mapreduce programming tutorial

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(args[1]));//Output path Job.setmapperclass (Scoremapper.class);//MapperJob.setreducerclass (Scorereducer.class);//Reducer Job.setmapoutputkeyclass (Text.class);//Mapper key Output typeJob.setmapoutputvalueclass (Scorewritable.class);//Mapper value Output type Job.setinputformatclass (Scoreinputformat.class);//Set Custom input formats Job.waitforcompletion (TRUE);return 0;} public static void Main (string[] args) throws Exception{string[] Args0 =// {"Hdfs://hadoopmaster:9000/score/score.txt","H

A multi-table association is similar to a single-table association, and it also takes care of the information from the original data by processing it in some form. As followsThe input is two files, one represents the factory table, contains the factory name and address number column, and the other represents the address list, which contains the address list and address number columns.Required to find the corresponding relationship between factory name and address name from input data, output fac

Use PHP and Shell to write Hadoop MapReduce programs. So that any executable program supporting standard I/O (stdin, stdout) can become hadoop er or reducer. For example, copy the code as follows: hadoopjarhadoop-streaming.jar-input makes any executable program that supports standard IO (stdin, stdout) become hadoop mapper or reducer. For example: The code is as follows: Hadoop jar hadoop-streaming.jar-input SOME_INPUT_DIR_OR_FILE-output SOME_OUTPUT

Enables any executable program that supports standard IO (stdin, stdout) to be the mapper or reducer of Hadoop. For example: Copy CodeThe code is as follows: Hadoop jar Hadoop-streaming.jar-input Some_input_dir_or_file-output Some_output_dir-mapper/bin/cat-reducer/usr/bin /wc In this case, is it magical to use Unix/linux's own cat and WC tools as mapper/reducer? If you're used to using some dynamic language to write mapreduce in a dynamic language,

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Link to the PHP object-oriented programming getting started tutorial, and the OOP Getting Started Tutorial. Link to the PHP object-oriented programming getting started tutorial, the OOP Getting Started Tutorial PHP official learni

Tutorial on interrupt and return in Ruby programming and tutorial on ruby programming usage The use of the return, break, and next keywords involves the issue of jumping out of the scope. Their difference lies in the different scopes of different keywords jumping out, because there are code blocks, you need to pay spec

Link to the PHP Object-Oriented Programming getting started tutorial and the OOP getting started tutorial PHP learning OOP: http://php.net/manual/zh/oop5.intro.php Source: http://blog.snsgou.com/post-41.html PHP object-oriented programming full Tutorial: 1. What is object

as the characteristics of the object-oriented programming, and is improving the template-characterized generic programming. C + + is a hybrid programming language, which can be programmed by program design method for various purposes. It does not abandon the practical characteristics of efficient operation, but also strives to improve the

PHP object-oriented programming (video tutorial ). Object-oriented programming (ObjectOrientedProgramming, OOP, object-oriented programming) is a computer programming architecture, one of the basic principles of OOP is that a computer program is a computer

Training and Development Cooperation: Tel: 18610086859 Email: hiheartfirst@gmail.com QQ: 1740415547 QQ: 148325348 Guoshi studio is better for you! View other parts:Overall description and Chapter index of this tutorial PDF download link Interface Programming-Why? Direct education Use Cases: "There will be a meeting here in sixteen years; couples will never lose their trust in eac

pure OOP in PHP to declare classes, and use only objects and classes in your project. I'm not going to say much about this concept, because there are a lot of friends away from object-oriented programming is the main reason is a contact with the object-oriented concept when the understanding is not up, so do not want to learn. After reading the whole content of the reader, then go to the concept to understand it. First video tutorial:Bkjia Video

imeasure type, and call the method in which to calculate the area and perimeter of the triangle with an edge length of 10.6.5>: In addition to the design of a new class, while inheriting the following interface Iameasure and the 2nd above the imeasure, in addition to providing a specific length of the equilateral triangle side length and the area of the calculation method, but also realized the iameasure of areas () members, Provides a method for calculating the square area.Interface Iameasure{

the exit string, the connection is closed directly.To test this server program, we also need to write a client program:Note that the client program runs out, and the server program will run forever, you must press CTRL + C to exit the program.SummarySocket programming with the TCP protocol is very simple in Python, for the client, to actively connect to the server's IP and the specified port, for the server, to first listen to the specified port, and

Linux Serial Programming Tutorial (iii)--serial port programming detailed Preface: This chapter will formally explain the serial port programming technology, uses a serial port to send and receive the data the procedure, comes step-by-step explanation. Note: You can download my source code for reference. Open serial P

JSP Programming Development tutorial _ data exchange and jsp Programming Development JSP Programming Development tutorial _ data exchange. JSP uses the Java scripting language embedded in HTML to affect dynamic page requests. Forwarding plays a role on the server. It refe

Original place: TWISTED-INTRO-CN Dave Translator: Yang Xiaowei Luocheng LikebetaReprint statement: The copyright belongs to the original made all, reproduced only to let more people see this excellent works collection, if infringement, please leave a message to informThanks: thank Yang Xiaowei Luocheng Likebeta for the milestone contribution to the domestic twisted coderOther: Access to GitHub's children's shoes, please visit the source link. Because the source layout is very good! 1.Twisted t

PHP programming daily must-learn form validation, PHP programming form This article explains the implementation of PHP form verification, share to everyone for reference, the specific content as follows 1.PHP form ProcessingWelcome.html welcome.php Welcome Your Email address is: 2.PHP Form Validation Complete instance PHP Validation Example* Required Fields Your input:"Echo $name; echo""Echo $ema

This article mainly introduces the concepts related to JavaScript object-oriented programming, such as classes, objects, attributes, methods, and other object-oriented terms, and explains the use of various terms with examples, this is a very good object-oriented getting started tutorial. You can refer to other languages. Although object-oriented JavaScript is different from other languages, this leads to s