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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1435) symlinks in cwd of the task are not handled properly after MAPREDUCE-896
Date Wed, 03 Mar 2010 08:13:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840524#action_12840524

Ravi Gummadi commented on MAPREDUCE-1435:

Would it be better if we check if the owner and group of public distributed cache files are
correct also ?

Once we add that also to the checks of public distributed cache files, then ClusterWithLinuxTaskController.checkPermissionsOnDir()
can be reused for these checks also and can avoid TestTrackerDistributedCacheManager.checkPublicFilePermissions()

> symlinks in cwd of the task are not handled properly after MAPREDUCE-896
> ------------------------------------------------------------------------
>                 Key: MAPREDUCE-1435
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1435
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.22.0
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Ravi Gummadi
>             Fix For: 0.22.0
>         Attachments: 1435.patch, 1435.v1.patch, 1435.v2.patch, 1435.v3.patch, MR-1435-y20s.patch
> With JVM reuse, TaskRunner.setupWorkDir() lists the contents of workDir and does a fs.delete
on each path listed. If the listed file is a symlink to directory, it will delete the contents
of those linked directories. This would delete files from distributed cache and jars directory,if
mapred.create.symlink is true.
> Changing ownership/permissions of symlinks through ENABLE_TASK_FOR_CLEANUP would change
ownership/permissions of underlying files.
> This is observed by Karam while running streaming jobs with DistributedCache and jvm

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