Open topic with navigation
A rolling upgrade moves a NuoDB domain, which might include multiple databases, to a new NuoDB release without shutting down the databases.
Perform a rolling upgrade when continuous database availability is a requirement. If continuous data availability is not a requirement, see Upgrading With Databases Down.
For details of instructions for upgrading your current NuoDB release, and for details of tasks required post-upgrade, see Rolling Upgrade Instructions.
It is best practice to keep a broker in the durable domain configuration while its host is being upgraded. However, in a two-broker domain, in the unusual event that a broker does not restart, broker quorum is lost. Without broker quorum, operations such as the addition of a new host are not allowed. See About Broker Quorum.
In this situation, use the NuoDB Agent Tool to remove the broker from domain membership and regain broker quorum.