On Mon, Feb 1, 2010 at 3:31 PM, Brandon Williams <dri...@gmail.com> wrote:
> On Mon, Feb 1, 2010 at 5:20 PM, Erik Holstad <erikhols...@gmail.com>wrote: > >> Hey! >> Have a couple of questions about the best way to use Cassandra. >> Using the random partitioner + the multi_get calls vs order preservation + >> range_slice calls? >> > > When you use an OPP, the distribution of your keys becomes your problem. > If you don't have an even distribution, this will be reflected in the load > on the nodes, while the RP gives you even distribution. > Yeah, that is why it would be nice to hear if anyone has compared the performance between the two, to see if it is worth worrying about your own distribution. I also read that the random partitioner doesn't give that great distribution. > > What is the benefit of using multiple families vs super column? > > > http://issues.apache.org/jira/browse/CASSANDRA-598 is currrently why I > prefer simple CFs instead of supercolumns. > Yeah, this is nasty. > > >> For example in the case of sorting >> in different orders. One good thing that I can see here when using super >> column is that you don't >> have to restart your cluster every time you want to add something new >> order. >> > > A supercolumn can still only compare subcolumns in a single way. > Yeah, I know that, but you can have a super column per sort order without having to restart the cluster. > > When http://issues.apache.org/jira/browse/CASSANDRA-44 is completed, you > will be able to add CFs without restarting. > Looks interesting, but targeted at 0.7, so it is probably going to be a little while, or? > > -Brandon > -- Regards Erik
