It would be nice to have a light-weight transaction support in cassandra-stress.
Although currently in cassandra-stress we can achieve light-weight transaction partially by using static conditions like "IF col1 != null" or "IF not EXIST".
If would be ideal to have full fledged light-weight transaction support like "IF col1 = ? and col2 = ?". One way to implement is to read values from Cassandra and use that in the condition so it will execute all the paxos phases in Cassandra.
Please find git link for the patch: https://github.com/apache/cassandra/compare/trunk...jaydeepkumar1984:13529-trunk?expand=1