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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4493) Localized files from DistributedCache should have right access-control
Date Mon, 10 Aug 2009 17:45:15 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741439#action_12741439
] 

Hemanth Yamijala commented on HADOOP-4493:
------------------------------------------

Had a chat with Owen to get more details. Here is the summary:

 - To download the files from distributed cache, we will use the user's JobConf for getting
the file system handle. Owen feels any changes to Hadoop security will be abstracted here
and hence we will not be affected.
- In this JIRA, we'll manage a per user cache where the downloaded cache files will be managed
securely as done in MAPREDUCE-842 (ownership set to user, group ownership to the tasktracker
user, 570 permissions).
- The per user cache will be under $ttroot/users/$user/archive
- Owen suggested we can change the jobcache also to be under $ttroot/users/$user/jobcache
as part of this jira. (However, we will not change the direction of MAPREDUCE-842 which is
quite close to the finish line now)
- There'll be symlinks from the task directories to the distributed cache files. 
- The current paging policy which sets a soft limit on the size of the distributed cache on
disk will remain unchanged. We discussed there could be potentially work in the future to
make this a hard limit, which could even have impacts on scheduling in the sense that the
scheduler should schedule tasks to be within the limits). But this is certainly the scope
of another jira.

> Localized files from DistributedCache should have right access-control
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-4493
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4493
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: security
>            Reporter: Arun C Murthy
>


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