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From "Fournier, Camille F." <Camille.Fourn...@gs.com>
Subject RE: Zookeeper on two clusters?
Date Fri, 26 Aug 2011 16:05:57 GMT
As long as the two clusters can ping each other, just set up a single ZK cluster spread across
the two, 3 or 5 nodes (total, not per cluster). Note that if these two clusters are used for
business continuity purposes (spread across 2 data centers), you still risk the outage of
the zookeeper if you lose one of the data centers (the one containing the majority of the
ZK nodes). 

There's no reason to set up 2 ZK quorums and merge them.


-----Original Message-----
From: Aleksey Yakovlev [mailto:aleksey.yakovlev@gmail.com] 
Sent: Friday, August 26, 2011 10:09 AM
To: user@zookeeper.apache.org
Subject: Re: Zookeeper on two clusters?


I need these two clusters to communicate somehow, because our distributed
system works on both of them - so we need some coordination, for example, to
recover after failures. I could create my own servers/protocols for that,
but why - the ZooKeeper does just that, right?

The number 5 isn't important here, configuration and communication is


On Fri, Aug 26, 2011 at 1:55 AM, Mahadev Konar <mahadev@hortonworks.com>wrote:

> Aleksey,
>  I am a little confused. Whats the motivation behind merging the
> quorums? Why do you want 5 on each cluster?
> thanks
> mahadev
> On Tue, Aug 23, 2011 at 10:24 AM, Aleksey Yakovlev
> <aleksey.yakovlev@gmail.com> wrote:
> > Hi,
> >
> > We have two clusters but I can't just ssh from one cluster to another - I
> > have to enter a password, use some authentication, go through a load
> > balancer etc
> > It would be very useful for us to use the Zookeeper as a common storage
> > place for small configuration data, accessible from both these clusters.
> >
> > So, I'm thinking about starting like 5 servers on each cluster and merge
> > them into a single quorum - anybody did that?
> > If yes, how to configure this double-side quorum?
> >
> > (I'm completely new to the Zookeeper)
> >
> > Thanks
> > AY
> >

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