Yes it does change. -----Original Message----- From: Jonathan Ellis [mailto:jbel...@gmail.com] Sent: Thursday, January 13, 2011 11:01 AM To: user Subject: Re: cassandra row cache
does the cache size change between 2nd and 3rd time? On Thu, Jan 13, 2011 at 10:47 AM, Saket Joshi <sjo...@touchcommerce.com> wrote: > Hi, > > I am running a 15 node cluster ,version 0.6.8, Linux 64bit OS, using mmap > I/O, 6GB ram allocated. I have row cache enabled to 80000 keys (mean row > size is 2KB). I am observing a strange behaviour.. I query for 1.6 Million > rows across the cluster and time taken is around 40 mins , I query the same > data again , the time now is 25 mins to fetch data (i am expecting the cache > to be warm now) , but i see row cache hit rate around 30% . Now i request > the same data 3rd time, time to fetch is under 4 mins and cache hit ratios > are 99% ... Does any one have an idea why this may be happening ? > > > > > > Thanks, > > Saket -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
