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From Mark Robson <>
Subject Re: Use cases for Cassandra
Date Mon, 01 Mar 2010 15:10:01 GMT
On 1 March 2010 13:16, HHB <> wrote:

> Hey,
> What are the typical use cases for Cassandra?

I'm not sure there are *really* typical use cases.

Our use case is likely to be big audit data.

But Cassandra doesn't yet support a mechanism for efficiently expiring old
data; I'm waiting for various things to be implemented (If we were a bit
nearer wanting it, I'd work on it myself!)

I'm working for an ISP (Internet Service Provider), do you think we can
> employ Cassandra? and for what?

I don't know in what capacity you would want to use it. But don't treat it
as a solution looking for a problem, find a problem first and only use
Cassandra IF you feel it's suitable and necessary.

"Conventional" databases are much easier to operate. Or at least, they are
better understood. If you don't need Cassandra's features, then you should
probably use those instead.

For me the killers are:

* Very high write throughput
* High availability

There is also no point in using Cassandra if you plan to deploy less than
(approximately) 6 nodes (maybe 2-3x your replication factor), as you will be
able to achieve good performance at that scale using more conventional


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