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MapReduce LearningMAP ": The main node reads input data, divides it into small chunks that can be solved in the same way (here is a divide-and-conquer idea), and distributes these small chunks to different working nodes (Worder nodes), each working node (worder node) Loop to do the same thing, this is going to be a tree-row structure (many of the models in distributed computing are related to graph theory, PageRank is also), and each leaf node has to

completes, the JDK folder will be generated in the/opt/tools directory./jdk-6u34-linux-i586.binTo configure the JDK environment command:[Email protected]:/opt/tools# sudo gedit/etc/profileTo enter the profile file, change the file:Export java_home=/opt/tools/jdk1.6.0_34Export Jre_home= $JAVA _home/jreExport classpath= $JAVA _home/lib: $JRE _home/lib: $CLASSPATHExport path= $JAVA _home/bin: $JRE _home/bin: $PATHSave file, closeExecute the following command to make the configuration file effectiv

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detailed code#!/usr/java/hadoop/envpythonFromoperatorimportitemgetterImportsysword2count={}Forlineinsys.stdin:Line=line.stripWord,count=line.splitTryCount=int (count)Word2count[word]=word2count.get (word,0) +countExceptvalueerror:Passsorted_word2count=sorted (word2count.items,key=itemgetter (0))Forword,countinsorted_word2count:print '%s\t%s '% (word,count)Test run Python to implement WordCount steps1) Install Python onlineIn a Linux environment, if P

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, supported DataTable, T:class, value type three types, can be easily docu the results of synchronization into a container.The use of taskable needs to pay attention to the amount of data obtained by each node can not be very large, by taking more and more memory operations, in the way of processing complex data in the operation of the query.5, using taskable for group query The query of the Statistical cla

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