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https://issues.apache.org/jira/browse/HADOOP-3261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590537#action_12590537
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Doug Cutting commented on HADOOP-3261:
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What applications would benefit from this?
Also, wouldn't we want to implement this for partitioners, inputformats,
outputformats, comparators, etc. too?
> Allow Mapper and Reducer classes to be created a Spring Beans
> -------------------------------------------------------------
>
> Key: HADOOP-3261
> URL: https://issues.apache.org/jira/browse/HADOOP-3261
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Environment: All
> Reporter: Dennis Kubes
> Assignee: Dennis Kubes
> Attachments: HADOOP-3261-1-20080415.patch, spring.jar
>
>
> This improvement abstracts the creation of Mappers and Reducers in factory
> classes and adds the ability to define a spring beans.xml file in the
> classpath and have the Mapper and Reducer classes be created as spring beans.
> This is transparent to the rest of Hadoop but the benefit is that is allows
> Mapper and Reducer classes to have their dependencies injected versus having
> them hardcoded. This will help in the ability to test various mapreduce jobs.
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