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From Alain RODRIGUEZ <>
Subject Re: Write performance expectations...
Date Wed, 13 Feb 2013 14:21:18 GMT
Is there a particular reason for you to use EBS ? Instance Store
are recommended because they improve performances by reducing the I/O

An other thing you should be aware of is that replicating the data to all
node reduce your performance, it is more or less like if you had only one
node (at performance level I mean).

Also, writing to different datacenters probably induce some network latency.

You should give the EC2 instance type (m1.xlarge / m1.large / ...) if you
want some feedback about the 2500 w/s, and also give the mean size of your


2013/2/13 <>

> Hello,
>      New member here, and I have (yet another) question on write
> performance.
> I'm using Apache Cassandra version 1.1, Python 2.7 and Pycassa 1.7.
> I have a cluster of 2 datacenters, each with 3 nodes, on AWS EC2 using EBS
> and the RandomPartioner. I'm writing to a column family in a keyspace
> that's replicated to all nodes in both datacenters, with a consistency
> level of LOCAL_QUORUM.
> I'm seeing write performance of around 2500 rows per second.
> Is this in the ballpark for this kind of configuration?
> Thanks in advance.
> Ken....

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