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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1435) symlinks in cwd of the task are not handled properly after MAPREDUCE-896
Date Sat, 06 Feb 2010 09:56:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830500#action_12830500
] 

Hemanth Yamijala commented on MAPREDUCE-1435:
---------------------------------------------

A few minor nits:

- Typo: contets in comments of ClusterWithLinuxTaskController.
- checkPermissionsOnPrivateDistCache: Do we expect at least one of the directories to have
the file. If yes, we should check for that; otherwise we will mask errors. Similarly for checkPermissionsOnPublicDistCache
- checkPublicFilePermissions seems to be verifying permissions only for others. Should we
also check permissions for owner and group ?
- Comments in createSubDirsAndSymLinks should be dir1/subDir, dir1/file
- Do we need DefaultTaskController.enableTaskForCleanup to give rwx access to group ? Setting
the permissions for user should be sufficient, I think.


> 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
>
>
> 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
reuse.

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