It is OS page cache used during read..your os will leverage memory if not being used by any other applications and it improves your read performance.
On Sat, Apr 11, 2020, 12:47 PM HImanshu Sharma <himanshusharma0...@gmail.com> wrote: > Hi > > I am very new to the use of cassandra. In a cassandra cluster of 3 nodes, > I am observing memory usage of cassandra process going more than the heap > memor allocated. As I understand, cassandra allocates off heap memory for > bloom filters, index summary etc. > > When I run nodetool info, I see off heap memory usage around 1.5G, my heap > is 8G. So memory usage should not go above 10G. But in running node it > goes as high as 18G with heavy loads. It comes down with different loads > but always more than 12G. > > I would like to know why memory usage is high and is there way to control > it. > > Thanks > Himanshu Sharma >
