The current branch merge path is, in full: cassandra-2.1 | cassandra-2.2 | cassandra-3.0 | cassandra-3.11 | cassandra-3.X | trunk
Wherever you start, please follow through the complete path to trunk. I reopened JIRAs #12768, #12817, and #12694 for skipping cassandra-3.11. Owners of those tickets, please commit to the cassandra-3.11 branch and merge up. There were too many conflicts for me to comfortably try to resolve on a straight merge from 3.0. -- Kind regards, Michael