hadoop-mapreduce-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Harsh J <ha...@cloudera.com>
Subject Re: namenode recovery
Date Wed, 25 Mar 2015 22:22:56 GMT
Not automatically. You'd need to copy over the VERSION and fsimage* files
from your SecondaryNN's checkpoint directory over to the new NameNode's
configured name directory to start it back up with the checkpointed data.

On Wed, Mar 25, 2015 at 5:40 PM, Brian Jeltema <
brian.jeltema@digitalenvoy.net> wrote:

> I have a question about a recovery scenario for Hadoop 2.4.
>
> I have a small development cluster, no HA configured, that was taken down
> cleanly,
> that is, all services were stopped (via Ambari) and all the nodes were
> then rebooted.
> However, the reboot of the namenode system failed; that system is
> completely dead.
> The only HDFS service running on the system was the namenode; the
> secondary namenode
> was running elsewhere and came back, as well as all of the datanodes.
>
> In this scenario, can I just start a namenode on one of the other nodes?
> Will it recover
> the fsimage that was checkpointed by the secondary namenode?
>
> Thanks
> Brian




-- 
Harsh J

Mime
View raw message