It would be helpful to know the replication factor and consistency levels of your reads and writes.
2010/5/23 史英杰 <shiyingjie1...@gmail.com>: > 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 >
