Hi,Jonathan I am sorry that there is something wrong with the CL I said last time, I checked the test code agagin. The version we used is 0.6.0-Beta3, and both the write and read CL are ConsistencyLevel.ONE.
2010/5/24 Jonathan Ellis <jbel...@gmail.com> > ZERO hasn't been the default CL for a long time. You should upgrade > to 0.6.1. (Read NEWS first to see what has changed.) > > 2010/5/23 史英杰 <shiyingjie1...@gmail.com>: > > The replication factor is 3, and the consistency level is default, zero. > > > > 在 2010年5月24日 上午7:25，Jonathan Shook <jsh...@gmail.com>写道： > >> > >> 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 > >> > > > > > > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
