TencentDB for MongoDB adopts master/slave hot backup architecture. When the master node fails, the service will automatically switch to a slave node. Since a 10-second disconnection may occur during the master/slave switch, you need to set up the auto-restart. The following illustrates how auto disaster recovery works.
- When the master node is unavailable due to an accident, the system will automatically select an alternative master node in the cluster.
- If the master node fails, it will become a slave node after the restart. However, if the restart fails, a new node will be added to the cluster to maintain the specified cluster size.
- Similarly, when a slave node is unavailable, the system will attempt to restart the node or add a new one.