File Compression Algorithms

File compression has two main benefits, one is to reduce the space occupied by storage files, the other is to speed up the data transmission. In the context of Hadoop's big data, these two points are particularly important, so let me now look at the file compression in Hadoop. Hadoop supports a wide variety of compression formats, we look at a table: Deflate is also using the LZ77 algorithm and Huffman coding (Huffman http://www.aliyun.com/zixun/aggregation/1552.html ...

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 ...

class= "Post_content" itemprop= "Articlebody" > Reddit has a post about the importance of the algorithm to our lives, and which algorithms contribute the most to modern civilization. If you know something about the algorithm, you might ask "does the author know what the algorithm is?" when reading this article. "or" is Facebook's information Feed an algorithm? "If the information flow is ...

Lrzip (Long Range ZIP) is a compression program that uses an unrestricted-size compressed window, and large files can achieve very high compression rates and speeds. It combines the Zpaq and LZMA compression algorithms to maximize compression, as well as the Lzo fastest speed, reducing rzip redundancy. The purpose of the design is to improve the size of the memory and to further improve the compression. Whether from scale, or optimization and speed are better compression ratios, can even provide compression algorithms, faster than gzip speed. Long Range ZI ...

Long Range ZIP 0.608 This version is faster in the rzip phase by using the Select Data Access feature. The Finish bash script is no longer the default installation and therefore does not implement package conflicts with the allocated bash. More non-Linux platforms for compilation of fixes. Lrzip (Long Range ZIP) is a compression program that can be used when a very high compression rate and a large file speed are achieved. It uses ZPAQ and maximum compression, maximum speed of zpaq and LZMA algorithm to compress algorithms, and long range R ...

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 ...

December 2014 12-14th, hosted by the China Computer Society (CCF), CCF large data Expert committee, the Chinese Academy of Sciences and CSDN co-organizer of the 2014 China Large Data Technology conference (DA data Marvell Conference 2014,BDTC 2014 will be opened at Crowne Plaza Hotel, New Yunnan, Beijing. The three-day conference aims to promote the development of large data technology in the industry, and to set up "large data Infrastructure" and "large data ..."