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From Bejoy Ks <bejoy.had...@gmail.com>
Subject Re: Hadoop Namenode Failover
Date Thu, 22 Mar 2012 14:36:32 GMT
Hi Tibi
      To recover from a Name Node failure, the following are
the suggested approaches as of now

- Maintain a SNN which does periodic check pointing
*
http://hadoop.apache.org/common/docs/current/hdfs_user_guide.html#Secondary+NameNode
*
- Make sure you configure a remote NFS mount, so you have a remote copy of
fs image on another server even if you fully lose out the running NN

There is some awesome work going on for HA within hadoop project itself,
for details
*https://issues.apache.org/jira/browse/HDFS-1623*

Regards
Bejoy KS

On Thu, Mar 22, 2012 at 7:56 PM, Tibor Korocz <tkorocz@gmail.com> wrote:

> Hi,
>
> I am new in Hadoop. I created a four nodes cluster 3 slaves, and 1 master
> (this is onyl the test system).
> It works fine, i used this howto:
> http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/.
> My question is, what is the best solution to make the master(namenode)
> fail over, i read a lot, but i dont now what is the best.
> I found this howto:
> http://www.cloudera.com/blog/2009/07/hadoop-ha-configuration/ , but if it
> is possible, i do not want to use DRBD.
> I hope somebody can help me. Sorry my english.... :)
>
> Thanks.
> Tibi
>

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