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From Aklin_81 <>
Subject Re: Building a News-feed that comprises posts “created by user's connections” && “on the topics user is following”
Date Mon, 10 Jan 2011 03:28:57 GMT
I could think of one way as follows:

Initially writing to all followers about the posts from their network, by
adding a column to the rows of all followers, with name as timestamp(for
sort by time) and value using a JSON that contains two attributes:
#PostIdKey and <list of tags of this post>.
At the read time, compare <list of the tags of this post> with the topics
user is following, if they match then show the post. But this will ofcourse
increase the pressure during reads, which should better have been towards

Please suggest any better way that you could think of..


On Mon, Jan 10, 2011 at 12:11 AM, Aklin_81 <> wrote:

> I am working on a project of Questions & Answers website that allows a user
> to follow questions on certain topics from his network.
> I want to build user's news-feed wall that comprises of only those
> questions that have been posted by his connections and tagged on the topics
> that he is following(his expertise topics).
> After my study of Cassandra I realized that Simple news-feed design that
> shows all the posts from network would be easy to design using Cassandra by
> executing fast writes to all followers of a user about the post from user.
> But for my kind of application where there is an additional filter of
> 'followed topics', (ie, the user receives posts "created by his network" &&
> "on topics user is following"), I could not convince myself with a good
> schema design in Cassandra. I hope if I missed something because of my short
> understanding of cassandra, perhaps, can you please help me out with your
> suggestions of schema/ how this news-feed could be implemented in Cassandra
> ?
> Many thanks !

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