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Next: Architecture Design: System Storage (4)-Block storage scheme (4)1. mysql OverviewFrom the beginning of this paper, we will discuss the performance optimization scheme and cluster scheme of the relational database based on the block storage scheme. The selection of a relational database will target the most widely used MySQL data in startups and the Internet industry, but the MySQL installation process and basic usage knowledge are not within our
affect other sub-services, which means that the change is transparent to others.
In the following sections, we can see the application of Messaging.DatabaseOpenStack components need to maintain their own state information. For example, Nova has a virtual machine in the specification, state, and this information is maintained in the database. Each OpenStack component has its own database in MySQL.650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-2016
In the previous article, "the page layout of the HTML 5 game against Flash", we introduced a design process for a Web page that complies with the HTML5 standard, and in this article we continue on to the HTML5 journey, immediately following the previous article.Comment Area of the articleIn the post-reader comment area, we are using the sections tag, as follows:/
FileSplitter10 {one string m_filepath;12 int m_filenumber;13 listDefined:Defines a one-to-many (varying) dependency between objects so that when the state of an object (Subject) changes, all objects that depend on it are notified and updated automatically.Class Diagram:observer:iprogress; Update (): Doprogress ().Concretesubject:filesplitterConcreteobserver:mainform/consolenotifierDepending on the standard observer schema definition, the addiprogress
the target and the observer, thus making the dependencies between them loosely coupled.2. When a target sends a notification, it is not necessary to specify the observer, and the notification will be automatically propagated (with the notification information as a parameter).OnProgress (Progressvalue);//Send notifications without regard to specific observer issues.3. The observer decides whether to subscribe to the notification, and the target object knows nothing about it.Splitter.addiprogress
lot of details, we will discuss in detail in later chapters.The design idea of CinderCinder continues the design ideas of Nova and other components.API front-end servicesCinder-api as a unique window to the cinder component, exposing clients to the functionality that cinder can provide, when the customer needs to perform volume-related actions and can only send REST requests to CINDER-API. Customers here i
does not affect other sub-services, which means that the change is transparent to others.
In the following sections, we can see the application of Messaging.DatabaseOpenStack components need to maintain their own state information.For example, Nova has a virtual machine in the specification, state, and this information is maintained in the database.Each OpenStack component has its own database in MySQL.SummaryNova is the most important component in OpenStack and is also a typical component
affect other sub-services, which means that the change is transparent to others.
In the following sections, we can see the application of Messaging.DatabaseOpenStack components need to maintain their own state information. For example, Nova has a virtual machine in the specification, state, and this information is maintained in the database. Each OpenStack component has its own database in MySQL.SummaryNova is the most important component in OpenStack and is also a typical component. Nova
refactoring process. As the system develops, you will find that you need a new class and need to drag the existing work responsibilities to the new class. This week's seemingly reasonable and correct design decisions may not be correct by the next week. This is no problem. If you have never encountered such a situation, it will be a problem.
If you find that more functions are used for a field in another class other than its resident class, you shoul
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