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 <lolitus...@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 >> >> >
