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https://issues.apache.org/jira/browse/HDFS-2427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125432#comment-13125432
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Tsz Wo (Nicholas), SZE commented on HDFS-2427:
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> ... When i manually create the dir using bin/hadoop dfs -mkdir hdfs:// or 
> webhdfs:// paths it gets 755 permission

This is because of umask.

For the REST interface, there is no way to get client umask in the NameNode 
side so that FsPermission.getDefault(), which returns 777, is used.
                
> webhdfs mkdirs api call creates path with 777 permission, we should default 
> it to 755
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-2427
>                 URL: https://issues.apache.org/jira/browse/HDFS-2427
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.20.205.0
>            Reporter: Arpit Gupta
>


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