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

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AvatarNode by FB?
as described in

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?