Did you try generating a heap dump so you can look through it to see what’s actually happened?
> On Jan 6, 2015, at 12:58 AM, Rahul Bhardwaj <rahul.bhard...@indiamart.com> > wrote: > > Hi, > > We are using cassandra 2.1 version in a cluster of three machines each with > 64 GB RAM > > The processes are killed by kernel, coz they are eating all memory > (oom-killer). We have set JAVA heap to default (i.e. it is using 8G) because > we have 64 GB RAM. > > Please help. > > > Regards: > Rahul Bhardwaj > > > Follow IndiaMART.com <http://www.indiamart.com/> for latest updates on this > and more: <https://plus.google.com/+indiamart> > <https://www.facebook.com/IndiaMART> <https://twitter.com/IndiaMART> Mobile > Channel: > <https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=668561641&mt=8> > <https://play.google.com/store/apps/details?id=com.indiamart.m> > <http://m.indiamart.com/> > > <https://www.youtube.com/watch?v=DzORNbeSXN8&list=PL2o4J51MqpL0mbue6kzDa6eymLVUXtlR1&index=2> > Watch how Irrfan Khan gets his work done in no time on IndiaMART, kyunki Kaam > Yahin Banta Hai <https://www.youtube.com/watch?v=hmS4Afl2bNU>!!!