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Review of the various cache options available in the Microsoft Azure platform.
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More Cache for Less Cash
Michael S. Collier@MichaelCollier
DevLink 2014 – August 27, 2014
Today’s Agenda
• Why Cache?• Cache Options in Azure• Demos• Monitoring and Scaling• Pricing and Features
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Why Cache?
Load on server increases with users
Add a load balancer and more web instances
Continue to scale out the web and business logic tiers
DB load starts to increase, becomes the bottleneck
Azure Load Balancer
Web Tier
Business Tier
Data Tier
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Why Cache?
Improve application performance
Reduce load on DB
Azure Load Balancer
Web Tier
Business Tier
Data Tier
Cache Cache Tier
What is Azure Cache Service?
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A distributed, in-memory, flexible cache for all data types that can be used to speed up Azure applications and reduce database load.Basically, cache helps your
app become faster.
Windows Azure Cache
A Cache Story
Shared Cache
• Cloud Services
• Shared – quotas
• Lacked feature parity
• Multiple size options
• Expensive• Performance challenged• Throttling
• Deprecated August 2014
In-Role Cache
• Cloud Services
• Co-located (free)
• Dedicated ($$)
• Feature parity
• Good performance
• Not multi-tenant
Cache Service
• Cloud Services, Web Sites, or VMs
• Feature parity
• Managed infrastructure
• Price/capacity tiers
• Good performance (1ms read)
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A Cache Story
Shared Cache
• Cloud Services
• Shared – quotas
• Lacked feature parity
• Multiple size options
• Expensive• Performance challenged• Throttling
• Deprecated August 2014
In-Role Cache
• Cloud Services
• Co-located (free)
• Dedicated ($$)
• Feature parity
• Good performance
• Not multi-tenant
Cache Service
• Cloud Services, Web Sites, or VMs
• Feature parity
• Managed infrastructure
• Price/capacity tiers
• Good performance (1ms read)
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A Cache Story
Shared Cache
• Cloud Services
• Shared – quotas
• Lacked feature parity
• Multiple size options
• Expensive• Performance challenged• Throttling
• Deprecated August 2014
In-Role Cache
• Cloud Services
• Co-located (free)
• Dedicated ($$)
• Feature parity
• Good performance
• Not multi-tenant
Cache Service
• Cloud Services, Web Sites, or VMs
• Feature parity
• Managed infrastructure
• Price/capacity tiers
• Good performance (1ms read)
9
A Cache Story
Shared Cache
• Cloud Services
• Shared – quotas
• Lacked feature parity
• Multiple size options
• Expensive• Performance
challenged• Throttling
• Deprecated August 2014
In-Role Cache
• Cloud Services
• Co-located (free)
• Dedicated ($$)
• Feature parity
• Good performance
• Not multi-tenant
Cache Service
• Cloud Services, Web Sites, or VMs
• Feature parity
• Managed infrastructure
• Price/capacity tiers
• Good performance (1ms read)
Redis Cache
• TBD
• TBD
• TBD
• TBD
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http://aka.ms/MigrateFromSharedCaching
In-Role Cache (Co-located)
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Web Roles
300MB 300MB 300MB 300MB
1.2GB Distributed Cache
Source: Windows Azure Training Kit
In-Role Cache (Dedicated)
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24GB Distributed Cache
Web Roles
12GB CacheWorker Role
12GB CacheWorker Role
2Source: Windows Azure Training Kit
In-Role Cache (Dedicated)
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24GB Distributed Cache
Web Roles
12GB CacheWorker Role
12GB CacheWorker Role
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12GB CacheWorker Role
12GB CacheWorker Role
48GB Distributed Cache
Source: Windows Azure Training Kit
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In-Role Cache
• Based on the AppFabric Cache engine• Released w/ Oct. 2012 release of Azure SDK 1.8• Cache part of your Cloud Service application• No quotas or throttling• Isolation, flexibility, and control• High performance
• Features: named cache, regions, tagging, HA, local, notifications
• Pro: You manage as part of your application• Con: You manage it; only available to Cloud Service roles
in same deployment
Create and Configure In-Role Cache
Configure a Role in the Cloud Service to host the cache
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Configure the Cache Clients
• Use NuGet to configure the cache clients• Microsoft.WindowsAzure.Caching• Settings placed in web.config or app.config• Modify to point to the cache server role
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<dataCacheClients> <dataCacheClient name="default"> <!--To use the in-role flavor of Windows Azure Cache, set identifier to be the cache cluster role name --> <!--To use the Windows Azure Cache Service, set identifier to be the endpoint of the cache cluster --> <autoDiscover isEnabled="true" identifier="MyScores.Web" /> <!--<localCache isEnabled="true" sync="TimeoutBased" objectCount="100000" ttlValue="300" />--> </dataCacheClient></dataCacheClients>
Role Name
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DEMO TIME!!!
