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From Jon Graham <sjclou...@gmail.com>
Subject Determining Cassandra System/Memory Requirements
Date Mon, 03 May 2010 21:34:15 GMT
Hello Everyone,

Is there a practical formula for determining Cassandra system requirements
using OrderPreservingPartitioner ?

We have hundreds of millions of rows in a single column family with a
potential target of maybe a billion rows.

How can we estimate the Cassandra system requirements given factors such as:

N=number of nodes
M=memory allocated for Cassandra
R=replication factor
K=key size
D=individual column data size
CR=columns/row
NR=number of rows (keys) in column family

It seems like the compaction process gets more stressed as we add more data,
but I have no idea how close we are
to a breaking point.

Thanks,
Jon

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