"hive.files.umask.value" is not work

my "hive-site.xml" contents:
<property>
<name>hive.warehouse.subdir.inherit.perms</name>
<value>false</value>
</property>
<property>
<name>hive.files.umask.value</name>
<value>0077</value>
</property>

but the folder that hive create has permisson 755.

PS: hadoop "core-site.xml" has :
<property>
<name>fs.permissions.umask-mode</name>
<value>077</value>
</property>

and when i create folder using "hdfs dfs -mkdir XXX",the permission of folder is right (700).

so is it a bug ? or i missed something