Patent ID: 8904225
Filing Date: 2014-12-02
Classification: G06F

Abstract:
1. A stream data processing failure recovery method in a redundant configuration using a computer group, wherein the computer group includes a first computer that outputs a processing result of an operator group on a query graph of data, the first computer defines a time based on a standby system addition notification indicating that a second computer is added to the computer group, as a reproduction time, in an execution loop of the operator group on the query graph, when executing a target operator whose state is configured be copied in the operator group, if an execution state of the target operator changes from a state at the reproduction time, the first computer stores information representing the change of the state, and at a predetermined timing in the execution loop, the first computer reproduces an execution state of the target operator at the reproduction time from an execution state of the target operator at the timing and the information representing the change of the state and transmits the reproduced execution state to the second computer.