title: Apache Cassandra upgrade 3.X from 2.1
body: <p>Is it possible to upgrade Apache Cassandra 2.1.9+ to Apache Cassandra 3.1+ directly?</p>
  
  <p>The release notes for 3.0 mention direct upgrades need a minimum of Apache Cassandra 2.1.9+, but all further releases of Apache Cassandra don't mention whether an intermediate version is needed.</p>