> Is that Casandra problem? > I want Cassandra use memory more effective. How can I do that?
I definitely recommend Jonathan's link, but just to specifically answer this: It's not a Cassandra issue, it's how the JVM will tend to behave in particular with the CMS garbage collector. While under the right circumstances you may get the JVM to avoid growing to maximum heap size, for practical purposes you should probably expect that it will grow to maximum heap size eventually. The way you configure and use Cassandra will determine how much heap space Cassandra will use in operation. How that translates to "used" memory from the perspective of the operating system will largely depend on JVM settings. -- / Peter Schuller
