To work with wordcount mapreduce problem, you have to add 2 jars which you find inside the hadoop installation directory. Those jars are:


1) hadoop-mapredcue-client-core.jar


2) hadoop-commons-2.2.jar


These jars will be present under /path_to_/hadoop-2.2/share/hadoop/mapreduce and /path_to_/hadoop-2.2/share/hadoop/common


Kindly check below screen shot:





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