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From: Jonathan Ellis <jbellis@gmail.com>
Date: Mon, 9 May 2011 21:49:57 -0500
Message-ID: <BANLkTimSVRDD6-ZBzcMZ_RVjcCwRy4D9LQ@mail.gmail.com>
Subject: Re: Ec2 Stress Results
To: user@cassandra.apache.org
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On Mon, May 9, 2011 at 5:58 PM, Alex Araujo <cassandra->> How many
replicas are you writing?
>
> Replication factor is 3.

So you're actually spot on the predicted numbers: you're pushing
20k*3=60k "raw" rows/s across your 4 machines.

You might get another 10% or so from increasing memtable thresholds,
but bottom line is you're right around what we'd expect to see.
Furthermore, CPU is the primary bottleneck which is what you want to
see on a pure write workload.

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com