README_ZH.md · bolt/elastic-job

# Elastic-Job - 分布式作业调度解决方案

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# 概述

Elastic-Job是一个分布式调度解决方案，由两个相互独立的子项目Elastic-Job-Lite和Elastic-Job-Cloud组成。

Elastic-Job-Lite定位为轻量级无中心化解决方案，使用jar包的形式提供分布式任务的协调服务。

Elastic-Job-Cloud使用Mesos + Docker的解决方案，额外提供资源治理、应用分发以及进程隔离等服务。

# 功能列表

## 1. Elastic-Job-Lite

* 分布式调度协调
* 弹性扩容缩容
* 失效转移
* 错过执行作业重触发
* 作业分片一致性，保证同一分片在分布式环境中仅一个执行实例
* 自诊断并修复分布式不稳定造成的问题
* 支持并行调度
* 支持作业生命周期操作
* 丰富的作业类型
* Spring整合以及命名空间提供
* 运维平台

## 2. Elastic-Job-Cloud
* 应用自动分发
* 基于Fenzo的弹性资源分配
* 分布式调度协调
* 弹性扩容缩容
* 失效转移
* 错过执行作业重触发
* 作业分片一致性，保证同一分片在分布式环境中仅一个执行实例
* 支持并行调度
* 支持作业生命周期操作
* 丰富的作业类型
* Spring整合
* 运维平台
* 基于Docker的进程隔离(TBD)

# 架构图

## Elastic-Job-Lite

![Elastic-Job-Lite Architecture](http://ovfotjrsi.bkt.clouddn.com/docs/img/architecture/elastic_job_lite.png)
***

## Elastic-Job-Cloud

![Elastic-Job-Cloud Architecture](http://ovfotjrsi.bkt.clouddn.com/docs/img/architecture/elastic_job_cloud.png)

# [Release Notes](https://github.com/elasticjob/elastic-job/releases)

# [Roadmap](ROADMAP.md)

# 快速入门

## Elastic-Job-Lite

### 引入maven依赖

```xml

<dependency>
    <groupId>com.dangdang</groupId>
    <artifactId>elastic-job-lite-core</artifactId>
    <version>${latest.release.version}</version>
</dependency>

<dependency>
    <groupId>com.dangdang</groupId>
    <artifactId>elastic-job-lite-spring</artifactId>
    <version>${latest.release.version}</version>
</dependency>
```
### 作业开发

```java
public class MyElasticJob implements SimpleJob {
    
    @Override
    public void execute(ShardingContext context) {
        switch (context.getShardingItem()) {
            case 0: 
                // do something by sharding item 0
                break;
            case 1: 
                // do something by sharding item 1
                break;
            case 2: 
                // do something by sharding item 2
                break;
            // case n: ...
        }
    }
}
```

### 作业配置

```xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:reg="http://www.dangdang.com/schema/ddframe/reg"
    xmlns:job="http://www.dangdang.com/schema/ddframe/job"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.dangdang.com/schema/ddframe/reg
                        http://www.dangdang.com/schema/ddframe/reg/reg.xsd
                        http://www.dangdang.com/schema/ddframe/job
                        http://www.dangdang.com/schema/ddframe/job/job.xsd
                        ">
    
    <reg:zookeeper id="regCenter" server-lists="yourhost:2181" namespace="dd-job" base-sleep-time-milliseconds="1000" max-sleep-time-milliseconds="3000" max-retries="3" />
    
    
    <job:simple id="oneOffElasticJob" class="xxx.MyElasticJob" registry-center-ref="regCenter" cron="0/10 * * * * ?" sharding-total-count="3" sharding-item-parameters="0=A,1=B,2=C" />
</beans>
```

***

## Elastic-Job-Cloud

### 引入maven依赖

```xml

<dependency>
    <groupId>com.dangdang</groupId>
    <artifactId>elastic-job-cloud-executor</artifactId>
    <version>${latest.release.version}</version>
</dependency>
```

### 作业开发

### 打包作业
tar -cvf yourJobs.tar.gz yourJobs

### 发布APP

```shell
curl -l -H "Content-type: application/json" -X POST -d '{"appName":"foo_app","appURL":"http://app_host:8080/yourJobs.gz","cpuCount":0.1,"memoryMB":64.0,"bootstrapScript":"bin/start.sh","appCacheEnable":true,"eventTraceSamplingCount":0}' http://elastic_job_cloud_host:8899/api/app
```

### 发布作业

```shell
curl -l -H "Content-type: application/json" -X POST -d '{"jobName":"foo_job","jobClass":"yourJobClass","jobType":"SIMPLE","jobExecutionType":"TRANSIENT","cron":"0/5 * * * * ?","shardingTotalCount":5,"cpuCount":0.1,"memoryMB":64.0,"appName":"foo_app","failover":true,"misfire":true,"bootstrapScript":"bin/start.sh"}' http://elastic_job_cloud_host:8899/api/job/register
```

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