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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-896) Users can set non-writable permissions on temporary files for TT and can abuse disk usage.
Date Wed, 16 Dec 2009 15:31:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791401#action_12791401
] 

Hemanth Yamijala commented on MAPREDUCE-896:
--------------------------------------------

There are few comments:
- I would suggest we don't check only for existence of workDirs. We should not be calling
the task-controller if a path doesn't exist.
- I would also think that if the task-controller fails to set permissions for some components,
we can still try and delete the rest of the components. So, I would suggest we catch exceptions
from runCommand in LinuxTaskController.
- The modified test case has a comment saying 555 permissions are being set on files, which
is not true. Please adjust that.

> Users can set non-writable permissions on temporary files for TT and can abuse disk usage.
> ------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-896
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-896
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.21.0
>            Reporter: Vinod K V
>            Assignee: Ravi Gummadi
>             Fix For: 0.21.0
>
>         Attachments: MR-896.patch, MR-896.v1.patch, MR-896.v2.patch, y896.v1.patch, y896.v2.1.fix.patch,
y896.v2.1.patch, y896.v2.patch
>
>
> As of now, irrespective of the TaskController in use, TT itself does a full delete on
local files created by itself or job tasks. This step, depending upon TT's umask and the permissions
set by files by the user, for e.g in job-work/task-work or child.tmp directories, may or may
not go through successful completion fully. Thus is left an opportunity for abusing disk space
usage either accidentally or intentionally by TT/users.

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