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were even 10 percent finished upgrading the computers, we'd identified a recall class bug and had to roll back Partial production upgrades that allow a service to run in a mixed mode of the next version alongside the current version allow the service to manage risk Rolling upgrades are similar to partial production upgrades but emphasize full automation of the deployment When a recall class bug is identified during deployment, fast rollback allows the service to get back to a last known good state quickly Many of our services have this process so well automated that they can run multiple overlapping upgrades on a single day In fact, some also have the ability to propagate all the new code (copy the code to all the production servers) with a go-live date (the date the user should see the new version).

var arr = [];

Packet ltering Firewalls should support inbound packet ltering and Stateful Packet Inspection (SPI). Protection from speci c attacks Firewalls should support protection from the

This allows the server to hold both the current and the previous version on the computer at the same time and allows a very rapid process for moving forward (read from the new directory) and moving back (read from the old directory) between versions Note With the release of the Windows Server 2008 operating system, the performance of virtualization has been significantly improved Virtualization, or virtual machines, is quite literally running another completely separate instance of the Windows operating system in the operating system that loads when a computer is turned on We are starting to see significant increases in the use of virtual machines as the way to deploy and run many Microsoft services In the next few years, this will likely become the most common method for rapid and fully automated deployments.

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Test Environments Whether the testing is focused on services, clients, or the integration of clients and services, getting the test environment just right is a critical element A test environment that is too different from the configuration that will be run in final production can miss many bugs A test environment that is so exactly like production that it is production can cost too much to build; if built, it will funnel all testing to a single environment Most services test teams in Microsoft run many different types of test environments, and each helps facilitate effective testing for different classes of defects The key to defining and using different test environments effectively is understanding the service architecture and integration dependencies.

internal static class FalseSharing { private class Data { // These two fields are adjacent and (most likely) in the same cache line public Int32 field1; public Int32 field2; } private const Int32 iterations = 100000000; // 100 million private static Int32 s_operations = 2; private static Int64 s_startTime; public static void Main() { // Allocate an object and record the start time Data data = new Data(); s_startTime = Stopwatch.GetTimestamp(); // Have 2 threads access their own fields within the structure ThreadPool.QueueUserWorkItem(o => AccessData(data, 0)); ThreadPool.QueueUserWorkItem(o => AccessData(data, 1)); // For testing, block the Main thread Console.ReadLine(); } private static void AccessData(Data data, Int32 field) { // The threads in here each access their own field within the Data object for (Int32 x = 0; x < iterations; x++) if (field == 0) data.field1++; else data.field2++; // Whichever thread finishes last, shows the time it took if (Interlocked.Decrement(ref s_operations) == 0) Console.WriteLine("Access time: {0:N0}", Stopwatch.GetTimestamp() - s_startTime); } }

DESCRIPTION Infrequent integrations are expensive. MOST FREQUENT SCALE Application REFACTORED SOLUTION NAME Integrate early, often, and automatically REFACTORED SOLUTION TYPE Process, software, technology REFACTORED SOLUTION DESCRIPTION Development teams need discipline, and tools, to effectively integrate with greater frequency. Once teams start integrating more often, they find that it gets much easier. TYPICAL CAUSES Laziness ANECDOTAL EVIDENCE No thanks, we ll wait. SYMPTOMS, CONSEQUENCES The longer that you take between integrations, the more expensive it gets.

C ha P ter 13 W eB a PP LI C a t I O N F r a M e W O r K S : r a I LS , S I N a t r a , a N D r a M a Z e