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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1288) DistributedCache localizes only once per cache URI
Date Fri, 11 Dec 2009 05:55:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789128#action_12789128
] 

Hemanth Yamijala commented on MAPREDUCE-1288:
---------------------------------------------

I suppose one could argue that if two different users can access the same set of files on
the DFS for localization, they are 'public'. But then, you could theoretically construct a
use case where there's a 'group' access for some files on DFS and these are localized per
user on the task tracker. Is that what we're trying to address ?

> 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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