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https://issues.apache.org/jira/browse/HADOOP-5107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741964#action_12741964
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Doug Cutting commented on HADOOP-5107:
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> I was having problems getting the build the use the version of Ivy it 
> downloads.

Avro handles this better:

http://svn.apache.org/viewvc/hadoop/avro/trunk/build.xml?view=annotate#l128

Ivy's jar is stored in the lib/ directory.  If the specified version of Ivy 
isn't there, it removes all versions before downloading.  Also, one need never 
specify offline=true, since, so long as the specified version is there, it 
doesn't contact the network.

> split the core, hdfs, and mapred jars from each other and publish them 
> independently to the Maven repository
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-5107
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5107
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: build
>    Affects Versions: 0.20.0
>            Reporter: Owen O'Malley
>            Assignee: Giridharan Kesavan
>         Attachments: common-trunk.patch, hdfs-trunk.patch, 
> mapreduce-trunk.patch
>
>
> I think to support splitting the projects, we should publish the jars for 
> 0.20.0 as independent jars to the Maven repository 

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