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https://issues.apache.org/jira/browse/HADOOP-1231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12520431
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Nigel Daley commented on HADOOP-1231:
-------------------------------------
Doug, Tom, this is an incompatible API change. Can you please note that in
CHANGES.txt?
> Add generics to Mapper and Reducer interfaces
> ---------------------------------------------
>
> Key: HADOOP-1231
> URL: https://issues.apache.org/jira/browse/HADOOP-1231
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Owen O'Malley
> Assignee: Tom White
> Fix For: 0.15.0
>
> Attachments: HADOOP-1231-1.patch, HADOOP-1231.patch,
> HADOOP-1231.patch, MapReduceTypes.html
>
>
> By making the input and output types of the Mapper and Reducers generic, we
> can get the information from the classes and not require the user to set them
> in the configuration.
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