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https://issues.apache.org/jira/browse/HADOOP-2543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558756#action_12558756
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Hairong Kuang commented on HADOOP-2543:
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a) and c) have already been implemented in HADOOP-1298. I will work on b). In
addition, I'd like to make some change to the upgrade.
1) all files and directories will be owned by the super user and super group;
2) the permission of the files is set to be 0600 and the permission of the
directories is set to be 0700.
These changes make sure that files/directories won't be accessed by illegal
users even when an administrator forget to change their permissions when
permission checking is turned on.
> No-permission-checking mode for smooth transition to 0.16's permissions
> features.
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-2543
> URL: https://issues.apache.org/jira/browse/HADOOP-2543
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs
> Affects Versions: 0.15.1
> Reporter: Sanjay Radia
> Assignee: Hairong Kuang
> Fix For: 0.16.0
>
>
> In moving to 0.16, which will support permissions, a mode of no-permission
> checking has been proposed to allow smooth transition to using the new
> permissions feature.
> The idea is that at first 0.16 will be used for a period of time with
> permission checking off.
> Later after the admin has changed ownership and permissions of various files,
> the permission checking can be turned off.
> This Jira defines what the semantics are of the no-permission-checking mode.
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