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https://issues.apache.org/jira/browse/MAPREDUCE-724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tom White resolved MAPREDUCE-724.
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Resolution: Duplicate
This was fixed in HADOOP-5691, both for trunk and the 0.20 branch.
> Reducer should not be abstract in order to serve as substitute for
> IdentityReducer
> ----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-724
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-724
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.1
> Reporter: Sean Owen
> Priority: Minor
>
> The old IdentityReducer class has been deprecated since the new Reducer
> class's default behavior is the very same. The @deprecated tag indicates
> Reducer is a substitute. However it is an abstract class and cannot be
> instantiated, which causes problems. I imagine it is just a matter of
> removing the 'abstract' keyword.
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