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https://issues.apache.org/jira/browse/HADOOP-10246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881474#comment-13881474
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Colin Patrick McCabe commented on HADOOP-10246:
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I agree that we should have more tests for this. However, the current behavior
seems correct to me. It's modelled closely on the traditional POSIX behavior,
where {{mkdir}} honors {{umask}}, but {{chmod}} does not. Anything else would
be surprising for users coming from traditional filesystems.
Another reason for the current behavior is that if {{chmod}} consulted
{{umask}}, there would be no way for users to set less restrictive permissions
than specified in {{umask}}. This is contrary to the purpose of {{umask}},
which is just to be a helpful default, not a hard constraint.
> define FS permissions model with tests
> --------------------------------------
>
> Key: HADOOP-10246
> URL: https://issues.apache.org/jira/browse/HADOOP-10246
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Reporter: Steve Loughran
> Priority: Minor
>
> It's interesting that HDFS mkdirs(dir, permission) uses the umask, but
> setPermissions() does not
> The permissions model, including umask logic should be defined and have tests
> implemented by those filesystems that support permissions-based security
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