Text File Compression Algorithm

1 compression in general, the computer processing of data exist some redundancy, at the same time, the data, especially the correlation between adjacent data, so you can through some different from the original encoding of the special encoding method to save data, so that the data occupy a small amount of storage space, this process is generally called compression. The concept of compression corresponds to decompression, the process of restoring compressed data from a special encoding to the original data. Compression is widely used in mass data processing, compression of data files, can effectively reduce the space required to store files, and speed up data on the network or to ...

I. Summary this article summarizes how to enable gzip compression for Web sites that are hosted by IIS, thereby reducing the network transmission size of web pages and increasing the speed at which users display pages. Two. Foreword. The knowledge of this paper is from the Internet collection and collation, mainly from the Chinese wiki. When you use YSlow to detect which optimizations are enabled on your Web site, gzip is a critical item, and starting GIP compression will immediately reduce the network transmission size of the page. Three. HTTP Compression overview HTTP compression is a way to transfer compressed text content between Web servers and browsers. H ...

Using Lzo compression algorithms in Hadoop reduces the size of the data and the disk read and write time of the data, and Lzo is based on block chunking so that he allows the data to be decomposed into chunk, which is handled in parallel by Hadoop. 　　This feature allows Lzo to become a very handy compression format for Hadoop. Lzo itself is not splitable, so when the data is in text format, the data compressed using Lzo as the job input is a file as a map. But s ...

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 ...

Intermediary trading http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall everyone do site optimization, the most likely when all consider is the station optimization and the chain. 　　Hefei SEO today mainly to say some gzip compression on site optimization has an impact. GZIP Compression: Accurate performance of the server is optimized, of course, I think gzip can be considered as a station optimization ...

Intermediary transaction SEO diagnosis Taobao Guest Cloud mainframe technology hall Google robot-what a magical dream of the boat! He knows our soul and every part. 　　Maybe he's not looking for something unique; he has read about billions of other sites (although we also share our data with other search engine bots), but tonight, as a website and Google bots, we will really know each other. I know it's never been a good idea to be overly analytical on a first date. We will pass a series of articles, a little bit ...

The first time to write technical blog, there are not satisfactory place, but also forgive and correct me. Why want to organize this kind of content, I feel like a painter to understand his paint and canvas, sculptor to understand his stone, as a web designer should also have some understanding of the characteristics of the picture format, so as to better express your ideas and ideas. In addition, we also encounter many problems with the format of the picture in our daily work. For example, designers will wonder why some of the output of the page is always unable to achieve the design of the quality and effect, what kind of design is more suitable for Web pages ...

"Csdn Live Report" December 2014 12-14th, sponsored by the China Computer Society (CCF), CCF large data expert committee contractor, the Chinese Academy of Sciences and CSDN jointly co-organized to promote large data research, application and industrial development as the main theme of the 2014 China Data Technology Conference (big Data tec on the Hnologyconference 2014,BDTC 2014) and the second CCF large data academic conference in Beijing new Yunnan Crowne Plaza grand opening. 2014 China Large data Technology conference ...

This is the second of the Hadoop Best Practice series, and the last one is "10 best practices for Hadoop administrators." Mapruduce development is slightly more complicated for most programmers, and running a wordcount (the Hello Word program in Hadoop) is not only familiar with the Mapruduce model, but also the Linux commands (though there are Cygwin, But it's still a hassle to run mapruduce under windows ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host Technology Hall preface: This article collects some predecessors ' some about the picture optimization skill, gathers together in this, for each method optimization principle has done some research, hoped can give everybody to the picture optimization this piece to play the role of the discussion. Referring to the picture, we had to start with a bitmap, a bitmap image (bitmap), also known as a dot-matrix image or a drawing image, made up of a single point called a pixel (picture element). These points ...