Information processing system

An information processing system comprising:

• a first system comprising a first processor, a first memory storing a first program, and a first data store;
• and
• a second system comprising a second processor, a second memory storing a second program, and a second data store,
• wherein the first processor of the first system is configured to execute the first program to:
• receive values with identifiers of the values from one or more clients;
• enter the values sequentially into the first data store;
• associate each of the values with a sequence ID indicating a position in entry sequence of the values into the first data store;
• and
• transmit a first identifier of a first value and a first sequence ID associated with the first value to the second system,
• wherein the second processor of the second system is configured to execute the second program to hold the first identifier and the first sequence ID received from the first system in a first queue,
• wherein the first processor of the first system is configured to execute the first program to transmit the first sequence ID and the first value to the second system after transmitting the first identifier and the first sequence ID, and
• wherein the second processor of the second system is configured to execute the second program to:
• hold the first value and the first sequence ID received from the first system in a second queue, the second queue configured to store values and associated sequence IDs received from the first system;
• and
• enter the first value, received from the first system after the first identifier and held in the second queue, into the second data store when the first sequence ID held in the second queue is found in the first queue.