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From Azuryy Yu <azury...@gmail.com>
Subject RE: For a new installation: use the BackupNode or the CheckPointNode?
Date Wed, 27 Mar 2013 04:47:57 GMT
yes,you got it. hadoop1.0.x cannot failover auto or mannual. you have to
copy fsimage from SNN to the primary NN.
On Mar 27, 2013 11:29 AM, "David Parks" <davidparks21@yahoo.com> wrote:

> Thanks for the update, I understand now that I'll be installing a
> "secondary
> name node" which performs checkpoints on the primary name node and keeps a
> working backup copy of the fsimage file.
>
> The primary name node should write its fsimage file to at least 2 different
> physical mediums for improved safety as well (example: locally and an nfs
> share).
>
> One point of query: were the primary name node to be lost, we would be best
> off re-building it and copying the fsimage files into place, either from
> the
> nfs share, or from the secondary name node, as the situation dictates.
> There's no mechanism to "fail over" to the "secondary name node" per-se.
>
> Am I on track here?
>
> Thanks!
> David
>
>
> -----Original Message-----
> From: Konstantin Shvachko [mailto:shv.hadoop@gmail.com]
> Sent: Wednesday, March 27, 2013 5:07 AM
> To: user@hadoop.apache.org
> Cc: davidparks21@yahoo.com
> Subject: Re: For a new installation: use the BackupNode or the
> CheckPointNode?
>
> There is no BackupNode in Hadoop 1.
> That was a bug in documentation.
>
> Here is the updated link:
> http://hadoop.apache.org/docs/r1.1.2/hdfs_user_guide.html
>
> Thanks,
> --Konstantin
>
> On Sat, Mar 23, 2013 at 12:04 AM, varun kumar <varun.uid@gmail.com> wrote:
> > Hope below link will be useful..
> >
> > http://hadoop.apache.org/docs/stable/hdfs_user_guide.html
> >
> >
> > On Sat, Mar 23, 2013 at 12:29 PM, David Parks <davidparks21@yahoo.com>
> > wrote:
> >>
> >> For a new installation of the current stable build (1.1.2 ), is there
> >> any reason to use the CheckPointNode over the BackupNode?
> >>
> >>
> >>
> >> It seems that we need to choose one or the other, and from the docs
> >> it seems like the BackupNode is more efficient in its processes.
> >
> >
> >
> >
> > --
> > Regards,
> > Varun Kumar.P
>
>

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