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Velocity - Edge UG

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Phil Pursglove
Phil Pursglove

This document discusses Microsoft's AppFabric distributed caching technology. It provides an overview of AppFabric, why distributed caching is useful, how to configure AppFabric clients and servers, and how to manage data in an AppFabric cache, including concurrency and high availability. While version 1 has some limitations, it is suitable as a session state provider, and the author expects version 2 to improve the product.

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The Need For Speed A Developer’s Guide to Distributed Caching with Velocity AppFabric Phil Pursglove phil@philippursglove.com http://philpursglove.blogspot.com http://www.philippursglove.com/Velocity http://twitter.com/philpursglove http://slideshare.net/philpursglove
Agenda • What is AppFabric? • Why a Distributed Cache? • Configuring a client • Configuring a server • Managing a cache • Concurrency • High availability / load balancing
Caching Review • .NET 1.1 – ASP.NET Cache • .NET 2.0 – SqlCacheDependency – Enterprise Library Caching Application Block • .NET 4.0 – System.Runtime.Caching assembly – AppFabric
Cache-Aside • The cache-aside pattern – See if the item you want is in the cache – If it isn’t (a cache miss), • Go and get it i.e. from the DB • Put it in the cache – If it is, • Cast it to the desired type and return it
What is AppFabric? • A combination of two projects: – A distributed cache • One logical cache shared across a number of physical servers • Already being used by: – MSDN Forums – Xbox Live – MSN • A session state provider • In .NET 4.0, a cache provider – A workflow host • Beta 2 released 1st March 2010 – Servers must be .NET 4.0, clients can be .NET 3.5/4.0
Why a Distributed Cache? • Bigger cache – Many physical servers contribute to one logical cache • High availability – Multiple servers = fault tolerance • Increased throughput – Many servers available to fulfil requests
Terminology • Cluster – A number of servers running Velocity – Not related to Windows clustering • Cache – A named cache on a cluster • Region – A named part of a cache associated to a single server
What Data Can I Cache In AppFabric? • Any serializable .NET object – Reference Data (Shared Read) • e.g. Product categories – Activity Data (Exclusive Write) • e.g. Shopping Basket – Resource Data (Read and Write) • e.g. product stock data
Configuring the AppFabric Client • Two assembly references to add: – Microsoft.ApplicationServer.Caching.Client.dll – Microsoft.ApplicationServer.Caching.Core.dll • Cache hosts can be hard-coded or in web.config/app.config • Clients – Routing vs Simple – Local caches
Using AppFabric • Add/Remove • Concurrency – Optimistic – Pessimistic • Regions – Live inside a cache – Tie a group of cached objects to a specific node  – But adds extra options (Tags) for retrieving the object 
Configuring an AppFabric Server • Cluster configuration can be held: – On a network share (XML Provider) – In a SQL Server DB (SQL Provider) • Integrated Security only  – AppFabric servers must be inside a domain
Managing An AppFabric Cluster • Powershell integration – Can start/stop a whole cluster or individual servers – Create new named caches • But not regions  – Get cache statistics • MDCAdmin tool – WPF app sitting on top of Powershell
Summary • Velocity is going to be great … in v2  • v1 is worth looking at as a session state provider – The end of sticky load-balancing 
Questions? phil@philippursglove.com http://philpursglove.blogspot.com http://www.philippursglove.com/Velocity http://twitter.com/philpursglove http://slideshare.net/philpursglove
References • Documentation on MSDN – http://tinyurl.com/msdnappfabric • Velocity team blog – http://blogs.msdn.com/velocity • AppFabric blog for IT Pros – http://blogs.technet.com/appfabric/ • TechEd videos – http://tinyurl.com/velocityteched • Mix 09 video – http://tinyurl.com/velocitymixvideo • Mix 10 video – http://tinyurl.com/velocitymix10video • ARCCast Video – http://tinyurl.com/velocityscotthavideo • ScottHa on Velocity – http://tinyurl.com/velocityhanselminutes
References • AppFabric coverage on StackOverflow – http://tinyurl.com/stackoverflowvelocity – http://tinyurl.com/stackoverflowappfabric • DotNetRocks – http://tinyurl.com/dotnetrocksappfabric • Other .NET distributed caches – NCache - http://tinyurl.com/ncache – Memcached - http://tinyurl.com/smoe – Oracle Coherence – http://tinyurl.com/oraclecoherence – SharedCache – http://codeplex.com/sharedcache • Extensions Project – http://tinyurl.com/mscacheext • Admin Tool – http://mdcadmintool.codeplex.com/

