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From Robert Dyer <psyb...@gmail.com>
Subject Re: Specific HDFS tasks where is passwordless SSH is necessary
Date Tue, 05 Feb 2013 23:37:14 GMT
The JobTracker will also SSH in to start TaskTracker's.

So basically, the masters need SSH to any slave(s) you define.  The slave
nodes (DN, TT) do not need SSH to each other.


On Tue, Feb 5, 2013 at 5:06 PM, Jay Vyas <jayunit100@gmail.com> wrote:

> When setting up passwordless ssh on a cluster, its clear that the namenode
> needs to be able to ssh into task trackers to start/stop nodes and restart
> the cluster.
>
> What else is passwordless SSH used for?  Do TaskTrackers/DataNodes ever
> SSH into each other horizontally ? Or is SSH only used for one-way nn to tt
> operations?
>
> --
> Jay Vyas
> http://jayunit100.blogspot.com
>
> --
>
> Robert Dyer
> rdyer@iastate.edu
>

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