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Hadoop >> mail # user >> AvatarNode by FB?


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AvatarNode by FB?
as described in
http://www.google.com/url?sa=t&source=web&cd=1&ved=0CBgQFjAA&url=http%3A%2F%2Fhadoopblog.blogspot.com%2F2010%2F02%2Fhadoop-namenode-high-availability.html&ei=D4MkTsCrI8TRiALN4-mvAw&usg=AFQjCNFTIAn6ETjAxlC6s5u33sjTUARZQw&sig2=yIka9cpvn9qHvve95niefA

and in the recent FB paper, AvatarNode is a different solution as the
BackUpNode/CheckpointNode feature, right?
-----since the link above says: "The HDFS BackupNode is not available
in 0.20, and upgrading our cluster to hadoop 0.20 is not a feasible
option for us because .... ".

if they are different, is the FB AvatarNode feature is open-sourced ?
if so, is it a better or worse solution than the current
BackUpNode/CheckpointNode in apache distribution?

Thanks
yang