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From John Sirois <john.sir...@gmail.com>
Subject Re: Managing Watchers
Date Mon, 13 Apr 2015 23:51:40 GMT
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:
http://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection

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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