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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 ...

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 ...

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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. ...

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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 ...

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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 ...

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