Hbase之使用Phoenix连接

本文介绍了如何使用Phoenix来连接Hbase并完成增删改查

1.概述

Phoenix作为应用层和HBASE之间的中间件,以下特性使它在大数据量的简单查询场景有着独有的优势

二级索引支持(global index + local index)
编译SQL成为原生HBASE的可并行执行的scan
在数据层完成计算，server端的coprocessor执行聚合
下推where过滤条件到server端的scan filter上
利用统计信息优化、选择查询计划（5.x版本将支持CBO）
skip scan功能提高扫描速度

2.下载

https://phoenix.apache.org/download.html
选择对应的Hbase版本下载即可

3.安装

3.1.上传解压

tar -zxvf apache-phoenix-4.14.0-HBase-1.2-bin.tar.gz -C /opt/soft

3.2.拷贝jar到Hbase的lib下

scp phoenix-4.14.0-HBase-1.2-server.jar hadoop@hadoop1:/opt/soft/hbase-1.2.6/lib/
scp phoenix-4.14.0-HBase-1.2-server.jar hadoop@hadoop2:/opt/soft/hbase-1.2.6/lib/
scp phoenix-4.14.0-HBase-1.2-server.jar hadoop@hadoop3:/opt/soft/hbase-1.2.6/lib/

4.启动

4.1.启动Hbase

4.2.进入Phoenix控制台

./bin/sqlline.py

通过 help 可以查看命令

0: jdbc:phoenix:> !tables
+------------+--------------+----------------+---------------+----------+------------+----------------------------+-----------------+--------------+-----------+
| TABLE_CAT  | TABLE_SCHEM  |   TABLE_NAME   |  TABLE_TYPE   | REMARKS  | TYPE_NAME  | SELF_REFERENCING_COL_NAME  | REF_GENERATION  | INDEX_STATE  | IMMUTABLE |
+------------+--------------+----------------+---------------+----------+------------+----------------------------+-----------------+--------------+-----------+
|            | SYSTEM       | CATALOG        | SYSTEM TABLE  |          |            |                            |                 |              | false     |
|            | SYSTEM       | FUNCTION       | SYSTEM TABLE  |          |            |                            |                 |              | false     |
|            | SYSTEM       | LOG            | SYSTEM TABLE  |          |            |                            |                 |              | true      |
|            | SYSTEM       | SEQUENCE       | SYSTEM TABLE  |          |            |                            |                 |              | false     |
|            | SYSTEM       | STATS          | SYSTEM TABLE  |          |            |                            |                 |              | false     |
|            |              | TEST           | TABLE         |          |            |                            |                 |              | false     |
|            |              | US_POPULATION  | TABLE         |          |            |                            |                 |              | false     |
+------------+--------------+----------------+---------------+----------+------------+----------------------------+-----------------+--------------+-----------+

CRUD

0: jdbc:phoenix:> !sql
. . . . . . . . > create table test1 (mykey integer not null primary key, mycolumn varchar);
No rows affected (1.538 seconds)
0: jdbc:phoenix:> !sql
. . . . . . . . > upsert into test1 values (1,'Hello');
1 row affected (0.064 seconds)
0: jdbc:phoenix:> !sql
. . . . . . . . > select * from test1;
+--------+-----------+
| MYKEY  | MYCOLUMN  |
+--------+-----------+
| 1      | Hello     |
+--------+-----------+
1 row selected (0.09 seconds)
0: jdbc:phoenix:> !sql
. . . . . . . . >  delete from test1 where mykey = 1;
1 row affected (0.074 seconds)
0: jdbc:phoenix:> select * from test1;
+--------+-----------+
| MYKEY  | MYCOLUMN  |
+--------+-----------+
+--------+-----------+
No rows selected (0.153 seconds)

键入 !quit 退出shell

5.JavaAPI

5.1.引入依赖

    org.apache.phoenix
    phoenix-core
    4.14.0-HBase-1.2

5.2.CRUD

public class PhoenixTest {
    public static void main(String[] args) throws Exception {
        Statement stmt = null;
        ResultSet rset = null;

        Connection con = DriverManager.getConnection("jdbc:phoenix:hadoop1,hadoop2,hadoop3");
        stmt = con.createStatement();
        stmt.executeUpdate("create table test (mykey integer not null primary key, mycolumn varchar)");
        stmt.executeUpdate("upsert into test values (1,'Hello')");
        stmt.executeUpdate("upsert into test values (2,'World!')");
        con.commit();

        PreparedStatement statement = con.prepareStatement("SELECT * from test");
        rset = statement.executeQuery();
        while (rset.next()) {
            System.out.println(rset.getString("mycolumn"));
        }
        statement.close();
        con.close();
    }
}

参考：
[Phoenix] 一、快速入门