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From: Zsolt Beothy-Elo <zbeothy-elo@talend.com>
To: "user@zookeeper.apache.org" <user@zookeeper.apache.org>
Date: Wed, 2 Mar 2011 23:51:31 +0100
Subject: Re: Question about Clustered Setup in two data centers 
Thread-Topic: Question about Clustered Setup in two data centers 
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Am 02.03.2011 um 18:56 schrieb Jesse Kempf:

> Hi Zsolt,
>=20
> 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 co=
uld lose a datacenter and still have quorum.

Running such an infrastructure service outside one of the data centers of c=
ourse 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 cent=
ers is fast and reliable under almost all circumstances. =20

Zsolt

>=20
> Cheers,
> -Jesse
>=20
> On Mar 2, 2011, at 2:57 PM, Zsolt Beothy-Elo wrote:
>=20
>> Hi all,
>> in our product we currently implement to use ZooKeeper in conjunction wi=
th CXF to dynamically manage available services and endpoints. Unfortunatel=
y one of our customers is not very happy of having to run a minimum of thre=
e 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 tw=
o  instances one in each data center. I would be grateful for some advise h=
ow to best cope with these contradicting requirements.
>>=20
>> Cheers,
>> Zsolt Beothy-Elo
>=20