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Date: Thu, 1 Nov 2012 08:17:04 -0700
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 <CAH0yS3KbteRVGn8+ZM0_fmg=D19raRhcdOHi2NkgwKz4uR=AQg@mail.gmail.com>
Subject: Re: High bandwidth usage between datacenters for cluster
From: "B. Todd Burruss" <btoddb@gmail.com>
To: user@cassandra.apache.org
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bryce, did you resolve this?  i'm interested in the outcome.

when you write does it help to use CL =3D LOCAL_QUORUM?

On Mon, Oct 29, 2012 at 12:52 AM, aaron morton <aaron@thelastpickle.com> wr=
ote:
> Outbound messages for other DC's are grouped and a single instance is sen=
t
> to a single node in the remote DC. The remote node then forwards the mess=
age
> on to the other recipients in it's DC. All remote DC nodes will however
> reply directly to the coordinator.
>
> Normally this isn=92t an issue for us, but at times we are writing
> approximately 1MB a sec of data, and seeing a corresponding 3MB of traffi=
c
> across the WAN to all the Cassandra DR servers.
>
> Can you break the traffic down by port and direction ?
>
> Cheers
>
>
>
> -----------------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 28/10/2012, at 12:18 PM, Bryce Godfrey <Bryce.Godfrey@azaleos.com> wro=
te:
>
> Network topology with the topology file filled out is already the
> configuration we are using.
>
> From: sankalp kohli [mailto:kohlisankalp@gmail.com]
> Sent: Thursday, October 25, 2012 11:55 AM
> To: user@cassandra.apache.org
> Subject: Re: High bandwidth usage between datacenters for cluster
>
> Use placement_strategy =3D
> 'org.apache.cassandra.locator.NetworkTopologyStrategy' and also fill the
> topology.properties file. This will tell cassandra that you have two DCs.
> You can verify that by looking at output of the ring command.
>
> If you DCs are setup properly, only one request will go over WAN. Though =
the
> responses from all nodes in other DC will go over WAN.
>
> On Thu, Oct 25, 2012 at 10:44 AM, Bryce Godfrey <Bryce.Godfrey@azaleos.co=
m>
> wrote:
>
> We have a 5 node cluster, with a matching 5 nodes for DR in another data
> center.   With a replication factor of 3, does the node I send a write to=
o
> attempt to send it to the 3 servers in the DR also?  Or does it send it t=
o 1
> and let it replicate locally in the DR environment to save bandwidth acro=
ss
> the WAN?
> Normally this isn=92t an issue for us, but at times we are writing
> approximately 1MB a sec of data, and seeing a corresponding 3MB of traffi=
c
> across the WAN to all the Cassandra DR servers.
>
> If my assumptions are right, is this configurable somehow for writing to =
one
> node and letting it do local replication?  We are on 1.1.5
>
> Thanks
>
>