The DiskAccessMode is set to auto. I am going to try with standard and see, but i am concerned how much that would affect performance negatively.
thx Amit On Wed, Jul 21, 2010 at 3:59 PM, Aaron Morton <aa...@thelastpickle.com>wrote: > Are you using mmap or auto DiskAccessMode ? > > There is a known issue with memory mapped file access taking up a lot of > memory. See CASSANDRA-1214 > https://issues.apache.org/jira/browse/CASSANDRA-1214 there is also some > discussion in the mail list here. > > Try setting the DiskAccessMode to standard > > Aaron > > > On 22 Jul, 2010,at 10:37 AM, Amit Sinha <amitabhs2...@gmail.com> wrote: > > We are seeing cassandra using very high virtual memory. One server in the > cluster shows 90GB and the other shows about 70GB of committed virtual > memory. > The real memory used is less than 1GB. The Xmx is 4GB. The physical memory > on the machine is 32GB and the swap space on the machine is around 20GB. > > I understand that the virtual memory is not really used by the process and > is just reserved. My question is why does cassandra need to reserve such > huge memory. What is the logic that is used internally. How is it related to > usage pattern or data storage pattern. Should we be concerned? > > thanks > Amit > > > > -- thanks Amitabh