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Velocity - Edge UG

  • 1. The Need For Speed A Developer’s Guide to Distributed Caching with Velocity AppFabric Phil Pursglove phil@philippursglove.com http://philpursglove.blogspot.com http://www.philippursglove.com/Velocity http://twitter.com/philpursglove http://slideshare.net/philpursglove
  • 2. Agenda • What is AppFabric? • Why a Distributed Cache? • Configuring a client • Configuring a server • Managing a cache • Concurrency • High availability / load balancing
  • 3. Caching Review • .NET 1.1 – ASP.NET Cache • .NET 2.0 – SqlCacheDependency – Enterprise Library Caching Application Block • .NET 4.0 – System.Runtime.Caching assembly – AppFabric
  • 4. Cache-Aside • The cache-aside pattern – See if the item you want is in the cache – If it isn’t (a cache miss), • Go and get it i.e. from the DB • Put it in the cache – If it is, • Cast it to the desired type and return it
  • 5. What is AppFabric? • A combination of two projects: – A distributed cache • One logical cache shared across a number of physical servers • Already being used by: – MSDN Forums – Xbox Live – MSN • A session state provider • In .NET 4.0, a cache provider – A workflow host • Beta 2 released 1st March 2010 – Servers must be .NET 4.0, clients can be .NET 3.5/4.0
  • 6. Why a Distributed Cache? • Bigger cache – Many physical servers contribute to one logical cache • High availability – Multiple servers = fault tolerance • Increased throughput – Many servers available to fulfil requests
  • 7. Terminology • Cluster – A number of servers running Velocity – Not related to Windows clustering • Cache – A named cache on a cluster • Region – A named part of a cache associated to a single server
  • 8. What Data Can I Cache In AppFabric? • Any serializable .NET object – Reference Data (Shared Read) • e.g. Product categories – Activity Data (Exclusive Write) • e.g. Shopping Basket – Resource Data (Read and Write) • e.g. product stock data
  • 9. Configuring the AppFabric Client • Two assembly references to add: – Microsoft.ApplicationServer.Caching.Client.dll – Microsoft.ApplicationServer.Caching.Core.dll • Cache hosts can be hard-coded or in web.config/app.config • Clients – Routing vs Simple – Local caches
  • 10. Using AppFabric • Add/Remove • Concurrency – Optimistic – Pessimistic • Regions – Live inside a cache – Tie a group of cached objects to a specific node  – But adds extra options (Tags) for retrieving the object 
  • 11. Configuring an AppFabric Server • Cluster configuration can be held: – On a network share (XML Provider) – In a SQL Server DB (SQL Provider) • Integrated Security only  – AppFabric servers must be inside a domain
  • 12. Managing An AppFabric Cluster • Powershell integration – Can start/stop a whole cluster or individual servers – Create new named caches • But not regions  – Get cache statistics • MDCAdmin tool – WPF app sitting on top of Powershell
  • 13. Summary • Velocity is going to be great … in v2  • v1 is worth looking at as a session state provider – The end of sticky load-balancing 
  • 15. References • Documentation on MSDN – http://tinyurl.com/msdnappfabric • Velocity team blog – http://blogs.msdn.com/velocity • AppFabric blog for IT Pros – http://blogs.technet.com/appfabric/ • TechEd videos – http://tinyurl.com/velocityteched • Mix 09 video – http://tinyurl.com/velocitymixvideo • Mix 10 video – http://tinyurl.com/velocitymix10video • ARCCast Video – http://tinyurl.com/velocityscotthavideo • ScottHa on Velocity – http://tinyurl.com/velocityhanselminutes
  • 16. References • AppFabric coverage on StackOverflow – http://tinyurl.com/stackoverflowvelocity – http://tinyurl.com/stackoverflowappfabric • DotNetRocks – http://tinyurl.com/dotnetrocksappfabric • Other .NET distributed caches – NCache - http://tinyurl.com/ncache – Memcached - http://tinyurl.com/smoe – Oracle Coherence – http://tinyurl.com/oraclecoherence – SharedCache – http://codeplex.com/sharedcache • Extensions Project – http://tinyurl.com/mscacheext • Admin Tool – http://mdcadmintool.codeplex.com/