Risks associated with rolling upgrade of cluster server members

In performing a rolling upgrade, you trade safety for convenience. In particular, there are risks associated with modifying any configuration related to distributed processing such as batch processes and work queues. Do not attempt to perform a rolling upgrade of the production PolicyCenter cluster if your changes affect those areas of the application.

It is possible for individual PolicyCenter servers in the cluster to fail the rolling upgrade process for a variety of reasons. If so, you need to spend time testing and recovering from a failed attempt to return a server to a safe state. In particular, you need to review any entities that possibly changed due to the deployment process.