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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: Question about Clustered Setup in two data centers
Date Wed, 02 Mar 2011 18:40:39 GMT
What is being coordinated with ZK?

What level of reliability is required?  What fail-over time?  What failure
modes are acceptable?

How will clients coming into the load balancer at one datacenter be
redirected to the other?

In my experience, reliability means many things.  In one application I
worked on, full triplication of the data-centers was required and all
transactions were sent to all three.  Behind the scenes lots of gnomes
worked to keep things consistent, but the client always got a full speed
response no matter what.

Other situations have required <1 day recovery with no loss of data.

Presumably your needs are between these cases.

On Wed, Mar 2, 2011 at 6:57 AM, Zsolt Beothy-Elo <zbeothy-elo@talend.com>wrote:

> Hi all,
> in our product we currently implement to use ZooKeeper in conjunction with
> CXF to dynamically manage available services and endpoints. Unfortunately
> one of our customers is not very happy of having to run a minimum of three
> ZooKeeper server instances to ensure fail over. The customer has two data
> centers in different locations where data and applications are replicated
> and some big-ip appliance in front of the data centers. If one data center
> fails everything must still be operable. So he would prefer to only have two
>  instances one in each data center. I would be grateful for some advise how
> to best cope with these contradicting requirements.
> Cheers,
> Zsolt Beothy-Elo

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