Switching apparatus and switching method

A switching apparatus comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• when a first server that executes a reception function of receiving data from a device receives a calculation request for switching a function from the reception function to a task processing function of processing data,
• calculate a data movement amount of data to be moved, among data held by the first server, based on a data amount of unprocessed data that has not been read from a second server which executes the task processing function, a first transfer speed determined from a transfer speed of a bandwidth of the first server and a transfer speed of a bandwidth of a third server which is a movement destination of data held by the first server, and a second transfer speed which is a transfer speed of reading data from the second server;
• specify a movement start position of data that moves from the first server to the third server in the data held by the first server, based on the calculated data movement amount;
• and
• start data movement, from the movement start position, from the first server to the third server.

A switching method comprising:

• when a first server that executes a reception function of receiving data from a device receives a calculation request for switching a function from the reception function to a task processing function of processing data,
• calculating a data movement amount of data to be moved, among data held by the first server, based on a data amount of unprocessed data that has not been read from a second server which executes the task processing function, a first transfer speed determined from a transfer speed of a bandwidth of the first server and a transfer speed of a bandwidth of a third server which is a movement destination of data held by the first server, and a second transfer speed which is a transfer speed of reading data from the second server;
• specifying a movement start position of data that moves from the first server to the third server in the data held by the first server, based on the calculated data movement amount;
• and
• starting data movement, from the movement start position, from the first server to the third server, by a processor.