HDFS Access Control Lists (ACLs) not supported

[alekratz]

When ACLs are applied to a file or directory, they become unusable in the mounted environment.

[alek@hadoop alek]$ touch testacls
[alek@hadoop alek]$ ls -l
total 0
-rw-rw-r--. 0 alek hdfs 0 Jun 12 12:15 testacls
[alek@hadoop alek]$ hdfs dfs -setfacl -m user:sina:rwx /user/alek/testacls
[alek@hadoop alek]$ ls -l
ls: cannot access testacls: Input/output error
total 0
??????????? ? ?    ?    ?            ? testacls

I haven't looked too in depth to see if this would be an easy thing to support or not.