[Lucene-hadoop Wiki] Update of "WordCount" by HairongKuang

[Apache Wiki <wi...@apache.org>]

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.

The following page has been changed by HairongKuang:
http://wiki.apache.org/lucene-hadoop/WordCount

New page:
= WordCount Example =

'''WordCount''' example reads text files and counts how often words occur.  The input is text files and the output is text files, each line of which contains a word and the count of how often it occured, separated by a tab.

Each mapper takes a line as input and breaks it into words. It then emits word and 1 pair. Each reducer sums the frequencies of a word.

The output of maps are locally summed by setting the comibiner class to be the same as the Reducer class.

To run the example, the command syntax is[[BR]]
bin/hadoop org.apache.hadoop.examples.WordCount [-m <#maps>] [-r <#reducers>] <in-dir> <out-dir>