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Date: Fri, 23 Apr 2010 14:12:52 -0400 (EDT)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1288) DistributedCache localizes only
 once per cache URI
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860339#action_12860339 ] 

Allen Wittenauer commented on MAPREDUCE-1288:
---------------------------------------------

That sounds like really bad behavior.

Why should an old job fail because of what is, essentially, an external event?  

This still sounds like a blocker to me.

> 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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