http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html
In several scenarios, you might want to change the default behavior. The key property to change in hdfs-site.xml
fs.permissions.umask-mode = 022 (note there is a bug in Apache that it does not like 4 digit as advertised, so use 3 bits)
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