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From Saurabh Dutta <saurabh...@gmail.com>
Subject Re: Zookeeper Coodination Service
Date Thu, 17 Jan 2013 21:20:55 GMT
Thanks. I'm definitely going to try them out.

Appreciate your help.



On Fri, Jan 18, 2013 at 2:42 AM, Asta, Greg <greg.asta@omnigon.com> wrote:

> I don't know how to manipulate VIPs in Java.  In Linux shell scripting
> it'd be something like "ip addr add 192.168.1.1 eth0".  Obviously replace
> the IP address with whatever IP you'd use and the interface with the proper
> NIC.
>
> The inverse (to drop it) would be ip addr del command.  To make this work
> without fussing with the network equipment usually these machines need to
> be on the same switch I believe.
>
> -Greg
>
> -----Original Message-----
> From: Saurabh Dutta [mailto:saurabh113@gmail.com]
> Sent: Thursday, January 17, 2013 3:46 PM
> To: user@zookeeper.apache.org
> Subject: Re: Zookeeper Coodination Service
>
> Thanks Edward and Greg.
>
> Can you help me with a small java code snippet to achieve the same?
>
> Thanks
>
> On Thu, Jan 17, 2013 at 10:43 PM, Asta, Greg <greg.asta@omnigon.com>
> wrote:
>
> > Yeah, we achieved something similar using a simple "VIP".  Once the
> > leader election switches, the new leader can activate the VIP, while
> > the old one deactivates it.  DNS with a very short TTL is another way to
> achieve this.
> >
> > -Greg
> >
> > -----Original Message-----
> > From: Edward Ribeiro [mailto:edward.ribeiro@gmail.com]
> > Sent: Thursday, January 17, 2013 12:06 PM
> > To: user@zookeeper.apache.org
> > Subject: Re: Zookeeper Coodination Service
> >
> > Yes, what you have just described is a sweet spot for Zookeeper.
> >
> > Based on your description, you want one of the servers as the leader
> > and while having  the others waiting. Take a look at "Leader Election
> Recipe"
> > in ZK Tutorials for how to implement this. If the leader goes offline
> > then the other machines use ZK to run the election procedure and elect
> > a new leader to serve requests. Of course, you will also need a
> > "router" service that also listens to ZK so that it can redirect the
> > requests to the right machine.
> >
> > Edward
> >
> > On Thu, Jan 17, 2013 at 2:02 PM, Saurabh Dutta <saurabh113@gmail.com>
> > wrote:
> >
> > > Hi,
> > >
> > > I've a a simple tcp service which will listen on a port for incoming
> > > requests from client. I'd like to have this same service run on
> > > multiple servers in a failsafe manner.
> > >
> > > There will be a client which will initially write to server1 and if
> > > it goes down i want the requests to be directed to server2.
> > >
> > > I'm tyring to write a a zookeeper coordinator which will keep my
> > > services up and if one service goes down i want the other service to
> > > take over and replace it.
> > >
> > > Please help me to explore if this can be done through zookeeper and
> > > if yes how this can be achieved.
> > >
> > > Thanks,
> > > Saurabh
> > >
> >
> > -----
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> > Version: 2012.0.2221 / Virus Database: 2638/5539 - Release Date:
> > 01/17/13
> >
>
> -----
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> Checked by AVG - www.avg.com
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