Abnormality detection apparatus, control method, and program

A control method executed by a computer that handles tasks allocated to a plurality of servers as processing targets in a distribution system having the plurality of the servers, the method including executing:

• acquiring progress history information regarding progress of the plurality of tasks at each of a plurality of time points of recording;
• determining a target range;
• calculating a task speed distribution using only the progress history information the time point of recording of which is included in the target range among the progress history information acquired by the step of acquiring progress history information, the task speed distribution being a probability distribution of processing speeds of the tasks;
• determining whether or not a processing speed of a target task is abnormal by comparing a processing speed of the target task with the task speed distribution, and
• when the processing speed of the target task is determined to be abnormal, performing:
• restarting the target task on the server to which the target task has been allocated when the processing speed of the target task is determined to be abnormal;
• or duplicating the target task and allocating the duplicated task to one of the plurality of servers other than the server to which the target task has been allocated.

A non-transitory computer readable storage medium storing a program causing a computer to have a function of operating as an abnormality detection apparatus that handles tasks allocated to a plurality of servers as processing targets in a distribution system constituted having the plurality of the servers, the program causing the computer to execute:

• acquiring progress history information regarding progress of the plurality of tasks at each of a plurality of time points of recording;
• determining a target range;
• calculating a task speed distribution using only the progress history information the time point of recording of which is included in the target range among the progress history information acquired by the step of acquiring progress history information, the task speed distribution being a probability distribution of processing speeds of the tasks;
• determining whether or not a processing speed of a target task is abnormal by comparing a processing speed of the target task with the task speed distribution, and
• when the processing speed of the target task is determined to be abnormal, performing:
• restarting the target task on the server to which the target task has been allocated when the processing speed of the target task is determined to be abnormal;
• or duplicating the target task and allocating the duplicated task to one of the plurality of servers other than the server to which the target task has been allocated.