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https://issues.apache.org/jira/browse/MAPREDUCE-2065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909187#action_12909187
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Ranjit Mathew commented on MAPREDUCE-2065:
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The tutorial for 0.20.2 is here:
http://hadoop.apache.org/common/docs/r0.20.2/mapred_tutorial.html
and contains only the one JAR that you expect.
The current tutorial:
http://hadoop.apache.org/mapreduce/docs/current/mapred_tutorial.html
lists three separate JARs because after 0.20.2 the project was split into
"common", "hdfs" and "mapreduce", each having its own JARs.
> Tutorial includes overly specified compilation command
> ------------------------------------------------------
>
> Key: MAPREDUCE-2065
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2065
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 0.20.2
> Reporter: Clarence Gardner
> Priority: Trivial
>
> The tutorial (mapred_tutorial.html) shows a command line to compile the
> wordcount program. It specifically mentions three Hadoop-supplied jar files
> in the classpath, but in my 0.20.2 installation (and I assume, later ones as
> well), only one is necessary, that being "core". In fact, the mentioned
> mapred and hdfs jars are not even present in my HADOOP_HOME directory.
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