On Thu, 2007-10-04 at 10:07 +0330, Mehdi Sheikhalishahi wrote:
> Hello,
>  Is there any documentation about HOD?
> 

You can refer to https://issues.apache.org/jira/browse/HADOOP-1301
for some information about a work-in-progress version of HOD, 
along with some documentation. Let me know if that suffices for you.

Thanks
Hemanth