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Date: Mon, 2 Jun 2008 15:24:31 -0400
From: "Michael Di Domenico" <mdidomenico4@gmail.com>
To: core-user@hadoop.apache.org
Subject: Re: Hadoop installation folders in multiple nodes
Cc: hadoop-user@lucene.apache.org
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Oops, missed the part where you already tried that.

On Mon, Jun 2, 2008 at 3:23 PM, Michael Di Domenico <mdidomenico4@gmail.com>
wrote:

> 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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