Changing the stack size and memtable space

Change the stack size to improve performance under Tomcat.

cassandra-env.sh

The location of the cassandra-env.sh file depends on the type of installation:

Package installations	/etc/dse/cassandra/cassandra-env.sh
Tarball installations	`installation_location`/resources/cassandra/conf/cassandra-env.sh

cassandra.yaml

The location of the cassandra.yaml file depends on the type of installation:

Package installations	/etc/dse/cassandra/cassandra.yaml
Tarball installations	`installation_location`/resources/cassandra/conf/cassandra.yaml

Some Solr users have reported that increasing the stack size improves performance under Tomcat. To increase the stack size, uncomment and modify the default -Xss256k setting in the cassandra-env.sh file. Also, decreasing the memtable space to make room for Solr caches might improve performance. Modify the memtable space using the memtable_heap_space_in_mb and memtable_offheap_space_in_mb properties in the cassandra.yaml file.