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From Harsh J <ha...@cloudera.com>
Subject Re: Specific HDFS tasks where is passwordless SSH is necessary
Date Tue, 05 Feb 2013 23:55:32 GMT
It isn't the NN that does the SSH technically, its the scripts we ship
for an easier start/stop:
http://wiki.apache.org/hadoop/FAQ#Does_Hadoop_require_SSH.3F

So wherever you launch the script, the SSH may happen from that point.

On Wed, Feb 6, 2013 at 4:36 AM, 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



-- 
Harsh J

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