For now, you should be able to get setup using the official Cassandra documentation.
Please suggest edits to this guide if there are any changes that need to be made to get Cassandra working on Cloud9.
ulimit command doesn’t work in Cloud9, you’ll need to edit
/etc/init.d/cassandra and comment out the line that contains:
ulimit -l unlimited
Once this is done, you can start up cassandra and carry on with business as usual!