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From Daning Wang <dan...@netseer.com>
Subject Re: ReadCount change rate is different across nodes
Date Wed, 30 Oct 2013 21:09:29 GMT
Thanks. actually I forgot to mention it is multi-center environment and we
have dynamic snitch disabled. because we saw some performance impact on the
multi-center environment.





On Wed, Oct 30, 2013 at 11:12 AM, Piavlo <lolitushka@gmail.com> wrote:

> On 10/30/2013 02:06 AM, Daning Wang wrote:
>
>> We are running 1.2.5 on 8 nodes(256 tokens). all the nodes are running on
>> same type of machine. and db size is about same. but recently we checked
>> ReadCount stats through jmx, and found that some nodes got  3 times change
>> rate(we have calculated the changes per minute)  than others.
>>
>> We are using hector on client side, and clients are connecting to all the
>> servers, we checked open connections on each server, the numbers are about
>> same.
>>
>> What could cause this problem, how to debug this?
>>
> check per node reads latency CF metrics, and i guess you have dynamic
> snitch enabled?
> http://www.datastax.com/dev/**blog/dynamic-snitching-in-**
> cassandra-past-present-and-**future<http://www.datastax.com/dev/blog/dynamic-snitching-in-cassandra-past-present-and-future>
>
>>
>>
>> Thanks in advance,
>>
>> Daning
>>
>>
>

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