Definition Of File Compression

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 ...

"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 ...

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 ...

In the Zhangchuncheng, located in the Zhongguancun pioneering building, the new mobile phone. On the screen of the mobile phone, pedestrians on the road come and come, and the poplar swaying in the wind. "This is a real-time view of the HD camera at our company's doorstep and can be viewed on the phone anytime." Zhang is the founder of Beijing Qian Long Teda Technology Development Co., Ltd. 　　What he said is installed on the High-definition camera decoder, using the company's first in China to develop and research and development of successful lossless ultra-low compression image, video technology. Just over the past one months, with this decoder and the image compression technology behind it ...

Video surveillance as an important basis for verification, in the banking, judicial, safe City application is very wide, and with the development of technology and the needs of the times, many places are installed high-definition cameras. The data in these places need to be stored for 1-3 months or even more than half a year. 　　The advent of the era of high-definition, not only requires the High-definition camera, its storage screen also has the requirements of HD, which is the storage technology has put forward a great challenge. HD Monitoring storage Requirements According to the modern security monitoring of storage requirements can be summed up as a simple "five high": ...

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 ...

Through the introduction of the core Distributed File System HDFS, MapReduce processing process of the Hadoop distributed computing platform, as well as the Data Warehouse tool hive and the distributed database HBase, it covers all the technical cores of the Hadoop distributed platform. Through this stage research summary, from the internal mechanism angle detailed analysis, HDFS, MapReduce, Hbase, Hive is how to run, as well as based on the Hadoop Data Warehouse construction and the distributed database interior concrete realization. If there are deficiencies, follow-up ...

Cloud-based storage solution cloud storage is a new concept that extends and develops in the cloud Computing (cloudcomputing) concept, which means that a large number of different types of storage devices in the network can be assembled together through application software through the functions of cluster application, grid technology or Distributed File system. A system that provides data storage and business access functions together externally. With the development of network technology and the increase of bandwidth, cloud storage is becoming more and more promising in video surveillance, and cloud storage, as the vane of future development, mainly has the following advantages: ...

Through the introduction of the core Distributed File System HDFS, MapReduce processing process of the Hadoop distributed computing platform, as well as the Data Warehouse tool hive and the distributed database HBase, it covers all the technical cores of the Hadoop distributed platform. Through this stage research summary, from the internal mechanism angle detailed analysis, HDFS, MapReduce, Hbase, Hive is how to run, as well as based on the Hadoop Data Warehouse construction and the distributed database interior concrete realization. If there are deficiencies, follow-up and ...

E-Mail has become the most convenient way of communication in the Internet age, because of the freedom of the Internet, so the security of the mail is becoming more and more prominent. Today, with the popularity of the Internet, e-mail is becoming more and more popular, open a book or magazine newspaper, have an e-mail address, even the ads are marked with e-mail address; this has become a fashion, the most convenient way to communicate in the Internet era, save money, fast. It is because of the freedom of the Internet, so the security of the message is increasingly prominent. e-mail Message delivery, general ...