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1. The introduction of the Hadoop Distributed File System (HDFS) is a distributed file system designed to be used on common hardware devices. It has many similarities to existing distributed file systems, but it is quite different from these file systems. HDFS is highly fault-tolerant and is designed to be deployed on inexpensive hardware. HDFS provides high throughput for application data and applies to large dataset applications. HDFs opens up some POSIX-required interfaces that allow streaming access to file system data. HDFS was originally for AP ...

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 ...

Some time ago the author of a website because robots.txt file errors were written several characters, resulting in the site is not included. At that time feel very wrong, check to check to go also did not check out what the problem, later login googlehttp://www.aliyun.com/zixun/aggregation/8984.html "> 　Webmaster Center Diagnostic site to see the robots file organization of any search engine spider access only to find problems, after rehabilitation, included normal. ...

I believe you webmaster are dynamic CMS Station, then, the site root directory should have a template template folder, if you do not want to let search engines Crawl template Template folder under the template file, then write robots.txt file should pay attention to a point: (very main) example one: " Disallow:/template "means that/help.html and/template/index.html do not allow search engine spiders to crawl. Example two: "D ...

Absrtact: Hello, I am specialized in SEO, for several months have been in the maintenance and optimization of the massage list www.yziyuan.com this site, and summed up a lot of experience and knowledge. Today to share is the "search engine basics and work principle", which is good, I am specialized in SEO, for several months has been in the maintenance and optimization of the massage list www.yziyuan.com this site, and summed up a lot of experience and knowledge. Today to share is "search engine basics and work principle", this is the most basic ...

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall search engine history notes #e# 2006 Low, received a friend commissioned to help tidy up the development of the search engine history, so the Spring Festival spent a little time to sort out a rough history. Consider yourself a little note about internet history. 1, the development history of the search engine 1 A brief history of search history The origin of the "Aceh" web search engine can be traced back to 1991 years. The first ...

This is a UI template specification, B / S version of the application is more applicable, in fact, such a thing is not what the formal norms, just to adapt to the development environment we are now facing and organizational processes to make some expeditious efforts , And to solve some problems with the program communication and interface, try to avoid misunderstanding and friction. First, the applicable environment and object Second, the necessity Third, the technical principles Fourth, the code writing norms Fifth, the page template specification First, the applicable environment and objects This specification applies to browser-based B / S version of the software project development. Template development process template page writing and template files apply ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall one, the website log file where? "Simple said Web site Virtual host FTP several folder description" after the successful virtual host, will be in your FTP automatically generated 4 folders, respectively: "Databases", "Logofiles", "others", "wwwroot", they function as follows: ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall htaccess file has always been the domestic and international SEO experts carefully studied a file, because the file in many cases take over the site's highest configuration (such as virtual host), If you can reasonably use the good. htaccess file, not only can achieve the unexpected SEO effect, but also can solve a lot of problems related to the site. htaccess file is exactly the file below the Linux system, as can be seen from its filename. And ...

In addition to the "normal" file, HDFs introduces a number of specific file types (such as Sequencefile, Mapfile, Setfile, Arrayfile, and bloommapfile) that provide richer functionality and typically simplify data processing. Sequencefile provides a persistent data structure for binary key/value pairs. Here, the different instances of the key and value must represent the same Java class, but the size can be different. Similar to other Hadoop files, Sequencefil ...