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From George Datskos <george.dats...@jp.fujitsu.com>
Subject Re: Adding nodes
Date Fri, 02 Mar 2012 01:58:52 GMT

New datanodes will connect to the namenode so thats how the namenode 
knows.  Just make sure the datanodes have the correct {fs.default.dir} 
in their hdfs-site.xml and then start them.  The namenode can, however, 
choose to reject the datanode if you are using the {dfs.hosts} and 
{dfs.hosts.exclude} settings in the namenode's hdfs-site.xml.

The namenode doesn't actually care about the slaves file.  It's only 
used by the start/stop scripts.

On 2012/03/02 10:35, Mohit Anchlia wrote:
> I actually meant to ask how does namenode/jobtracker know there is a new
> node in the cluster. Is it initiated by namenode when slave file is edited?
> Or is it initiated by tasktracker when tasktracker is started?

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