Data disaster recovery method, device and system

A computing system, comprising:

• one or more processors;
• memory;
• and
• a plurality of instructions stored in the memory, wherein the instructions, when executed by the one or more processors, cause the one or more processors to perform the following operations:
• monitoring each node in a logic unit, the nodes comprising a single master node and two or more slave nodes, wherein the single master node provides read-write service corresponding to a client-side request received by the server, and the two or more slave nodes serve as backup for the single master node;
• in accordance with a determination that the master node is abnormal, acquiring log information of the plurality of two or more slave nodes separately, the log information of the two or more slave nodes comprising respective time points of data synchronization between the slave nodes and the master node;
• selecting a respective slave node of the two or more slave nodes having the time point of data synchronization closest to a current time as a target node;
• and
• updating a master-slave relationship in the logic unit, including changing a role of the target node to that of the master node.

A non-transitory computer-readable storage medium storing a plurality of instructions configured for execution by a computing system having one or more processors, wherein the plurality of instructions cause the computing system to perform the following operations:

• monitoring each node in a logic unit, the nodes comprising a single master node and two or more slave nodes, wherein the single master node provides read-write service corresponding to a client-side request received by the server, and the two or more slave nodes server as backup for the single master node;
• in accordance with a determination that the master node is abnormal, acquiring log information of the plurality of two or more slave nodes separately, the log information of the two or more slave nodes comprising respective time points of data synchronization between the slave nodes and the master node;
• selecting a respective slave node of the two or more slave nodes having the time point of data synchronization closest to a current time as a target node;
• and
• updating a master-slave relationship in the logic unit, including changing a role of the target node to that of the master node.