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From Dmytro Molkov <...@facebook.com>
Subject Re: Avatar Datanodes
Date Tue, 10 Aug 2010 03:07:38 GMT
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 <ra078686@students.ic.unicamp.br> wrote:

> Hi all,
> 
> I was studying the code of HDFS-976 and Dhruba's overview about Avatar Nodes
> (
> http://hadoopblog.blogspot.com/2010/02/hadoop-namenode-high-availability.html)
> 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

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