During what condition does a Hot Standby Node typically act?

A Hot Standby Node is specifically designed to take over the responsibilities of an active node in the event of a failure. This configuration ensures high availability and reliability of the system, minimizing downtime and data loss. The primary function of a Hot Standby Node is to monitor the active node and seamlessly switch roles when necessary.

When the active node fails, the Hot Standby Node steps in to maintain the continuity of operations, allowing users to continue accessing the system without interruption. This is critical in environments that require constant uptime, such as transactional systems or real-time data processing platforms.

The other conditions, such as all nodes being in operation, scheduled maintenance, or creation of new views, do not typically involve the activation of a Hot Standby Node. These scenarios are managed without requiring a failover, as they do not impact the availability of the active node. Therefore, the correct situation where a Hot Standby Node functions is indeed when another node has failed.