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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-25) a new map/reduce example and moving the examples from src/java to src/examples
Date Wed, 08 Feb 2006 00:45:01 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-25?page=all ]

Owen O'Malley updated HADOOP-25:

    Attachment: examples-2.patch

Ok, here is a new patch.

I added the generic "jar" option to bin/hadoop. 
To get it to work right, I couldn't use the -jar option to java because it ignores the -cp
option, so I implemented a utility function that looks in a jar file to find the Main-Class
attribute. (org.apache.hadoop.util.PrintJarMainClass)

I moved the examples to org.apache.hadoop.examples.

I created a example driver that you can give either 'wordcount' or 'grep' to run the appropriate
class and made it the Main-Class of the example jar file.

I made the map and reduce arguments optional to WordCount. (I thought about using jakarta-common-cli,
but it just cluttered up the example.)

I changed the Map class to MapClass so that it didn't conflict with java.utils.Map and put
in a javadoc.

I pulled the examples out of the compile and jar targets and added it to the test target.

> a new map/reduce example and moving the examples from src/java to src/examples
> ------------------------------------------------------------------------------
>          Key: HADOOP-25
>          URL: http://issues.apache.org/jira/browse/HADOOP-25
>      Project: Hadoop
>         Type: Improvement
>   Components: mapred
>     Reporter: Owen O'Malley
>     Priority: Minor
>  Attachments: examples-2.patch, examples.patch
> The new example is the word count example from Google's paper. I moved the examples into
a separate jar file to demonstrate how to run stand-alone application code.

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