[jira] Commented: (MAPREDUCE-1288) DistributedCache localizes only once per cache URI

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789095#action_12789095 ] 

Arun C Murthy commented on MAPREDUCE-1288:
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I'm assuming this is done only for 'private' cache files? i.e. public cache files should probably use the 'username' of the TT itself?

> 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: security, tasktracker
>    Affects Versions: 0.21.0
>            Reporter: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.21.0
>
>
> 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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