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From Prashant <prashan...@imaginea.com>
Subject Re: AvatarNode by FB?
Date Mon, 25 Jul 2011 06:44:27 GMT
On 07/19/2011 12:35 AM, Yang wrote:
> 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
>
I think in current trunk version MR-279 branch hadoop has incorporated 
HA for namenode using the Zookeeper service. I think that is a better 
technique than Avatarnode's. I hope somebody can through light on this.

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