Data synchronization method, data synchronization apparatus, and distributed system

A data synchronization apparatus, wherein the data synchronization apparatus is separately communicatively connected to each data center in multiple data centers, the multiple data centers comprise at least two data centers, each data center in the at least two data centers comprises at least two nodes, all service nodes in the at least two data centers map to one distributed hash table DHT ring, each consecutive value range in the DHT ring corresponds to a service node, a service node in a first data center in the at least two data centers has at least one backup node that is in at least one second data center in the at least two data centers and whose data interval distribution is corresponding to that of the service node, the data synchronization apparatus comprising:

• a storage device, configured to store routing table information of each data center in the multiple data centers, wherein the routing table information comprises identification information uniquely corresponding to each data center and routing information of each data center;
• a controller, configured to:
• acquire a route update message that instructs to update routing information of the first data center and the second data center, wherein the routing information comprises at least identification information of the first data center and the second data center, and backup routing information of nodes in the first data center and the second data center, and
• adjust the routing information of the first data center and the second data center according to the route update message;
• and
• a transmitter, configured to synchronize adjusted routing information of the first data center and the second data center to the first data center and the second data center, so that the first data center and the second data center perform, based on the adjusted routing information, synchronous transmission on data of managed nodes.

A distributed system, comprising:

• multiple data centers, comprising at least two data centers, wherein each data center in the at least two data centers comprises at least two nodes, all service nodes in the at least two data centers map to one distributed hash table (DHT) ring, each consecutive value range in the DHT ring corresponds to a service node, and a service node in a first data center in the at least two data centers has at least one backup node that is in at least one second data center in the at least two data centers and whose data interval distribution is corresponding to that of the service node;
• and
• a management node, communicatively connected to each data center in the multiple data centers, configured to:
• acquire a route update message that instructs to update routing information of the first data center and the second data center, wherein the routing information comprises at least identification information of the first data center and the second data center, and backup routing information of nodes in the first data center and the second data center,
• adjust the routing information of the first data center and the second data center according to the route update message, and
• synchronize adjusted routing information of the first data center and the second data center to the first data center and the second data center, so that the first data center and the second data center perform, based on the adjusted routing information, synchronous transmission on data of managed nodes.