文件名称:
Continuous Delivery
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上传时间: 2012-02-26
详细说明： Yesterday your boss asked you to demonstrate the great new features of your system to a customer, but you can’t show them anything. All your developers are halfway through developing new features and none of them can run the application right now. You have code, it compiles, and all the unit tests pass on your continuous integration server, but it takes a couple of days to release the new version into the publicly accessible UAT environment. Isn’t it unreasonable to expect the demo at such short notice? You have a critical bug i n production. It is losing money for your business every day. You know what the fix is: A one-liner in a library that is used in all three layers of your three-tier system, and a corresponding change to one database table. But the last time you released a new version of your software to production it took a weekend of working until 3 A.M., and the person who did the deployment quit in disgust shortly afterward. You know the next release is going to overrun the weekend, which means the application will be down for a period during the business week. If only the business understood our problems. These problems, although all too common, are not an inevitable outcome of the software development process: They are an indication that something is wrong. Software release should be a fast, repeatable process. These days, many companies are putting out multiple releases in a day. This is possible even with large projects with complex codebases. In this book, we will show you how this is done. Mary and Tom Poppendieck asked, “How long would it take your organization to deploy a change that involves just one single line of code? Do you do this on a repeatable, reliable basis?”1 The time from deciding that you need to make a change to having it in production is known as the cycle time, and it is a vital metric for any project. ...展开收缩
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