Distributed data processing

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• identifying an invocation frequency for each of a first number of candidate key-value pairs in a predetermined period of time, wherein the invocation frequency is a number of times the corresponding candidate key-value pair was called by a service system in the predetermined period of time;
• selecting a second number of hot key-value pairs from the candidate key-value pairs, wherein the hot key-value pairs comprise at least one of:
• candidate key-value pairs that have invocation frequencies higher than a predetermined threshold, or candidate key-value pairs with key values within a key value interval;
• mapping, as intermediate key-value pairs, the second number of hot key-value pairs;
• and
• reducing, as resultant key-value pairs, the intermediate key-value pairs, wherein the resultant key-value pairs are to be called by the service system.

A computer-implemented system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• identifying an invocation frequency for each of a first number of candidate key-value pairs in a predetermined period of time, wherein the invocation frequency is a number of times the corresponding candidate key-value pair was called by a service system in the predetermined period of time;
• selecting a second number of hot key-value pairs from the candidate key-value pairs, wherein the hot key-value pairs comprise at least one of:
• candidate key-value pairs that have invocation frequencies higher than a predetermined threshold, or candidate key-value pairs with key values within a key value interval;
• mapping, as intermediate key-value pairs, the second number of hot key-value pairs;
• and
• reducing, as resultant key-value pairs, the intermediate key-value pairs, wherein the resultant key-value pairs are to be called by the service system.