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From "Adam Venturella" <>
Subject Re: Data Model - Additional Column Families or one CF?
Date Mon, 25 Feb 2013 01:51:15 GMT
Thanks Aaron, this was a big help!
Sent from Mailbox for iPhone

On Thu, Feb 21, 2013 at 9:27 AM, aaron morton <>

> If you have a limited / known number (say < 30)  of types, I would create a CF for
each of them.
> If the number of types is unknown or very large I would have one CF with the row key
you described. 
> Generally I avoid data models that require new CF's as the data grows. Additionally having
different CF's allows you to use different cache settings, compactions settings and even storage
> Cheers
> -----------------
> Aaron Morton
> Freelance Cassandra Developer
> New Zealand
> @aaronmorton
> On 21/02/2013, at 7:43 AM, Adam Venturella <> wrote:
>> My data needs only require me to store JSON, and I can handle this in 1 column family
by prefixing row keys with a type, for example:
>> comments:{message_id}
>> Where comments: represents the prefix and {message_id} represents some row key to
a message object in the same column family.
>> In this case comments:{message_id} would be a wide row using comment creation time
and descending clustering order to sort the messages as they are added.
>> My question is, would I be better off splitting comments into their own Column Family
or is storing them in with the Messages Column Family sufficient, they are all messages after
>> Or do Column Families really just provide a nice organizational front for data. I'm
just storing JSON.
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