On 2010-04-05 02:48, JKnight JKnight wrote: > I want to design the data storage to store user's mark for a large > amount of user. When system run, user's mark changes frequently.
What is a "mark"?
> I want to list top 10 user have largest mark.
Do the "marks" increase monotonically? What other properties do they have?
> Could we use Cassandra for store this data?
>
> Ex, here my Cassandra data model design:
> Mark{
> userId{
> mark_userId
> },
> }
I do not understand that notation. What parts are the CF, key/row, and
column?
> When user's mark changes, we remove old mark_userId and add new
> mark_userId.
> Because user's mark change frequently and with large amount of user, I
> think Cassandra can not satisfy.
On the contrary, Cassandra excels at tracking rapidly changing data and
even shards rows to scale I/O horizontally.
--
David Strauss
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Four Kitchens
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