News
        
        Velocity CTP3 Released
        
        
        
			- By Kurt Mackie
 - April 10, 2009
 
		
        Microsoft this week rolled out the next community test  version of a distributed cache platform code-named "Velocity" that  promises to speed up .NET-based applications.
Velocity CTP3 (Community Technology Preview 3) was  published on Tuesday and can be downloaded here.  The CTP3 represents pre-beta testing; it's of interest mostly to technical reviewers.
The enhancements in the CTP3 include a new "cache  notifications" capability, plus the option to manage cache clusters using  SQL Server, according to Microsoft's  announcement. Performance and security were also enhanced with this release,  the Velocity team indicated. The application programming interfaces were  changed to reflect more typical Microsoft namespace conventions.
Microsoft added the cache notifications capability to help avoid  retrieving stale data. It also can be used to specify "an event-triggered  task" based on when an object is "added, replaced or removed" in  the cache, the Velocity team explained.
With CTP3, SQL Server can now be used instead of just the  lead hosts for cluster management. Adding SQL Server for cluster management helps  ensure that the cluster doesn't go down "due to an insufficient number of  (running) lead hosts," according to the Velocity team.
Velocity is a performance improvement utility for .NET-based  applications that caches data in memory across machines. Microsoft unveiled the  first CTP of Velocity in early  June.
The Velocity platform is similar  to memcached hash-table technology used to speed up Web sites built on the  LAMP (Linux, Apache, MySQL, PHP) stack, according to Dare Obasanjo, a Microsoft  program manager for the Contacts team. Velocity instead provides cache support  for Web sites using the WISC (Windows, IIS, SQL Server, C#) stack.
Velocity also adds scalability technology to caching.  Obasanjo explained that "you can add and remove servers from the cluster  and the cache automatically rebalances itself."     
        
        
        
        
        
        
        
        
        
        
        
        
            
        
        
                
                    About the Author
                    
                
                    
                    Kurt Mackie is senior news producer for 1105 Media's Converge360 group.