[Question] hugegraph-server怎样做集群部署

### Problem Type (问题类型)

configs (配置项 / 文档相关)

### Before submit

- [ ] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

### Environment (环境信息)

- Server Version: 1.0.0 (Apache Release Version)
- Backend: MySql, HDD
- OS: xx CPUs, xx G RAM, Ubuntu 2x.x / CentOS 7.x
- Data Size: xx vertices, xx edges

### Your Question (问题描述)

1、配置文件中hugegraph-server分为master、worker，master与worker分工是什么？希望有相关介绍文档
2、怎样实现hugegraph-server本身的集群部署？
3、看源码中有raft相关模块，做集群部署是否对节点数有限制？如节点数必须为单数

参考文档：https://hugegraph.apache.org/cn/docs/config/config-option/

### Vertex/Edge example (问题点 / 边数据举例)

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### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

```javascript
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