# hbase-demo

**Repository Path**: wanglitaoo/hbase-demo

## Basic Information

- **Project Name**: hbase-demo
- **Description**: hbase demo
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2020-08-07
- **Last Updated**: 2021-02-03

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

## 实现步骤

1. 创建maven工程，pom中引入相关jar包。
2. 报编写Java代码(HomeworkCreateTab.java)，创建HBase表user_rel
运行main方法，hbase shell中验证表是否创建成功

3. 创建Observer 协处理器(Deletecoprocessor.java)，实现当uid1删除uid2时，触发uid2删除uid1的操作
4. 将项目打成jar包并上传到HDFS
5. 挂载协处理器
```sql
alter 'user_rel',METHOD => 'table_att','Coprocessor'=>'hdfs://linux121:9000/processor/deleteprocessor.jar|com.lagou.hbase.coprocessor.Deletecoprocessor|1001|'
```
![image.png](https://cdn.nlark.com/yuque/0/2020/png/1597423/1596763324274-bfc2c1d2-887f-4fa8-80dc-433b123a6f4e.png?x-oss-process=image%2Fresize%2Cw_1788)

6. 验证

添加测试数据
```sql
hbase(main):021:0> put 'user_rel','1000','friends:1001','1001'
hbase(main):022:0> put 'user_rel','1000','friends:1002','1002'
hbase(main):024:0> put 'user_rel','1001','friends:1000','1000'
hbase(main):025:0> put 'user_rel','1001','friends:1002','1002'
hbase(main):027:0> put 'user_rel','1002','friends:1000','1000'
hbase(main):028:0> put 'user_rel','1002','friends:1001','1001'
```
删除数据，并查看表数据
```sql
delete 'user_rel','1002','friends:1000'
```
![image.png](https://cdn.nlark.com/yuque/0/2020/png/1597423/1596785477575-56582b56-9151-4849-8a78-2495958a95bf.png#align=left&display=inline&height=217&margin=%5Bobject%20Object%5D&name=image.png&originHeight=434&originWidth=1574&size=110543&status=done&style=none&width=787)<br />![image.png](https://cdn.nlark.com/yuque/0/2020/png/1597423/1596785861016-9b2fc412-d7de-4641-a0c6-39f898d5d03f.png#align=left&display=inline&height=141&margin=%5Bobject%20Object%5D&name=image.png&originHeight=282&originWidth=1576&size=73830&status=done&style=none&width=788)