Method for keeping data consistent across different storage systems, computing device, and storage medium

A computing device, comprising:

• a memory and a processor;
• wherein the memory is configured for storing computer executable instructions, and the processor is configured for executing the computer executable instructions to perform operations of:
• during a writing process, updating a first storage system with a write operation, processing, via an atomic operation, first data to be unreadable in a second storage system, and generating or updating, in the atomic operation, a version number corresponding to a first primary key so that the version number is pre-occupied in the second storage system, wherein the first data is data, in a second storage system, corresponding to the first primary key for the write operation;
• during a reading process, determining whether the first data is able to be read, with a read operation, from the second storage system;
• if it is determined that the first data is unable to be read, with the a read operation, from the second storage system, acquiring a latest version number of the first primary key, and reading second data from the first storage system, wherein the second data is data, in the first storage system, corresponding to the first primary key;
• comparing the acquired version number with the latest version number of the first primary key which is pre-occupied in the second storage system;
• if the acquired version number is consistent with the latest version number of the first primary key which is pre-occupied in the second storage system, updating, via the atomic operation, the second data into the second storage system, and updating, in the atomic operation, the version number corresponding to the first primary key;
• and
• if the acquired version number is inconsistent with the latest version number of the first primary key which is pre-occupied in the second storage system, re-performing the step of acquiring the latest version number of the first primary key and reading the second data from the first storage system.

A non-transitory computer readable storage medium, storing computer instructions, wherein the computer instructions, when executed by a processor, implement steps of:

• during a writing process, updating a first storage system with a write operation, processing, via an atomic operation, first data to be unreadable in a second storage system, and generating or updating, in the atomic operation, a version number corresponding to a first primary key so that the version number is pre-occupied in the second storage system, wherein the first data is data, in a second storage system, corresponding to the first primary key for the write operation;
• during a reading process, determining whether the first data is able to be read, with a read operation, from the second storage system;
• if it is determined that the first data is unable to be read, with the read operation, from the second storage system, acquiring a latest version number of the first primary key, and reading second data from the first storage system, wherein the second data is data, in the first storage system, corresponding to the first primary key;
• comparing the acquired version number with the latest version number of the first primary key which is pre-occupied in the second storage system;
• if the acquired version number is consistent with the latest version number of the first primary key which is pre-occupied in the second storage system, updating, via the atomic operation, the second data into the second storage system, and updating, in the atomic operation, the version number corresponding to the first primary key;
• and
• if the acquired version number is inconsistent with the latest version number of the first primary key which is pre-occupied in the second storage system, re-performing the step of acquiring the latest version number of the first primary key and reading the second data from the first storage system.