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https://issues.apache.org/jira/browse/MAPREDUCE-1440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828780#action_12828780
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Owen O'Malley commented on MAPREDUCE-1440:
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The multi-realm case is why we need the mapping. MapReduce needs a unique local
username to run the processes as. The local name is the user that the task runs
as and determines the groups. Any authentication names that merge into a single
local username, need to be the same person.
> MapReduce should use the short form of the user names
> -----------------------------------------------------
>
> Key: MAPREDUCE-1440
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1440
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: security
> Reporter: Owen O'Malley
> Fix For: 0.22.0
>
> Attachments: m-1440.patch
>
>
> To minimize disruption on MapReduce, we should use the local names (ie.
> "omalley") rather than the long names (ie. "omal...@apache.org" as the basis
> for the username in MapReduce.
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