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首頁 > 數(shù)據(jù)庫 > Redis > Redis生成分布式系統(tǒng)全局唯一ID

Redis生成分布式系統(tǒng)全局唯一ID的實現(xiàn)

作者:李白與酒

在互聯(lián)網(wǎng)系統(tǒng)中,并發(fā)越大的系統(tǒng),數(shù)據(jù)就越大,數(shù)據(jù)越大就越需要分布式,本文主要介紹了Redis生成分布式系統(tǒng)全局唯一ID的實現(xiàn),感興趣的可以了解一下

分布式系統(tǒng)全局唯一ID

在互聯(lián)網(wǎng)系統(tǒng)中,并發(fā)越大的系統(tǒng),數(shù)據(jù)就越大,數(shù)據(jù)越大就越需要分布式,而大量的分布式數(shù)據(jù)就越需要唯一標識來識別它們。

例如淘寶的商品系統(tǒng)有千億級別商品,訂單系統(tǒng)有萬億級別的訂單數(shù)據(jù),這些數(shù)據(jù)都是日漸增長,傳統(tǒng)的單庫單表是無法支撐這種級別的數(shù)據(jù),必須對其進行分庫分表;一旦分庫分表,表的自增ID就失去了意義;故需要一個全局唯一的ID來標識每一條數(shù)據(jù)(商品、訂單)。

e.g: 一張表1億條數(shù)據(jù),被分庫分表10張表,原先的ID就失去意義,所以需要全局唯一ID來標識10張表的數(shù)據(jù)。

全局唯一的ID生成的技術方案有很多,業(yè)界比較有名的有 UUID、Redis、Twitter的snowflake算法、美團Leaf算法。

基于Redis INCR 命令生成分布式全局唯一ID

INCR 命令主要有以下2個特征:

基于以上2個特性,可以采用INCR命令來實現(xiàn)分布式全局ID生成。

采用Redis生成商品全局唯一ID

Project Directory

Maven Dependency

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.8.RELEASE</version>
        <relativePath/>
    </parent>

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.fool.redis</groupId>
    <artifactId>redis-string-id</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.properties

spring.application.name=redis-spring-id
server.port=8888

spring.redis.host=localhost
spring.redis.port=6379
spring.redis.database=0
spring.redis.password=
spring.redis.timeout=2000
spring.redis.pool.max-active=10
spring.redis.pool.max-wait=1000
spring.redis.pool.max-idle=10
spring.redis.pool.min-idle=5
spring.redis.pool.num-tests-per-eviction-run=1024
spring.redis.pool.time-between-eviction-runs-millis=30000
spring.redis.pool.min-evictable-idle-time-millis=60000
spring.redis.pool.soft-min-evictable-idle-time-millis=10000
spring.redis.pool.test-on-borrow=true
spring.redis.pool.test-while-idle=true
spring.redis.pool.block-when-exhausted=false

SRC

Application.java

package org.fool.redis;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Product.java

package org.fool.redis.model;

import lombok.Data;

import java.math.BigDecimal;

@Data
public class Product {
    private Long id;
    private String name;
    private BigDecimal price;
    private String detail;
}

IdGeneratorService.java

package org.fool.redis.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

@Service
public class IdGeneratorService {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    private static final String ID_KEY = "id:generator:product";

    public Long incrementId() {
        return stringRedisTemplate.opsForValue().increment(ID_KEY);
    }
}

ProductController.java

package org.fool.redis.controller;

import lombok.extern.slf4j.Slf4j;
import org.fool.redis.model.Product;
import org.fool.redis.service.IdGeneratorService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
@RequestMapping(value = "/product")
public class ProductController {
    @Autowired
    private IdGeneratorService idGeneratorService;

    @PostMapping(value = "/create")
    public String create(@RequestBody Product obj) {
        //生成分布式id
        long id = idGeneratorService.incrementId();

        //使用全局id 代替數(shù)據(jù)庫的自增id
        obj.setId(id);

        //取模(e.g: 這里分為8張表,海量數(shù)據(jù)可以分為1024張表),計算表名
        int table = (int) id % 8;
        String tableName = "product_" + table;

        log.info("insert to table: {}, with content: {}", tableName, obj);

        return "insert to table: " + tableName + " with content: " + obj;
    }
}

Test

curl --location --request POST 'http://localhost:8888/product/create' \
--header 'Content-Type: application/json' \
--data-raw '{
    "name": "Car",
    "price": "300000.00",
    "detail": "Lexus Style"
}'

Console Output

到此這篇關于Redis生成分布式系統(tǒng)全局唯一ID的實現(xiàn)的文章就介紹到這了,更多相關Redis生成分布式系統(tǒng)全局唯一ID內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家!

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