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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (MAPREDUCE-2289) Permissions race can make getStagingDir fail on local filesystem
Date Thu, 11 Oct 2012 17:49:54 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy closed MAPREDUCE-2289.
------------------------------------

    
> Permissions race can make getStagingDir fail on local filesystem
> ----------------------------------------------------------------
>
>                 Key: MAPREDUCE-2289
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2289
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: job submission
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Ahmed Radwan
>             Fix For: 0.23.3, 2.0.2-alpha
>
>         Attachments: MAPREDUCE-2289_branch-1.0.patch, MAPREDUCE-2289_trunk.patch, mapreduce-2289.txt
>
>
> I've observed the following race condition in TestFairSchedulerSystem which uses a MiniMRCluster
on top of RawLocalFileSystem:
> - two threads call getStagingDir at the same time
> - Thread A checks fs.exists(stagingArea) and sees false
> -- Calls mkdirs(stagingArea, JOB_DIR_PERMISSIONS)
> --- mkdirs calls the Java mkdir API which makes the file with umask-based permissions
> - Thread B runs, checks fs.exists(stagingArea) and sees true
> -- checks permissions, sees the default permissions, and throws IOE
> - Thread A resumes and sets correct permissions

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