分布式 任务调度(XXL-JOB)

简介：XXL-JOB是一个分布式任务调度平台，优点是开发迅速、学习简单、轻量级、易扩展。

1. xxl-job

 　   A. xxl-job-admin：调度中心，作用是统一管理任务调度平台上调度任务，负责触发调度执行，并且提供任务管理平台；

　　B. xxl-job-core：公共jar依赖；

　　C. xxl-job-executor-samples：执行器Sample示例；

　　D. 初始化SQL脚本位置：/xxl-job-master/doc/db/tables_xxl_job.sql；

　　E. 访问地址：http://localhost:8080/xxl-job-admin，默认账号密码 “admin/123456”。

2. 执行器项目

　　A. pom.xml Maven依赖

<dependency>
    <groupId>com.xuxueli</groupId>
    <artifactId>xxl-job-core</artifactId>
    <version>2.2.0</version>
</dependency>

　　B. 配置文件

### xxl-job admin address list, such as "http://address" or "http://address01,http://address02"
xxl.job.admin.addresses=http://127.0.0.1:8080/xxl-job-admin

### xxl-job, access token
xxl.job.accessToken=

### xxl-job executor appname
xxl.job.executor.appname=xxl-job-executor-sample
### xxl-job executor registry-address: default use address to registry , otherwise use ip:port if address is null
xxl.job.executor.address=
### xxl-job executor server-info
xxl.job.executor.ip=
xxl.job.executor.port=9999
### xxl-job executor log-path
xxl.job.executor.logpath=/data/applogs/xxl-job/jobhandler
### xxl-job executor log-retention-days
xxl.job.executor.logretentiondays=30

　　C. 配置类

package com.xxl.job.executor.core.config;

import com.xxl.job.core.executor.impl.XxlJobSpringExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * xxl-job config
 *
 * @author xuxueli 2017-04-28
 */
@Configuration
public class XxlJobConfig {
    private Logger logger = LoggerFactory.getLogger(XxlJobConfig.class);

    @Value("${xxl.job.admin.addresses}")
    private String adminAddresses;

    @Value("${xxl.job.accessToken}")
    private String accessToken;

    @Value("${xxl.job.executor.appname}")
    private String appname;

    @Value("${xxl.job.executor.address}")
    private String address;

    @Value("${xxl.job.executor.ip}")
    private String ip;

    @Value("${xxl.job.executor.port}")
    private int port;

    @Value("${xxl.job.executor.logpath}")
    private String logPath;

    @Value("${xxl.job.executor.logretentiondays}")
    private int logRetentionDays;

    @Bean
    public XxlJobSpringExecutor xxlJobExecutor() {
        logger.info(">>>>>>>>>>> xxl-job config init.");
        XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
        xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
        xxlJobSpringExecutor.setAppname(appname);
        xxlJobSpringExecutor.setAddress(address);
        xxlJobSpringExecutor.setIp(ip);
        xxlJobSpringExecutor.setPort(port);
        xxlJobSpringExecutor.setAccessToken(accessToken);
        xxlJobSpringExecutor.setLogPath(logPath);
        xxlJobSpringExecutor.setLogRetentionDays(logRetentionDays);

        return xxlJobSpringExecutor;
    }

}

 3. 常见问题

　　A. 问题一：XXL-JOB连接数据库一段时间后：com.zaxxer.hikari.pool.PoolBase - HikariCP - Failed to validate connection org.mariadb.jdbc.MariaDbConnection@250027e1 ((conn=2838498) Connection reset). Possibly consider using a shorter maxLifetime value.

　　　　原因：数据库最大连接等待时间比xxl-job里maxLifetime大

 

 　　解决办法：调小maxLifeTime值，如 --spring.datasource.hikari.max-lifetime=120000。

 

可参考：分布式任务调度平台XXL-JOB