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https://issues.apache.org/jira/browse/MAPREDUCE-849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749451#action_12749451
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Sharad Agarwal commented on MAPREDUCE-849:
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For cluster level properties, I would prefer mapreduce.cluster.* instead of 
mapreduce.* as it won't be clear and would conflict with other namespaces. We 
should reserve the namespace for framework properties - mapreduce.cluster.*, 
mapreduce.jobtracker.*, mapreduce.tasktracker.*, mapreduce.client.*, 
mapreduce.job.* etc.

> Renaming of configuration property names in mapreduce
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-849
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-849
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: Config changes.xls, Config changes.xls
>
>
> In-line with HDFS-531, property names in configuration files should be 
> standardized in MAPREDUCE. 

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