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From Jonathan Shook <jsh...@gmail.com>
Subject Re: Why Cassandra performs better in 15 nodes than in 20 nodes?
Date Sun, 23 May 2010 23:25:45 GMT
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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