Compressing Compressed Files

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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 ...

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 ...

System backups are important because you never know when a hard drive is going to strike or a disaster will come quietly. Here are some ways to back up. To backup from the command line use the TAR command This method applies to the home folder of the backup user. Open the terminal and enter: Tar CVFZ output input using the split command allows a compressed mirror to be partitioned into small chunks to be stored in a removable device. For more information, see: Backupyoursystem/tar using the DD command to create a disk image ...

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In website optimization, if the picture is optimized well, not only can improve the loading speed of the page, improve the user experience of the website, but also can save the bandwidth of the website through image optimization. So as a page construction engineer should adopt what method to optimize the picture, both to ensure the restoration of UI, but also make the picture the most streamlined? Here I personal experience, to briefly introduce the method of image optimization, first of all, we know some pictures of knowledge: 1. & http: //www.aliyun.com/zixun/aggregation/37954 ...

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After Facebook abandoned Cassandra, HBase 0.89 was given a lot of stability optimizations to make it truly an industrial-grade, structured data storage retrieval system. Facebook's Puma, Titan, ODS time Series monitoring system uses hbase as a back-end data storage System. 　　HBase is also used in some projects of domestic companies. HBase subordinate to the Hadoop ecosystem, from the beginning of the design of the system is very focused on the expansion of the dynamic expansion of the cluster, load are ...