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Original: http://hadoop.apache.org/core/docs/current/hdfs_design.html Introduction Hadoop Distributed File System (HDFS) is designed to be suitable for running in general hardware (commodity hardware) on the Distributed File system. It has a lot in common with existing Distributed file systems. At the same time, it is obvious that it differs from other distributed file systems. HDFs is a highly fault tolerant system suitable for deployment in cheap ...

Translation: Esri Lucas The first paper on the Spark framework published by Matei, from the University of California, AMP Lab, is limited to my English proficiency, so there must be a lot of mistakes in translation, please find the wrong direct contact with me, thanks. (in parentheses, the italic part is my own interpretation) Summary: MapReduce and its various variants, conducted on a commercial cluster on a large scale ...

With the extensive deployment of multi-core systems, clusters, grids and even cloud computing in recent years, virtualization technology has become more and more advantageous in business applications, not only reducing it costs, but also enhancing system security and reliability, and the concept of virtualization has gradually deepened into people's daily work and life. Aiming at the x86 platform, this paper first gives the basic concept and classification of virtualization technology, then expounds the realization principle and challenge of pure software virtualization, and finally introduces ...

The GNU Xorriso is a tool for creating, loading, processing, and writing the ISO 9660 file system for the Rock Ridge extension. Files can be copied and exported. This session result is written to optical media or file system objects without the need for external tools for ISO 9660 fabrication and cd/dvd/bd burning, providing static compilation libburnia-project.org, so the GNU Xorriso depends only on the underlying operating system's devices. GNU Xorriso 1.1.6 ...

Yes, there are bugs in any software, even our own flaws, because programmers are just ordinary people, and as long as the person will make mistakes. When someone encounters a software bug while using the software, you need to use your email to form a bug and then send it to the developer. 　　Developers can fix problems by locating problems and reproducing problems based on the report. But in many cases, it is difficult for developers to understand the user submission of the defect report, because the sender does not understand what we need, that should be ...

What is the retail O2O? In simple terms, is the line under the combined way to sell goods, even if the line play a supporting role, such as online payment or marketing is also counted as retail O2O. Retail O2O is based on the Internet, each retail business is determined by the basic conditions, traditional supermarkets, department stores, convenience stores based on information technology, logistics and urban settlements. Shopping demand is real, the key is the user to use what kind of shopping, a few years ago, the rapid popularity of PC Internet, so that the creation of Ali, Jingdong, only goods and other pure electric business model, in recent years, the popularity of smart phones, the subway almost all people are close to stare ...

Intermediary transaction SEO troubleshooting Taobao Cloud host Technology Hall for the first time to write a little and stationmaster related things, before always look at other people's articles, absorbing other people's experience and essence. 　　Today because of leisure, so also to summarize my site for a year some novice webmaster often make mistakes, I hope to be able to help the novice webmaster, less take some detours. First error site name selection error The first time to do a Web site is to do a forum, that is because in the Red Guest league to apply for a moderator, together under the decision to do a forum, so went to 5d6d application for a ...

1, requirements analysis before the preparation in the software development process, demand analysis is one of the core tasks it is a matter of no doubt that it is like a fleet of ships to be sailing, to arrive in the directory at a specified time, then they need a proper route before they can reach their destination, but if there is an error in the course, They will arrive in error, even do not return to the original will never arrive, such as important things, in the domestic many teams are very missing, although I have done some, but when the project is completed, when we look back, I found in fact ...

The most missing of China Mobile Internet is the innovative spirit that the Internet has arisen. In the face of internal and external pressure, China's internet industry needs to start.　　Once again, we need the courage and boldness to start from the zero, innovate to meet the opportunities and challenges of the mobile internet wave reporter Wang Yunhui Tri Feng Zhang Daosheng Cheng Nanting Although China has more advantages in the mobile internet than in the desktop internet era, the industry is still worried if the long-term strategic level is examined. In the industry, a recognized view is that the Chinese Internet over the past decade compared with other industries have "three high": ...

January 2013, Baidu CEO Robin Li in the 2012 performance of Baidu "Company coefficient" a column rating is 0. In the view of many employees, this is Robin (Li's English name) on Baidu in the "mobile Internet" performance is not satisfied. This unprecedented assessment of how many employees began to spit on the internet will not shrink the year-end award, because the company's coefficient accounted for 30% of the year-end award. This "0 points" also gives employees a signal that after the spring festival, the pressure will be transmitted from top to bottom of every nerve. The previous November 2012, Li in Baidu internal ...