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https://issues.apache.org/jira/browse/HADOOP-2552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557034#action_12557034
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Raghu Angadi commented on HADOOP-2552:
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+1. Better to iron out issues earlier than later.
> enable hdfs permission checking by default
> ------------------------------------------
>
> Key: HADOOP-2552
> URL: https://issues.apache.org/jira/browse/HADOOP-2552
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Reporter: Doug Cutting
> Fix For: 0.16.0
>
>
> We should enable permission checking in dfs by default. Currently, on
> upgrade, all file permissions are 777, so this is a back-compatible change.
> After an upgrade folks can change owners and groups and limit permissions,
> and things will work as expected.
> The current default, dfs.permissions=false, gives inconsistent behaviour:
> permissions are displayed in 'ls' and returned by the FileSystem APIs, but
> they're not enforced. In future releases we will certainly want
> dfs.permissions=true to be the default, and making it so now will thus also
> avoid an incompatible change.
> dfs.permissions=false should be an optional, non-default configuration that
> some sites may decide to use. It is further defined in HADOOP-2543.
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