I'd review the CHANGES.txt to see what has changed and the NEWS.txt to see what you need to do before upgrading (config changes, data storage changes, etc).
Generally: - Determine what version you are upgrading to, and why - Snapshot the data across all nodes - Upgrade the nodes one at a time (rolling upgrade) For a change this major, you should set up a test cluster and see if there are any changes after the upgrade. -- Patricia Gorla @patriciagorla Consultant Apache Cassandra Consulting http://www.thelastpickle.com <http://thelastpickle.com>
