Chief Technical Evangelist – Cloud

blog.

www.brianHprince.com

twitter.

@brianHprince

email.

Brian.Prince@microsoft.com

• Author of “Azure in Action”

• Deep cloud and architecture background

• Experience leading agile software teams

“I love gaming, both Xbox and table top

games. I just crossed 70,000 achievement

points.”

Agenda

• Why use Cache

• Redis

• Azure Offering

Typical Caching Patterns

Web Tier

Data

Storage

SQL

Data

Typical Caching Patterns

Web Tier

Cache

Data

Data

Storage

SQL

- High Throughput

- Low Consistent Latency

50% : <3ms

99% : <10ms

Azure

Region

REDIS

“Redis has many different use cases. The simplest way to describe it

is something between a traditional database and doing

computations in memory. Redis exposes data structures that are

accessed in memory via a set of commands. ” – Salvatore

“ Redis is an open source, BSD licensed, advanced key-value store. It is often

referred to as a data structure server since keys can contain strings, hashes,

lists, sets and sorted sets. ” - redis.io

What is Redis?

Rich Redis Ecosystem

• Proven at scale

• Twitter, Github, Weibo, Pinterest, Snapchat, Craigstlist, StackOverflow, Flickr …

• Knowledgeable community

• Rich set of clients, higher level libraries

• Easy to hire for

Core Redis Features

• Low latency, high throughput key-value store

Per Key expiry, choice of eviction policies

• Atomic operations on data types

Strings, hashes, lists, sets, sorted sets

• Publisher-Subscriber pattern

• LUA scripting

• Transactions

• Pipelining

• Client libraries in multiple languages

Redis Admin Features

• Highly customizable replication support

• Supports hierarchy of ‘Slaves’ per ‘Master ’

• Persistence support *

• Point in time, Log every write, or both

• Clustering *

REDIS CACHE

- CLI

- VS

- AZURE

Demo

AZURE REDIS CACHE

PaaS Service

Azure Redis Cache

• Redis Cache hosted and managed by Microsoft

• Dedicated virtual machine per cache

• Sizes: 256 MB, 1 GB, 2.8 GB, 6 GB, 13 GB, 26 GB, 53 GB

• Available in all Azure Regions

• Except China and Government cloud

• Basic SKU : Single cache node

• Standard SKU: Cache node + one replica

• Availability SLA of 99.9%

• SSL support

Azure Redis Cache…

• Monitoring/ Diagnostics

• Alerts

• ASP.NET Session & Output Cache Providers

HIGH AVAILABILITY

Standard SKU only

High Availability

Availability Set

Master Slave

High Availability

Availability Set

Master Slave

High Availability

Availability Set

Master Slave

High Availability

Availability Set

Master Slave

SCALING AZURE REDIS CACHE

Azure Redis Cache Latency

50% : <3ms

99% : <10ms

• Pings sent via RedisBenchmark.exe

• Client and Cache in same region

• Lightly loaded Cache

Scaling Azure Redis Cache

– Increased Cache Size (Memory)

– Increased Bandwidth

– Single CPU

– Increased Cache Size, Bandwidth, CPU

– Improved Availability

– Client responsible for sharding (Static/Dynamic)

– Sharding on Server (Clustering) in future roadmap

Azure Redis Cache Performance

Cache Size

(GB)

Bandwidth

(Mbps)

GET/sec

(1KB values)

Cores

(Redis)

0.25 5 600 0.25*

1 100 12k 1*

2.8 200 24k 1

6 400 48k 1

13 500 60k 1

26 1000 110k 1

53 1000+ 150k 1

LOOKING AHEAD

• Open public endpoint

• China/Government Cloud support

• Geo Replication [One Master, Read-only geo replicas]

• Persistance

• Clustering

• Scaling

Resources

http://azure.microsoft.com/en-us/services/cache/

http://blogs.msdn.com/b/webdev/archive/2014/05/12/announcing-asp-net-session-state-

provider-for-redis-preview-release.aspx

CACHE PATTERNS

Basic Patterns – Cache over SQL

Web Tier

Data

SQL

Data

Basic Patterns – Cache over SQL

Web Tier

Cache

Data

Data

SQL

- High Throughput

- Consistent Low Latency

Azure

Region

Basic Patterns – Cache over Storage

Web Tier

Cache Dynamic

Data

Dynamic

Data

Storage

Static

Data

Basic Patterns – Multi-Region Scenario

Web Tier

Cache

Storage Azure Region 1

Web Tier

Cache

Azure Region 2

Cache

Sync

Basic Patterns – Multi-Region Scenario

Web Tier

Cache

Azure Region 1

Web Tier

Cache

Azure Region 2

SQL SQL

Secondary Index

Wilber Finely 0001:0032

0001:0032

234 1st St.:20.0:

http://aka.ms/WAD267

Session Evaluation