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Posted to hdfs-dev@hadoop.apache.org by John Hui <jo...@gmail.com> on 2010/09/13 23:33:34 UTC

namenode crash - recovery model?

Hi All,

I am new to Hadoop.  I have been reading and playing around with Hadoop, it
seems like the namenode is a single point of failure.  I read about the
backup node which is basically a copy of the live namenode.

So if the namenode were to crash, what is some of the recovery model that
people have in place.  Is there a way to configure hadoop to flip the the
backup node and use that as the primary name node if the primary namenode
goes down..

Thanks in advance,

John

Re: namenode crash - recovery model?

Posted by Jinsong Hu <ji...@hotmail.com>.
use linux heartbeat project and DRBD to build a backup namenode.

Jimmy

--------------------------------------------------
From: "John Hui" <jo...@gmail.com>
Sent: Monday, September 13, 2010 2:33 PM
To: <hd...@hadoop.apache.org>
Subject: namenode crash - recovery model?

> Hi All,
>
> I am new to Hadoop.  I have been reading and playing around with Hadoop, 
> it
> seems like the namenode is a single point of failure.  I read about the
> backup node which is basically a copy of the live namenode.
>
> So if the namenode were to crash, what is some of the recovery model that
> people have in place.  Is there a way to configure hadoop to flip the the
> backup node and use that as the primary name node if the primary namenode
> goes down..
>
> Thanks in advance,
>
> John
>

Re: namenode crash - recovery model?

Posted by Jeff Hammerbacher <ha...@cloudera.com>.
Hey John,

See https://issues.apache.org/jira/browse/HDFS-1064 for the JIRA where high
availability strategies for the NameNode are discussed.

Thanks,
Jeff

On Mon, Sep 13, 2010 at 2:33 PM, John Hui <jo...@gmail.com> wrote:

> Hi All,
>
> I am new to Hadoop.  I have been reading and playing around with Hadoop, it
> seems like the namenode is a single point of failure.  I read about the
> backup node which is basically a copy of the live namenode.
>
> So if the namenode were to crash, what is some of the recovery model that
> people have in place.  Is there a way to configure hadoop to flip the the
> backup node and use that as the primary name node if the primary namenode
> goes down..
>
> Thanks in advance,
>
> John
>