The replication factor is 3, and the consistency level is default, zero.
It would be helpful to know the replication factor and consistency
levels of your reads and writes.
2010/5/23 史英杰 <firstname.lastname@example.org>:
> 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
> 2010/5/23 Mark Robson <email@example.com>
>> On 23 May 2010 13:42, 史英杰 <firstname.lastname@example.org> 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 !
>> I'd ask
>> Were all of those 20 nodes running real hardware (i.e. NOT VMs)?
>> 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.