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From vineet daniel <>
Subject Re: Design Query
Date Tue, 04 May 2010 09:28:44 GMT
As you havent specified all the details pertaining to filters and your data
layout (structure) at a very high level what i can suggest is that you need
to create a seperate CF for each filter.

On Sat, May 1, 2010 at 5:04 PM, Rakesh Rajan <> wrote:

> I am evaluating cassandra to implement activity streams. We currently have
> over 1000000 feeds with total entries exceeding 320000000 implemented using
> redis ( ~320 entries / feed). Would like hear from the community on how to
> use cassandra to solve the following cases:
>    1. Ability to fetch entries by applying a few filters ( like show me
>    only likes from a given user). This would include range query to support
>    pagination. So this would mean indices on a few columns like the feed id,
>    feed type etc.
>    2. We have around 3 machines with 4GB RAM for this purpose and thinking
>    of having replication factor 2. Would 4GB * 3 be enough for cassandra for
>    this kind of data? I read that cassandra does not keep all the data in
>    memory but want to be sure that we have the right server config to handle
>    this data using cassandra.
> Thanks,
> Rakesh

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