I just installed Cassandra on my ubuntu server by adding the following to the sources list:

deb http://www.apache.org/dist/cassandra/debian 10x main
deb-src http://www.apache.org/dist/cassandra/debian 10x main


Soon after install I started getting OOM errors & then the server became unresponsive. I added more RAM to the server but found that cassandra was consuming 100% CPU & 1GB RAM as soon the server was being started. Why is this happening & how can get it to normal conditions ?