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Recap
1. Select “Enable Caching” in Azure role configuration
2. Install NuGet package (Microsoft.WindowsAzure.Caching)
3. Set role name in web.config4. Get/Set data
Monitoring the Cache
Diagnostic Level
Data Collected
0 Critical/catastrophic server logs only
1 Data to help in assessing usage patterns, cache health, and potential errors. Default.
2 Fine grain data for all requests and important system information
3 Diagnostic data with more verboseness and system information
4 Highest verbosity logs for all requests and system information
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Provides a single setting for cache servers and clientsConfigures levels for logs, traces, performance counters & crash dumps
Full details at http://aka.ms/CacheDiagnostics
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Monitoring the Cache
• Set cache diagnostic level in configuration or portal
• Level (1-4) controls verbosity, perf counters, & crash dumps.
• Start at 1 and increase as needed<Role name="WorkerRole1"> <Instances count="1" /> <ConfigurationSettings> <!– Cache Server --> <Setting name="Microsoft.WindowsAzure.Plugins.Caching.DiagnosticLevel“ value="1" />
<!– Cache Client--> <Setting name="Microsoft.WindowsAzure.Plugins.Caching.ClientDiagnosticLevel" value="1" /> </ConfigurationSettings></Role> Full details at http://mcollier.net/AzureCacheDiag
Monitoring the Cache
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public class WebRole : RoleEntryPoint{ public override bool OnStart() {
// Enable cache diagnostics DiagnosticMonitorConfiguration dmConfig = DiagnosticMonitor.GetDefaultInitialConfiguration();
// Configure collection of cache diagnostic data. CacheDiagnostics.ConfigureDiagnostics(dmConfig);
DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString", dmConfig);
return base.OnStart(); }}
Considerations
• Unable to create DataCache in RoleEntryPoint
• Max object size is 8MB post serialized
• Default serializer is NetDataContractSerializer
• Cost only for role instances
• Only accessible from within same Cloud Service• Deployment will impact the cache (instances recycle)
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What’s the Azure Managed Cache Service?
Shared Azure Website Stamp
App2
App1 VM VM
VM
IaaS VMs
Cloud Services
Azure Managed Cache Service
1. SLA backed2. Microsoft Managed3. Scalable &
Resilient
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Create and Configure the Cache Service
• Based on AppFabric Cache engine
• Create via PowerShell only • Manage in Azure management portal
• Choose an offering• Basic (128MB to 1GB in 128MB units, 1 named cache)• Standard (1GB to 10GB in 1GB units, notifications, and 10 named
caches)• Premium (5GB to 150GB in 5GB units, notifications, HA, and 10
named caches)
• Locate in same region as client for best perf and cost
Create and Configure the Cache Service
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PS C:\> New-AzureManagedCache -Name devlinkcache ` -Location "East US" `
-Sku Basic ` -Memory 128MB
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DEMO TIME!!!
