Assumptions around a rolling upgrade

As a rolling upgrade occurs in a live production environment, it is important to understand the assumptions underlying a rolling upgrade.

After starting the rolling upgrade:

• Guidewire expects most PolicyCenter users to continue to interact with the cluster members running the source build.
• Guidewire expects only a small set of users to interact with the cluster members running the target build.
• Guidewire expects a user to not switch between the source and target configurations as a matter of course. For example, Guidewire does not expect a user to process the same policy on two different cluster members with different configurations by switching back and forth between the configurations.

Guidewire expects you to execute and complete a rolling upgrade during a single scheduled maintenance window. The maintenance window is a period of low activity that spans a duration of hours, not days.