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1.HDFS Storage Architecture(1) HDFS Architecture--File1) The file is cut into chunks (default size 64M), in blocks, each block has multiple copies stored on different machines, the number of copies can be specified at the time of file generation (silentRecognition 3)2) NameNode is the master node that stores metadata such as file name, file directory structure, file attributes (generation time, number of co
used to simplify system-level software development, such as operating systems, user interfaces, and language processing. Typical examples include macapp and Microsoft's MFC.(2) middleware integration framework. It is used to assemble distributed applications and components. Typical examples include Microsoft's DCOM, Alibaba oft's RMI, And OMG's CORBA.(3) enterprise application framework. It is used in various application fields, such as telecommunications, manufacturing, and finance.It can be d
Research on layer-3 Architecture
Concept of three-tier architecture
User Interface presentation layer (USL)
Business logic layer (BLL)
Data access layer (DAL)
Bll separates usl from dal and adds Business Rules
Role of each layer
1: Data access layer: mainly refers to the operation layer for raw data (in the form of storing data such as databases or text files), rather than raw data, th
C/S architecture
C/S architecture can also be seen as a fat client architecture. Because the client needs to implement the vast majority of business logic and interface display. In this architecture, the part of the client takes a lot of pressure because the display logic and transaction processing are included, to me
Large Web site technology Architecture (i)--large-scale website architecture evolutionLarge Web site technology Architecture (ii)--Architecture modeLarge Web site technology Architecture (iii)--Architecture core elementsLarge Web
C/S architectureThe C/S architecture is a typical two-layer architecture. The entire process is Client/Server, that is, the Client Server architecture, the client contains one or more programs running on the user's computer, and there are two types of servers. One is the database server, and the client accesses the data on the server through the database connecti
http://blog.csdn.net/chaofanwei/article/details/27046795The so-called architecture, a popular saying is "the highest level of planning, difficult to change the decision", these plans and decisions laid the direction of the future development of things and the final blueprint.The software architecture is "an abstract description of the overall architecture and com
Introduction: This period of evolutionary architecture and emergent design will address the various topics related to evolutionary architecture, includes important differences between design and architecture (and how to differentiate between them), some of the problems you encounter when creating an enterprise-class architect
1. Architecture and framework design levels are different like hardware design, software design is divided into different levels. Typical software design levels are as follows: In this figure we can see that the framework is between micro-architectures and application level. DEISGN patterns is a micro-architectures-level design, and the framework is formed by multiple design pattern and other micro-architectural elements. The objectclasses, Micro-arch
1. Software Architecture Style
A core issue of software architecture design is the ability to use repetitive architectural patterns, that is, the ability to achieve architecture-level software reuse. This means that the same architecture can be used in different software systems. For this purpose, scholars began t
The root of software complexity comes from the complexity of thinking.
Three-tier architecture look at three-tier DDD Implementation detailed architecture look at Code Business Domain persistent layer (data layer) testing and use example complete code download
Handy weapon Library:
Fluent nhib.pdf
Nunit
Git (GitHub)
For the tools involved in this article, see the previous article: My. Net w
Large Web site technology Architecture (i)--large-scale website architecture evolutionEach pattern describes a problem that recurs around us and the core of the solution to the problem. This way, you can use the program again and again without having to do repetitive work.The so-called site architecture model is to solve the large-scale web site with high concurr
The following content is both my understanding and the translation of the content, the title of the translation is:N -tier architecture, including two aspects of the architecture. On the one hand, N-tier 's physical architecture, on the one hand, is the logical architecture of n-tier . In general terms, the physical
The contents of this article are organized from http://blog.csdn.net/tennysonsky/article/details/45062079The C/S architecture and B/s architecture are two influential software architectures. c/S is a long history and very mature architecture; b/S is a new generation architecture, derived from C/s, there are many innova
Distributed, microservices, cloud architectureJava language development, cross-platform, high-performance, high-availability, secure, service-based, modular, component-driven development modelFrom now on, I will record the process and the essence of the recently developed Springcloud micro-service cloud architecture, and help more friends who are interested in developing the Spring cloud framework, hoping to help more good scholars. Let's explore how
, such as secondary without the right to vote and priority set to 0.
Of course you can add a arbiter (arbiter) in a replica set schema, arbiter cannot hold a copy of the data, and the arbiter plays a controlling role in the replica set architecture, when replica The primary is not available in set, and it is necessary to re-elect other members as new primary. A replica set can have up to 12 members, and only 7 members can be voted on at the same
The previous article, "Python crawler: Crawling Sina News Data" explains in detail how to crawl Sina News Detail page related data, but the code construction is not conducive to subsequent expansion, each time the new detail page will need to be re-written again, so we need to organize it into functions, convenient to call directly.The details page captures 6 dat
ISEE Photo Experts use the crop to get the baby detail map. usually the seller opens the shop the picture, all is the own camera to take. A baby needs to take at least 4 or 5 photos to pick out a good one. Using iSEE's clipping function, cut the whole picture of a baby to get the baby detail map, which can save the number of photos and time.
First look at the camera pictures of the baby overall picture:
Editor's note: When it comes to OS X, the author's description is: In its delicate but unassuming UI, there are countless pursuits for detail. These details of the design will inadvertently let you experience the fruit for the perfect definition and the pursuit of the user experience. What are some of the most amazing and little-known details, where the authors have chosen 10 details designed to be considered "minority".
Before the OS X Yosemite is o
The master-slave composite structure (Master/detail) is based on "one-to-many" relationships, providing detailed information in a database table that accesses related records through foreign keywords from another database table. Based on the master-slave composite structure, we can browse the data in one table and give all the record information related to the record in another table. Borland C++builder provides a ttable and tquery type of database co
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