title: Difference between 3.0.x and 3.11.x versions of cassandra
body: <p>I'm currently using Cassandra version of 3.0.14 on my RHEL cluster. I've found that multiple versions have been released after the version that I'm currently using(<a href="http://www-eu.apache.org/dist/cassandra/redhat/" rel="nofollow noreferrer">http://www-eu.apache.org/dist/cassandra/redhat/</a>). I'm confused about how should I upgrade my cluster because both 3.0.x and 3.11.x had their last version released on 19th Feb, 2018. So what exactly are the differences between the latest release of 3.0.x and latest release of 3.11.x. if 3.11.x is superior, then, should I directly upgrade my cluster from 3.0.14 to 3.11.2? Will all my data remain safe even after the upgrade?</p>