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From "Michael Di Domenico" <mdidomeni...@gmail.com>
Subject Re: Hadoop installation folders in multiple nodes
Date Mon, 02 Jun 2008 19:23:06 GMT
Depending on your windows version, there is a dos command called "subst"
which you could use to virtualize a drive letter on your third machine

On Fri, May 30, 2008 at 4:35 AM, Sridhar Raman <sridhar.raman@gmail.com>
wrote:

> Should the installation paths be the same in all the nodes?  Most
> documentation seems to suggest that it is _*recommended*_ to have the
> _*same
> *_ paths in all the nodes.  But what is the workaround, if, because of some
> reason, one isn't able to have the same path?
>
> That's the problem we are facing right now.  After making Hadoop work
> perfectly in a 2-node cluster, when we tried to accommodate a 3rd machine,
> we realised that this machine doesn't have a E:, which is where the
> installation of hadoop is in the other 2 nodes.  All our machines are
> Windows machines.  The possible solutions are:
> 1) Move the installations in M1 & M2 to a drive that is present in M3.  We
> will keep this as the last option.
> 2) Map a folder in M3's D: to E:.  We used the "subst" command to do this.
> But when we tried to start DFS, it wasn't able to find the hadoop
> installation.  Just to verify, we tried a ssh to the localhost, and were
> unable to find the mapped drive.  It's only visible as a folder of D:.
> Whereas, in the basic cygwin prompt, we are able to view E:.
> 3) Partition M3's D drive and create an E.  This carries the risk of loss
> of
> data.
>
> So, what should we do?  Is there any way we can specify in the NameNode the
> installation paths of hadoop in each of the remaining nodes?  Or is there
> some environment variable that can be set, which can make the hadoop
> installation path specific to each machine?
>
> Thanks,
> Sridhar
>

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