Apparatus and Method for Transferring Event Detector Processes

An apparatus for transferring a first event detector process of a first node of a distributed computing system to a second event detector process of a second node of the distributed computing system, the second node being different from the first node, the apparatus comprising:

• copying circuitry operable to copy a process content of the first event detector process to the second event detector process;
• coordination circuitry operable to coordinate input events of the first event detector process such that the input events of the first event detector process are processed in parallel at both the first and the second event detector processes;
• and
• verification circuitry operable to verify whether the input events of the first event detector process, which are processed in parallel at both the first and the second event detector process, lead to identical output events at both the first and the second event detector processes.

A distributed computing system for determining events based on at least one sensor data stream, the distributed computing system comprising:

• a plurality of distributed computing nodes;
• and
• an apparatus for transferring a first event detector process of a first node of the distributed computing system to a second event detector process of a second node of the distributed computing system, the apparatus comprising copying circuitry operable to copy a process content of the first event detector process to the second event detector process, coordination circuitry operable to coordinate input events of the first event detector process such that the input events of the first event detector process are processed in parallel at both the first and the second event detector processes, and verification circuitry operable to verify whether the input events of the first event detector process, which are processed in parallel at both the first and the second event detector process, lead to identical output events at both the first and the second event detector processes,
• wherein each of the plurality of distributed computing nodes comprises an apparatus for synchronizing a first event, having associated therewith a first event timing value based on a common clock signal, and a second event, having associated therewith a second event timing value based on the common clock signal, wherein the first and the second event experience different delays while travelling through different paths of the distributed computing system, and wherein at least one output event is to be determined by an event detector based on the first and the second event, the apparatus for synchronizing comprising:
• a delay compensator associated to the event detector, the delay compensator having an input for receiving the first and the second event and having an output for forwarding relayed versions of the received first and second event to the associated event detector,
• wherein the delay compensator is operable to relay the first and the second event to the associated event detector based on the experienced delays and based on the associated first and second event timing values.

A method for transferring a first event detector process of a first node of a distributed computing system to a second event detector process of a second node of the distributed computing system, the second node being different from the first node, the method comprising:

• copying a process content of the first event detector process to the second event detector process;
• coordinating input events of the first event detector process such that the input events of the first event detector process are processed in parallel at both the first and the second event detector processes;
• and
• verifying whether the input events of the first event detector process, which are processed in parallel at both the first and the second event detector process, lead to identical output events at both the first and the second event detector processes.