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From "Ahmed Radwan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2289) Permissions race can make getStagingDir fail on local filesystem
Date Mon, 11 Jun 2012 18:57:21 GMT

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

Ahmed Radwan updated MAPREDUCE-2289:
------------------------------------

    Status: Patch Available  (was: Open)
    
> 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: Todd Lipcon
>             Fix For: 0.22.1
>
>         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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