Cassandra AWS System Memory Guidelines
System Memory Guidelines for Cassandra AWS Basic guidelines for AWS Cassandra Do not use less than 8GB of memory for the JVM. The more RAM the better. Use G1GC. SSTable are first stored in memory and then written to disk sequentially. The larger the SSTable the less scanning that needs to be done while reading and determining if a key is in an SSTable using a bloom filter. In the EC2 world this equates to an m4.