Method and apparatus for allocating availability zone

An apparatus for allocating an availability zone, comprising:

• at least one processor;
• and
• a memory storing instructions, which when executed by the at least one processor, cause the at least one processor to perform operations, the operations comprising:
• receiving an availability zone allocating request sent from a user terminal, the availability zone including at least one data center, the availability zone allocating request including a user identification and a target logical availability zone identification, a logical availability zone identification being an identification of a logical availability zone displayed to the user terminal;
• matching the user identification and the target logical availability zone identification with a user identification allocated with an availability zone and a logical availability zone identification of the availability zone allocated to the user terminal in an availability zone allocation table, the availability zone allocation table further including an availability zone identification of the availability zone allocated to the user terminal;
• and
• acquiring weights of availability zones from a preset availability zone weight table, select a target availability zone from the availability zones by using a ratio of a weight of an availability zone to a sum of the weights of the availability zones as a selection probability, and allocate the target availability zone to the user terminal, in response to an unsuccessful matching of the user identification and the target logical availability zone identification with the availability zone allocation table;
• wherein the selecting a target availability zone from the availability zones by using a ratio of a weight of an availability zone to a sum of the weights of the availability zones as a selection probability comprises:
• generating a weight wheel diagram, wherein the weight wheel diagram is equally divided into a first preset number of sectors, the first preset number of sectors equaling to the sum of the weights of the availability zones, a number of sectors occupied by an availability zone in the weight wheel diagram equaling to a weight of the availability zone;
• generating a random number, and generating a random rotating sector number H utilizing the following formula:
• H=R % W
• wherein R is the random number, W is the sum of the weights of the availability zones, and % is a complementation operator;
• presetting a starting point in the weight wheel diagram and rotating H number of sectors clockwise or anticlockwise around the weight wheel diagram to reach a terminal point;
• and
• defining an availability zone indicated by the terminal point as the target availability zone.

A non-transitory computer storage medium storing a computer program, which when executed by one or more processors, cause the one or more processors to perform operations, the operations comprising:

• receiving an availability zone allocating request sent from a user terminal, the availability zone including at least one data center, the availability zone allocating request including a user identification and a target logical availability zone identification, a logical availability zone identification being an identification of a logical availability zone displayed to the user terminal;
• matching the user identification and the target logical availability zone identification with a user identification allocated with an availability zone and a logical availability zone identification of the availability zone allocated to the user terminal in an availability zone allocation table, the availability zone allocation table further including an availability zone identification of the availability zone allocated to the user terminal;
• and
• acquiring weights of availability zones from a preset availability zone weight table, selecting a target availability zone from the availability zones by using a ratio of a weight of an availability zone to a sum of the weights of the availability zones as a selection probability, and allocating the target availability zone to the user terminal, in response to an unsuccessful matching of the user identification and the target logical availability zone identification with the availability zone allocation table;
• wherein the selecting a target availability zone from the availability zones by using a ratio of a weight of an availability zone to a sum of the weights of the availability zones as a selection probability comprises:
• generating a weight wheel diagram, wherein the weight wheel diagram is equally divided into a first preset number of sectors, the first preset number of sectors equaling to the sum of the weights of the availability zones, a number of sectors occupied by an availability zone in the weight wheel diagram equaling to a weight of the availability zone;
• generating a random number, and generating a random rotating sector number H utilizing the following formula:
• H=R % W
• wherein R is the random number, W is the sum of the weights of the availability zones, and % is a complementation operator;
• presetting a starting point in the weight wheel diagram and rotating H number of sectors clockwise or anticlockwise around the weight wheel diagram to reach a terminal point;
• and
• defining an availability zone indicated by the terminal point as the target availability zone.