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Maintenance window is a weekly four-hour window. All changes that may cause service interruption (like upgrades) will be executed within the maintenance windows. During maintenance window, an uncontrolled disconnections and inability to connect to cluster can happen. Such disconnections are destructive for any ongoing transactions and also clients should reconnect.
Maintenance window consists of two parts. The first part specifies the day of the week, while the second part specifies the expected time. Here is an example of a maintenance window configuration: