No, only the "active" namenode sends commands back to the datanodes in avatar node setup.
On Aug 9, 2010, at 5:05 PM, André Oriani <[EMAIL PROTECTED]> wrote:
> Hi all,
> I was studying the code of HDFS-976 and Dhruba's overview about Avatar Nodes
> when some questions came to my mind. If I understood correctly, avatar
> datanodes send heartbeats, block reports and block received messages to both
> avatar namenodes. Does both avatar namenodes send DataCommands back ? If so,
> how contradictory commands are avoided? What would be the impact of
> forwarding messages to a third, fourth,... namenode ?
> Thanks and Regards,
> André Oriani