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From 史英杰 <shiyingjie1...@gmail.com>
Subject Re: Why Cassandra performs better in 15 nodes than in 20 nodes?
Date Mon, 24 May 2010 00:53:47 GMT
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 <jshook@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 <shiyingjie1983@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 <markxr@gmail.com>
> >>
> >> On 23 May 2010 13:42, 史英杰 <shiyingjie1983@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
> >
>

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