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From "Camilo Gonzalez" <camig...@gmail.com>
Subject Re: Slaves "Hot-Swaping"
Date Tue, 02 Sep 2008 16:51:50 GMT
Great! I will give it a try.

Thanks for your email.

On Tue, Sep 2, 2008 at 10:58 AM, Mikhail Yakshin

> On Tue, Sep 2, 2008 at 7:33 PM, Camilo Gonzalez wrote:
> > I was wondering if there is a way to "Hot-Swap" Slave machines, for
> example,
> > in case an Slave machine fails while the Cluster is running and I want to
> > mount a new Slave machine to replace the old one, is there a way to tell
> the
> > Master that a new Slave machine is Online without having to stop and
> start
> > again the Cluster?
> You don't have to restart entire cluster, you just have to run
> datanode (DFS support) and/or tasktracker processes on fresh node. You
> can do it using hadoop-daemon.sh, commands are "start datanode" and
> "start tasktracker" respectively. There's no need for "hot swapping"
> and "replacing" old slave machines with new ones pretending to be old
> ones. You just plug new one in with new IP/hostname and it will
> eventually start to do tasks as all other nodes.
> You don't really need any "hot standby" or any other high-availability
> schemes. You just plug all possible slaves in and it will balance
> everything out.
> --
> WBR, Mikhail Yakshin

Camilo A. Gonzalez
Ing. de Sistemas
Tel: 300 657 96 96

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