SpringBoot定时任务多实例互斥执行的完整指南

@Scheduled(cron = "0 0 2 * * ?")
public void scheduledTask() {
    String hostname = InetAddress.getLocalHost().getHostName();
    if (!"app-server-01".equals(hostname)) {
        return;
    }
    // do something
}

@Scheduled(cron = "0 0 2 * * ?")
public void scheduledTask() {
    Boolean locked = stringRedisTemplate.opsForValue()
        .setIfAbsent("task:data-sync", "1", 10, TimeUnit.MINUTES);
    if (Boolean.FALSE.equals(locked)) {
        return;
    }
    try {
        // do something
    } finally {
        stringRedisTemplate.delete("task:data-sync");
    }
}

<dependency>
    <groupId>net.javacrumbs.shedlock</groupId>
    <artifactId>shedlock-spring</artifactId>
    <version>4.42.0</version>
</dependency>
<dependency>
    <groupId>net.javacrumbs.shedlock</groupId>
    <artifactId>shedlock-provider-jdbc-template</artifactId>
    <version>4.42.0</version>
</dependency>

CREATE TABLE shedlock (
    name VARCHAR(64) NOT NULL,
    lock_until TIMESTAMP(3) NOT NULL,
    locked_at TIMESTAMP(3) NOT NULL,
    locked_by VARCHAR(255) NOT NULL,
    PRIMARY KEY (name)
);

@Configuration
@EnableSchedulerLock(defaultLockAtMostFor = "10m")
public class ShedLockConfig {

    @Bean
    public LockProvider lockProvider(DataSource dataSource) {
        return new JdbcTemplateLockProvider(
            JdbcTemplateLockProvider.Configuration.builder()
                .withDataSource(dataSource)
                .withTableName("shedlock")
                .build()
        );
    }
}

@Scheduled(cron = "0 0 2 * * ?")
@SchedulerLock(name = "dataSyncTask", lockAtMostFor = "5m")
public void syncData() {
    // do something
}

INSERT INTO shedlock (name, lock_until, locked_at, locked_by)
VALUES ('dataSyncTask', '2025-01-25 02:05:00', NOW(), '192.168.1.10')
ON DUPLICATE KEY UPDATE
  lock_until = '2025-01-25 02:05:00',
  locked_at = NOW(),
  locked_by = '192.168.1.10'
WHERE lock_until < NOW();

.withLockedByValue("app-" + getServerIp())