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From Ted Dunning <tdunn...@veoh.com>
Subject Re: NameNode failover procedure
Date Fri, 20 Jul 2007 17:07:18 GMT

This is now on the wiki under NameNodeFailover and linked from the main

There are some questions unanswered on that page, however.  Could somebody
who actually knows the answers (unlike me) edit that page to fill it out a

On 7/20/07 9:53 AM, "Doug Cutting" <cutting@apache.org> wrote:

>> So far I learned that the secondary namenode keeps refreshing
>> periodically its backup copies of fsimage and editlog files, and if the
>> primary namenode disappears, it's the responsibility of the cluster
>> admin to notice this, shut down the cluster, switch the configs across
>> the cluster to point to the secondary namenode, start a primary namenode
>> on the secondary namenode's host, and restart the rest of the daemons.
> If you use DNS to switch the namenode from the primary to the secondary,
> then no configuration changes or other daemon restarts are required.  I
> think that is the best practice.

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