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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1288) DistributedCache localizes only once per cache URI
Date Mon, 02 Aug 2010 17:51:21 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894620#action_12894620
] 

Owen O'Malley commented on MAPREDUCE-1288:
------------------------------------------

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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