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From Zsolt Beothy-Elo <zbeothy-...@talend.com>
Subject Re: Question about Clustered Setup in two data centers
Date Thu, 03 Mar 2011 15:57:25 GMT
Not sure customer will accept to deploy an infrastructure service to EC2 (or any other hosting
service), but it's worth mentioning it. Still there will be questions about realibility, response
times, firewalls, etc.... Anyway, thx for the quick answers on this mailing list. As soon
as we have relased our product I will add it to the PoweredBy page in the wiki.


Am 02.03.2011 um 23:57 schrieb Ted Dunning:

A variant is to keep the tie-breaker in EC2.  That can be made fairly secure, especially if
all you are hosting is status information.

On Wed, Mar 2, 2011 at 2:51 PM, Zsolt Beothy-Elo <zbeothy-elo@talend.com<mailto:zbeothy-elo@talend.com>>

Am 02.03.2011 um 18:56 schrieb Jesse Kempf:

> Hi Zsolt,
> If the customer has a computer room at their headquarters, you could keep two ZKs in
each datacenter and a fifth ZK at their HQ. In that case you could lose a datacenter and still
have quorum.

Running such an infrastructure service outside one of the data centers of course violates
almost every policy (security, backup,...) that is in place at the customer.  But we also
had the idea :) And as Ritesh states computer at headquarter would likely become the bottleneck.
Connection between centers is fast and reliable under almost all circumstances.


> Cheers,
> -Jesse
> On Mar 2, 2011, at 2:57 PM, Zsolt Beothy-Elo 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
>> Cheers,
>> Zsolt Beothy-Elo

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