PS: everything above is in bytes, not bits. On Fri, Aug 31, 2012 at 11:03 AM, rohit bhatia <rohit2...@gmail.com> wrote:
> I was wondering how much would be the memory usage of an established > connection in cassandra's heap space. > > We are noticing extremely frequent young generation garbage collections > (3.2gb young generation, ParNew gc every 2 seconds) at a traffic of > 20,000qps for 8 nodes. > We do connection pooling but with 1 connection for 6 requests with > phpcassa. > So, essentially every node has on an average 500 connections > created/destroyed every second. > Could these 500 connections/second cause (on average) 2600Mb memory usage > per 2 second ~ 1300Mb/second. > or For 1 connection around 2-3Mb. > > Is this value expected? (our write requests are simple counter increments > and cannot take up 500KB per request as calculation suggests, rather should > take up only a few hundred bytes). > > Thanks > Rohit >
