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From Arun C Murthy <...@yahoo-inc.com>
Subject Re: How does hadoop uses ssh
Date Tue, 16 Nov 2010 18:15:02 GMT

On Nov 16, 2010, at 10:04 AM, rahul wrote:

> Hi,
> I have one question regarding the use of password less ssh login by  
> the hadoop user across the hosts.
> I want to understand when hadoop does password less ssh, is it once  
> or can happen any time and is there a defined way to track that.
> As this raises security concerns how to deal with it ?
> Hadoop itself does not use SSH keys other then for this startup is  
> this statement true ?

ssh is used only by the helper scripts to start the daemons (DataNodes  
and TaskTrackers). The Hadoop software framework by itself doesn't use  


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