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Recap
1. Create Managed Cache via PowerShell2. Install NuGet package
(Microsoft.WindowsAzure.Caching)3. Set cache service endpoint & key in
web.config4. Get/Set data
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Monitoring the Cache
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Scaling the Cache
Dynamically scale without loosing any existing data
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High Availability
Client Primary
Secondary
Read / Write
Write
Premium only
Doubles required memory
Increased latency & decreased throughput
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Pricing Details
Basic Standard Premium
Price Per Unit(Preview)
$25/month(prorated hourly)
$100/month(prorated hourly)
$400/month(prorated hourly)
Cache Size 128 MB 1 GB 5 GB
Scale Up to 8 units Up to 10 units Up to 30 units
Named Caches 1 10 10
High Availability Notifications
See http://mcollier.net/AzureCachePricing
Benefits of the Azure Managed Cache Service• Use from any app types (VM, Web Site, Mobile Service, Cloud
Service)• Each instance deployed within dedicated VMs (fast, predictable
performance)• No quotas or throttling• Store up to 150GB per cache instance• Avg. retrieval time of 1ms. Insert in about 1.2ms• Highly available / distributed across multiple servers• Managed service – focus on apps not infrastructure• Same .NET cache API used with in-role cache for Cloud
Services• Support for ASP.NET Session State and Page Output Caching• Unique cache service instance for each app, or share across
apps32
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Azure Redis Cache (Preview)
• Secure, dedicated Redis cache• Hosting and monitoring by Microsoft
• 250MB – 26GB (Preview)
• Tiers• Basic – single node; dev/test and non-critical
workloads• Standard – provides master/slave replication
Azure Redis Cache (Preview)
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Monitoring and Alerts
• Set metrics and timeframe to monitor
• Pin to dashboard
• Alert when threshold reached
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DEMO TIME!!!
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Recap
1. Create Redis Cache via portal2. Add Redis C# client (e.g.
StackExchange.Redis)3. Obtain Redis endpoint and password from
portal4. Determine formatter for .NET objects5. Get/Set data
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Common Architecture
Web Roles
Storage Table
Windows Azure Cache
3. W
rite
1. R
ead
2. Read
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Common Architecture
Windows Azure Load Balancer
Web Roles Worker Roles
SQL Database (Azure)
Azure Cache
Read
Read
Writ
e
Preload the cache
Carefully choose expiration and eviction settings
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Common Architecture
Azure Load Balancer Web Roles Storage Queue Worker Roles
Storage Table SQL Database (Azure)
Azure Cache
Write Read
Wri
te
Read
Write
Wri
te
Cloud Service Fundamentals - Caching
• Factory implementation• Custom BinarySerializer
class• protobuf-net• Fast and small
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http://mcollier.net/AzureCSF
What Cache?
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• Azure Shared Cache – out of service on September 1, 2014
New Development
Need GA and SLA
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Where to Cache?
Mix cache solutions for price / manageability / features
Azure Load Balancer Web Roles
Azure Cache
Read
• Data shared by other services/apps
• General application data
In-role cache
• Session / Page Output Cache
• FREE!
Summary
• In-Role Cache• Cloud Services only• Co-located (free) or Dedicated ($$$)• Isolated cache-related workload
• Cache Service• Microsoft managed service, dedicated tenant, SLA backed• Cloud Services, Web Sites, and VMs• Full parity with in-role cache (SDK)
• Redis Cache• Microsoft managed Redis Cache• Master/Slave replication in Standard tier• Normal Redis features/functionality
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More Resources
• Azure Cache Options Overview• http://msdn.microsoft.com/en-us/library/azure/gg278356.aspx
• Which Azure Cache Offering is right for me?• http://msdn.microsoft.com/en-us/library/azure/dn766201.aspx
• Cloud Service Fundamentals – Caching Basics• http://azure.microsoft.com/blog/2013/10/03/cloud-service-fundamentals-caching-basics/
• Capacity Planning Spreadsheet (In-Role Cache)• http://msdn.microsoft.com/en-us/library/hh914129
• Lap around Azure Redis Cache• http://azure.microsoft.com/blog/2014/06/04/lap-around-azure-redis-cache-preview/
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Q &
A
Ask your questions
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