[jira] Updated: (MAPREDUCE-896) Users can set non-writable permissions on temporary files for TT and can abuse disk usage.

["Vinod K V (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod K V updated MAPREDUCE-896:
--------------------------------

    Affects Version/s: 0.21.0
        Fix Version/s: 0.21.0

With LinuxTaskController in use, we have seen instances of this on some clusters. This effectively rendered some of the TTs useless for lack of disk space. Need in this 0.21.

> 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
>
>
> 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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