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From Vikrant Singh <vikr...@yahoo-inc.com.INVALID>
Subject Re: Managing Watchers
Date Tue, 14 Apr 2015 13:07:31 GMT
Thank you all for feedback. I think I understand your advise and will use leader election to
solve this problem.ThanksVikrant 

     On Monday, 13 April 2015 4:55 PM, John Sirois <john.sirois@gmail.com> wrote:

 On Mon, Apr 13, 2015 at 5:36 PM, Vikrant Singh <
vikrant@yahoo-inc.com.invalid> wrote:

> Hello zookeeper users,I am experimenting/prototyping a zookeeper
> installation.One part of the same is a watchClient which monitor various
> znodes (by applying watches) and perform some action according to triggered
> watch.
> As part of plan we need to have multiple instances of this watchClient
> running against same set of nodes. Idea is to have one client taking all
> the load, while other is on standby mode.This is done primarily to make
> sure that there is a backup capacity. If primary process dies, other
> process (on standby) takes over the load.

The key phrase you're looking for is "leader election".  A recipe for that
is here:

Question I wanted to ask is that is there any zookeeper recipe or framework
> which gives us this functionality? I wanted to use something existing which
> is will proven/tested before choosing to write from scratch.
> Thanks,Vikrant

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