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https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894620#action_12894620
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Owen O'Malley commented on MAPREDUCE-1288:
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Looks good. +1
> DistributedCache localizes only once per cache URI
> --------------------------------------------------
>
> Key: MAPREDUCE-1288
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1288
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distributed-cache, security, tasktracker
> Affects Versions: 0.21.0
> Reporter: Devaraj Das
> Assignee: Devaraj Das
> Priority: Critical
> Fix For: 0.22.0
>
> Attachments: MR-1288-bp20-1.patch, MR-1288-bp20-2.patch,
> MR-1288-bp20-3.patch, MR-1288-trunk-1.patch
>
>
> As part of the file localization the distributed cache localizer creates a
> copy of the file in the corresponding user's private directory. The
> localization in DistributedCache assumes the key as the URI of the cachefile
> and if it already exists in the map, the localization is not done again. This
> means that another user cannot access the same distributed cache file. We
> should change the key to include the username so that localization is done
> for every user.
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