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Velocity - Edge UG

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Velocity - Edge UG

  1. 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. 2. Agenda • What is AppFabric? • Why a Distributed Cache? • Configuring a client • Configuring a server • Managing a cache • Concurrency • High availability / load balancing
  3. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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 
  14. 14. Questions? phil@philippursglove.com http://philpursglove.blogspot.com http://www.philippursglove.com/Velocity http://twitter.com/philpursglove http://slideshare.net/philpursglove
  15. 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. 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/

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