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From Daning Wang <>
Subject Re: Cassandra multi-datacenter
Date Fri, 03 May 2013 17:25:01 GMT
Thanks Jabbar and Aaron.

Aaron - for broadcast_address , looks it is only working with
but in our case, we will have one center in colo, and one center in
ec2(sorry, did not make that clear, we'd like to replicate data from colo
to EC2)

So can we still use broadcast_address? or other solutions? Is that easy to
write a new Snitch for this?



On Thu, May 2, 2013 at 2:31 PM, aaron morton <>wrote:

> Look at the broadcast_address in the yaml file
> Cheers
> -----------------
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
> @aaronmorton
> On 3/05/2013, at 9:10 AM, Jabbar Azam <> wrote:
> I'm not sure why you want to use public Ip's in the other data centre.
> You're cassandra nodes in the other datacentre will be accessible from the
> internet
> Personally I would use private IP addresses in the second data centre, on
> a different IP subnet.
> A VPN is your only solution if you want to keep your data private and
> unhackable, as it's tunneling it's way through the internet
> A slow network connection will mean your data is not in sync in both
> datacentres unless you explicitly specify quorum as your consisteny level
> in your mutation requests but your database throughput will be affected by
> this.
> You bandwidth to the second datacentre and the quantity of your mutation
> requests will dictate how long it will take the second datacentre to get in
> sync with the primary datacentre.
> I've probably missed something but there are plenty of intelligent people
> in this mailing list to fill the blanks :)
> Thanks
> Jabbar Azam
> On 2 May 2013 20:28, Daning Wang <> wrote:
>> Hi all,
>> We are deploying Cassandra on two data centers. there is slower network
>> connection between data centers.
>> Looks casandra should use internal ip to communicate with nodes in the
>> same data center, and public ip to talk to nodes in other data center. We
>> know VPN is a solution, but want to know if there is other idea.
>> Thanks in advance,
>> Daning

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