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https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892916#action_12892916
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Owen O'Malley commented on MAPREDUCE-1288:
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It looks good. I'd suggest:
1. change DistributedChache.releaseCache to pass in the current user to
TrackerDistributedCacheManager.releaseCache rather than creating a new method.
2. it looks like the constructor for CacheFile can easily throw IOException
instead of putting it in a RuntimeException.
> 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
> Priority: Critical
> Attachments: MR-1288-bp20-1.patch, MR-1288-bp20-2.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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