Thanks for your reply! //Were all of those 20 nodes running real hardware (i.e. NOT VMs)? Yes, there are 20 real servers running in the cluster, and one Casssandra instance runs on each server. //Did your driver application(s) run on "real" hardware and how many threads did you use? The clients run on one server of the 20 servers, I used 10 threads to run the write and read tasks. How many threads can make Cassandra get good throughput? Thanks! 2010/5/23 Mark Robson <mar...@gmail.com>
> On 23 May 2010 13:42, 史英杰 <shiyingjie1...@gmail.com> wrote: > >> Hi, All >> I am now doing some tests on Cassandra, and I found that both writes >> and reads on 15 nodes are faster than that of 20 nodes, how many servers >> does one Cassandra system contains during the real applications? >> Thanks a lot ! >> >> Yingjie >> > > I'd ask > > Were all of those 20 nodes running real hardware (i.e. NOT VMs)? > > and > > Did your driver application(s) run on "real" hardware and how many threads > did you use? > > Cassandra can only get good throughput with a lot of client threads, not > just a few. > > Mark >
