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
