incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Paul Prescod <p...@prescod.net>
Subject Re: replication impact on write throughput
Date Wed, 12 May 2010 02:13:10 GMT
On Tue, May 11, 2010 at 5:56 PM, Mark Greene <greenemj@gmail.com> wrote:
> I was under the impression from what I've seen talked about on this list
> (perhaps I'm wrong here) that given the write throughput of one node in a
> cluster (again assuming each node has a given throughput and the same
> config) that you would simply multiply that throughput by the number of
> nodes you had, giving you the total throughput for the entire ring (like you
> said this is somewhat artificial). The main benefit being that adding
> capacity was as simple as adding more nodes to the ring with no degradation.
> So by your math, 100 nodes with each node getting 5k wps, I would assume the
> total capacity is 500k wps. But perhaps I've misunderstood some key
> concepts. Still a novice myself ;-)

If the replication factor is 2, then everything is written twice. So
your throughput is cut in half.

 Paul Prescod

Mime
View raw message