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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4705) [HOD] Grant read permissions for files/directories created by hod as part of provisioning hadoop clusters
Date Wed, 03 Dec 2008 04:18:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652675#action_12652675
] 

Hemanth Yamijala commented on HADOOP-4705:
------------------------------------------

A few clarifications. The world writable permissions are provided only for the root directory
(hodring.tempdir) so that all users can create sub dirs under them. The user's sub dir is
only world readable, not writable. There is no change to this due to the patch and has existed
always. The history files being world readable is not HOD's doing either. Hadoop standalone
exhibits the same behavior.

On investigation, we found that we weren't consciously setting the permissions to be only
user readable. The resource management system was doing this automatically, and it was not
clear that this was intended. 

If being readable is not good, then the Chukwa team has to figure out how they will access
the data, and we can revert the patch. I will wait for comments from the Chukwa team.

> [HOD] Grant read permissions for files/directories created by hod as part of provisioning
hadoop clusters
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4705
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4705
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/hod
>            Reporter: Hemanth Yamijala
>            Assignee: Hemanth Yamijala
>             Fix For: 0.20.0
>
>         Attachments: hadoop-4705-1.txt, hadoop-4705-2.txt, hadoop-4705-3.txt, hadoop-4705.txt
>
>
> When HOD creates the log, work and temp directories for Hadoop, it creates them with
permissions 0700. This is too restrictive for applications like Chukwa which need access to
files in this directory for generating Hadoop metrics. This is a request to allow read permissions
to other applications.

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