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1.1 In the past it was thought that science is a knowledge derived from empirical facts, and that the facts based on observation and experimentation are empirical facts. empiricism; logical positivism//1.2 However, observation and experimentation require a format picture of knowledge, and the observation of the facts (most of the cases) is not provided by the senses to the observer. It is not possible to determine facts and derive knowledge from them first. To observe the infiltration theory//1.3 This contradiction is present, but it cannot be denied that scientific knowledge should not be proved by the facts of observation. The typical chicken or the first egg problem, the first observation and ...
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Due to the requirements of the project, it is necessary to submit yarn MapReduce computing tasks through Java programs. Unlike the general task of submitting MapReduce through jar packages, a small change is required to submit mapreduce tasks through the program, as detailed in the following code. The following is MapReduce main program, there are a few points to mention: 1, in the program, I read the file into the format set to Wholefileinputformat, that is, not to the file segmentation. 2, in order to control the treatment of reduce ...
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 ...
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This paper is an excerpt from the book "The Authoritative Guide to Hadoop", published by Tsinghua University Press, which is the author of Tom White, the School of Data Science and engineering, East China Normal University. This book begins with the origins of Hadoop, and integrates theory and practice to introduce Hadoop as an ideal tool for high-performance processing of massive datasets. The book consists of 16 chapters, 3 appendices, covering topics including: Haddoop;mapreduce;hadoop Distributed file system; Hadoop I/O, MapReduce application Open ...
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