

• Easy migration

• Rich Use Cases

For More Information:

• ElastiCache for Redis Detail Page and Docs:

http://aws.amazon.com/documentation/elasticache/

• Getting Started:

http://docs.aws.amazon.com/AmazonElastiCache/latest/U

serGuide/GettingStarted.html

Any Questions?