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From Rakesh Rajan <>
Subject Design Query
Date Sat, 01 May 2010 11:34:31 GMT
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.


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