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From Robin Verlangen <>
Subject Re: Multiple keyspace question
Date Fri, 06 Jul 2012 09:47:22 GMT
Hi Ben,

The amount of keyspaces is not the problem: the amount of column families
is. Each column family adds a certain amount of memory usage to the system.
You can cope with this by adding memory or using generic column families
that store different types of data.

With kind regards,

Robin Verlangen
*Software engineer*

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2012/7/6 Ben Kaehne <>

> Good evening,
> I have read multiple keyspaces are bad before in a few discussions, but to
> what extent?
> We have some reasonably powerful machines and looking to host
> an additional (currently we have 1) 2 keyspaces within our cassandra
> cluster (of 3 nodes, using RF3).
> At what point does adding extra keyspaces start becoming an issue? Is
> there anything special we should be considering or watching out for as we
> implement this?
> I could not imagine that all cassandra users out there are running one
> massive keyspace, and at the same time can not imaging that all cassandra
> users have multiple clusters just to host different keyspaces.
> Regards.
> --
> -Ben

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