Methods and systems for managing state changes during an arbitration cycle when multiple computer nodes request changes of shared data

摘要

When multiple nodes in a computer network perform work on a shared entity, an arbitration process is used to ensure changes made by more than one node to the same data is propagated to each of the nodes holding the shared entity and that the changes are applied in the same order on each of the nodes. An arbitration cycle for a particular entity is begun on a node (“instigator”) when the node broadcasts a proposal message for a change to the entity to the other nodes or when the node (“observer”) receives such a proposal message. Multiple nodes can be instigators during a single arbitration cycle. Each node that receives a proposal message sends a response message to the corresponding instigator. The arbitration cycle is closed to additional proposal messages after one instigator has received responses from all the nodes that share the entity. After each instigator node receives all the proposals in the arbitration cycle, it determines whether it is the winner of the arbitration cycle and broadcasts a closure message if it is. Each node determines an order in which to apply the changes proposed in the arbitration cycle when it knows it has received all the proposals in the arbitration cycle as determined by the sending or receiving of the closure message.