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From Jahangir Mohammed <md.jahangi...@gmail.com>
Subject Re: DataCenters each with their own local data source
Date Wed, 23 Nov 2011 01:43:33 GMT
Distributing writes to all D.C.s? or reads?

If each D.C. has data specific to that particular geo, why do you have to
read from remote D.C. ?

You can easily incorporate logic to re-direct operation(either write/read)
to appropriate(local) D.C.

Still wondering why you want to do so?. Am assuming you want to store data
as per I.P. (geo location data) ..Anyways, it was not very clear from your
question what you are trying to do.

Thanks,
Jahangir Mohammed.

On Tue, Nov 22, 2011 at 7:57 PM, Mathieu Lalonde <mrlalonde@live.ca> wrote:

>
>
> Hi,
>
> I am wondering if Cassandra's features and datacenter awareness can help
> me with my scalability problems.
>
> Suppose that I have a 10-20 Data centers, each with their own local
> (massive) source of time series data.  I would like:
> - to avoid replication across data centers (this seems doable based on:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Different-KeySpaces-for-different-nodes-in-the-same-ring-td5096393.html#a5096568)
> - writes for local data to be done on the local data center (not sure
> about that one)
> - reads from a master data center to any remote data centers (not sure
> about that one either)
>
> It sounds like I am trying to use Cassandra in a very different way that
> it was intended to be used.
> Should I simply have a middle-tier that takes care of distributing reads
> to multiple data centers and treat each data center as its own autonomous
> cluster?
>
> Thanks!
> Matt
>
>

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