tailieunhanh - the art of scalability scalable web architecture processes and organizations for the modern enterprise phần 2

Các ví dụ sau đây sử dụng siteleds tên để chỉ gói của chúng tôi. Khi tạo một phần mở rộng mới, cho nó một tên duy nhất và thay thế tất cả các lần xuất hiện của siteleds với tên của phần mở rộng của và quản lý huấn luyện viên bóng đá chuyên nghiệp biết rằng có đội ngũ để hoàn thành nhiệm vụ là rất quan trọng để đạt | Chapter 2 Roles for the Scalable Technology Organization 100 consistent with the design. For instance if a design calls for a configurable number max number undefined of similarly configured read databases to which all read transactions can be evenly distributed and the software engineer implements a system capable of handling up to five read databases he or she has implemented a system with a defined scale limit. Here defined scale limit is the limitation the engineer put on how many databases can be implemented five . A software engineer should understand the portion of the system that she supports maintains or for which she creates code. He should also understand the end user and how the end user interacts with the software engineer s portion of the system. The software engineer is a contributor to many of the scalability processes we define later in part ii. Operator The operator is responsible for handling the daily operations of the production system whether that system is a Web system or a back office it system. She is responsible for monitoring the system against specific service levels monitoring for out of bounds conditions alerting individuals based on service level or boundary condition failures and tracking incidents to closure. A form of operator sometimes called an incident manager is responsible for managing major problems to closure and issuing root cause and corrective action reports. Infrastructure Engineer Infrastructure engineer is a generic term used to identify database administrators network engineers and systems administration professionals. The infrastructure engineer is responsible for the selection configuration implementation tuning and proper functioning of the devices or systems under his purview. The infrastructure engineer more than any other role is responsible for the scalability of the systems that he supports. As such a database analyst is responsible for identifying early when his database is going to fail based on capacity