I think that the problem was solved. The servers have 8G Ram, we changed the heap to 6 (instead of 4G),
Thanks Kind regards, -Nir SG_Signature_Logo.png Nir Cohen Co-Founder & CTO (+972) 54-242-8419 SimilarWeb <http://www.similarweb.com/> | SimilarSites <http://www.similarsites.com/> | TopSite <http://www.topsite.com/> From: Jonathan Ellis [mailto:jbel...@gmail.com] Sent: Friday, June 03, 2011 2:41 AM To: user@cassandra.apache.org Subject: Re: Performance issues after upgrading to Cassandra 0.7.6-2 from Cassandra 0.6.6 Where is the bottleneck? See http://spyced.blogspot.com/2010/01/linux-performance-basics.html On Thu, Jun 2, 2011 at 11:18 AM, Nir Cohen <n...@similargroup.com> wrote: Hi all, Recently we have upgraded our Cassandra servers to version 0.7.6-2 from 0.6.6 We are experiencing a severe performance issues - we must restart the Cassandra servers every half hour (otherwise our apps servers can't connect to the Cassandra servers). Each Cassandra server has 2 SSD drives (one for data and one for commit log), The amount of the read per second for each server is 500. We haven't experienced those issues in 0.6.6 Do you have any ideas? Kind regards, -Nir SG_Signature_Logo.png Nir Cohen Co-Founder & CTO (+972) 54-242-8419 <tel:%28%2B972%29%2054-242-8419> SimilarWeb <http://www.similarweb.com/> | SimilarSites <http://www.similarsites.com/> | TopSite <http://www.topsite.com/> -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
<<image001.png>>
