Identifier generation method and device based on Redis

Abstract

The invention discloses an identifier generation method and device based on Redis, and relates to the technical field of computers. A specific embodiment of the method comprises the steps of receivingan identifier generation request, and detecting whether a current main database runs normally or not; if so, setting the main / standby switching flag bit as a first numerical value, and generating anidentifier by utilizing the main database based on the sign bit, the first numerical value and the serial number; and if soothe current main database runs abnormally, setting the main / standby switching flag bit as a second numerical value, carrying out main / standby switching on the main database and a normally running standby database, and further generating an identifier by utilizing the standbydatabase based on the sign bit, the second numerical value and the serial number. According to the embodiment, the values of the main and standby switching flag bits are different when the main database or the standby database is used, so that the uniqueness and high availability of identifier generation are ensured, the disaster tolerance capability is high, and a single-point fault is avoided. By setting the idle bits, the ID length can be shortened, the occupation amount of the storage space is reduced, and subsequent dynamic expansion of other identification bits is facilitated.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a Redis-based identification generation method and device. Background technique [0002] In a complex distributed system, it is often necessary to uniquely identify a large amount of data and messages, such as the contract number in the contract system, the serial number such as the loan number or bank card number in the core, mortgage, and collection system, etc. These unique identifications are Distributed ID. [0003] The current Redis-based distributed ID generation method usually uses Redis single-threaded features and expiration strategies to obtain IDs. The generated distributed IDs are 64 bits, as follows: use 41 bits to store time, accurate to milliseconds; use 12 bits to store logic points Fragment ID, the maximum fragment ID is 4095; if 10bit is used to store self-increasing ID, each node can generate up to 1024 IDs per millisecond. [0004] In the process ...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the synchronization problem between the master and slave in the master-standby mode of Redis, once the master is abnormal, when the slave is switched over during failover, the ID may be duplicated due to the master-standby consistency problem;

[0006] 2. The timestamp is generated based on the local clock of the working device. Therefore, when the clock of the working device is dialed back, the timestamp of the generated ID will also be rolled back. If the ID is still generated according to the timestamp after the rollback, it may There will be a problem of ID duplication;

[0007] 3. The 64-bit ID is redundant for most software systems, will take up too much storage space, and cannot be appropriately expanded according to the application scenario

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