multiget would require Order Preserving Partitioner, and this can lead to unbalanced ring and hot spots.
Maybe you can use secondary index on "itemtype" - is must have small cardinality: http://pkghosh.wordpress.com/2011/03/02/cassandra-secondary-index-patterns/ On Tue, Mar 27, 2012 at 10:10 AM, Guy Incognito <dnd1...@gmail.com> wrote: > without the ability to do disjoint column slices, i would probably use 5 > different rows. > > userId:itemType -> activityId > > then it's a multiget slice of 10 items from each of your 5 rows. > > > On 26/03/2012 22:16, Ertio Lew wrote: > >> I need to store activities by each user, on 5 items types. I always want >> to read last 10 activities on each item type, by a user (ie, total >> activities to read at a time =50). >> >> I am wanting to store these activities in a single row for each user so >> that they can be retrieved in single row query, since I want to read all >> the last 10 activities on each item.. I am thinking of creating composite >> names appending "itemtype" : "activityId"(activityId is just timestamp >> value) but then, I don't see about how to read the last 10 activities from >> all itemtypes. >> >> Any ideas about schema to do this better way ? >> > >
