saiku不仅可以对传统的RDBMS里面的数据做OLAP分析,还可以对Nosql数据库如Hbase做统计分析。
本文简单介绍下一个使用saiku去查询分析hbase数据的例子。
1、phoenix和hbase的关系
我们知道:hbase虽然好用,但是想用jdbc方式来查询数据单纯的hbase是办不到的,这里需要借助一个JDBC中间件名叫phoenix(英文:凤凰)来实现对HBASE的JDBC查询。在phoenix中可以用简单的sql语句来访问hbase的数据。中间的转换对用户是透明的。 安装只需3步:
、下载phoenix并解压到用户家目录
、将phoenix/lib下的core包和client包拷贝到hbase的lib目录下
、将hbase的hbase-site.xml拷贝到phoenix的bin目录下
注意,集群的每个节点都要如此配置哦 启动phoenix:
进入phoenix/bin,输入命令:./sqlline.py master: master 是zookeeper节点的ip,通过hosts文件映射
2181是zookeeper客户端的默认端口号 进入这个shell之后,可以通过phoenix的命令来操作hbase
比如:
!tables 查看所有表
!columns 表名称 查看某个表的列结构
!quit 退出shell
其他的命令可以输入help查看
普通sql语句直接执行sql操作 如果不用linux shell 客户端,可以使用squirrel sql clinet 这个工具(类似于查询mysql用navicat for mysql) phoenix 安装使用教程:
http://www.cnblogs.com/laov/p/4137136.html phoenix官网语法:
http://phoenix.apache.org/language/index.html squirrel sql clinet 安装使用教程:
http://blog.sina.com.cn/s/blog_79346ff80102v6hm.html
2、在项目中集成phoenix
准备工作:用phoenix创建表Company和Order4 ,为查询列创建索引(耗磁盘资源) 批量导入测试数据
Company(ID-BIGINT,CODE-VARCHAR,NAME-VARCHAR)
ORDER4
| | | ORDER4 | ID | -5 | BIGINT |
| | | ORDER4 | CODE | 12 | VARCHAR |
| | | ORDER4 | NAME | 12 | VARCHAR |
| | | ORDER4 | STATUS | 12 | VARCHAR |
| | | ORDER4 | QUANTITY | 6 | FLOAT |
| | | ORDER4 | ORDERTYPE | 12 | VARCHAR |
| | | ORDER4 | DETAILSIZE | 6 | FLOAT |
| | | ORDER4 | COMPANYID | -5 | BIGINT |
| | | ORDER4 | CREATER | 12 | VARCHAR |
| | | ORDER4 | CREATE_TIME | 91 | DATE |
| | | ORDER4 | UPDATER | 12 | VARCHAR |
| | | ORDER4 | UPDATE_TIME | 91 | DATE |
建表sql例子
DROP TABLE IF EXISTS P_1000;
CREATE TABLE IF NOT EXISTS P_1000 (
HOST CHAR(2) NOT NULL, DOMAIN VARCHAR NOT NULL,
FEATURE VARCHAR NOT NULL,
USAGE.DATE VARCHAR, STATS.ACTIVE_VISITOR INTEGER
CONSTRAINT PK PRIMARY KEY (HOST, DOMAIN, FEATURE)
) SPLIT ON ('CSGoogle','CSSalesforce','EUApple','EUGoogle',
'EUSalesforce', 'NAApple','NAGoogle','NASalesforce');
逐条插入数据
UPSERT INTO p_1000 VALUES('11','localhost1','localhost1','2015-10-11',3);
UPSERT INTO p_1000 VALUES('12','localhost2','localhost2','2015-10-12',31);
UPSERT INTO p_1000 VALUES('13','localhost3','localhost3','2015-10-13',67);
批量导入数据步骤
编写建表sql保存到表名.sql
使用excel生成数据并保存为csv格式 名称必须是表名.csv
编写查询测试sql保存为表名_test.sql
使用phoenix/bin下面的脚本psql.py来执行批量导入
#建表p_1000并导入数据并查询出导入数据
./psql.py master,node1,node2 p_1000_table.sql p_1000.csv p_1000_select.sql
参数分别是:zookeeper节点、建表sql、数据文件、查询sql
其他例子:
psql localhost my_ddl.sql
psql localhost my_ddl.sql my_table.csv
psql -t MY_TABLE my_cluster:1825 my_table2012-Q3.csv
psql -t MY_TABLE -h COL1,COL2,COL3 my_cluster:1825 my_table2012-Q3.csv
psql -t MY_TABLE -h COL1,COL2,COL3 -d : my_cluster:1825 my_table2012-Q3.csv
(1)导入jar
phoenix-4.6.0-HBase-1.0-client-without-hbase.jar
phoenix-4.6.0-HBase-1.0-server.jar
/usr/lib/hbase/hbase.jar
/usr/lib/hadoop/hadoop-common.jar
/usr/lib/hadoop/hadoop-auth.jar
特别注意:如果出现类冲突,将phoenix的jar包优先置顶(Java Build Path)
(2)配置 datasource - order.txt
type=OLAP
name=ORDER_COMPANY
driver=mondrian.olap4j.MondrianOlap4jDriver
Locale=zh_CN
DynamicSchemaProcessor=mondrian.i18n.LocalizingDynamicSchemaProcessor
location=jdbc:mondrian:Jdbc=jdbc:phoenix:master,node1,node2;Catalog=res:saiku-schemas/order.xml;JdbcDrivers=org.apache.phoenix.jdbc.PhoenixDriver
username=name
password=pwd
(3)配置 schema - order.xml
注意表名不管定义时是什么样,在schema文件中都必须大写,否则会报错 table undefined
公司表作为基础信息表,和订单表进行关联。
<?xml version="1.0"?>
<Schema name="ORDER_COMPANY">
<Dimension type="StandardDimension" name="COMPANY_DIMENSION">
<Hierarchy hasAll="true" allMemberName="All Types">
<Table name="COMPANY"></Table>
<Level name="COMPANY_CODE" column="CODE" uniqueMembers="false"/>
<Level name="COMPANY_NAME" visible="true" column="ID" nameColumn="NAME" table="COMPANY" type="String" uniqueMembers="false"/>
</Hierarchy>
</Dimension>
<Cube name="ORDER_COMPANY_CUBE">
<Table name="ORDER4"/>
<DimensionUsage source="COMPANY_DIMENSION" name="USE_COMPANY_DIMENSION" visible="true" foreignKey="COMPANYID" highCardinality="false"></DimensionUsage>
<Dimension name="ORDER_DIMENSION">
<Hierarchy hasAll="true" allMemberName="All Types">
<Level name="Date" column="CREATE_TIME" uniqueMembers="false"/>
</Hierarchy>
</Dimension>
<Measure name="QUANTITY" column="QUANTITY" aggregator="sum" formatString="Standard"/>
</Cube>
</Schema>
(4)修改Mondrina的源代码,重编译到项目中
在查询的时候,需要将大数据表放在所有表之前,不然查询会报错
比如:ORDER4 100多万 company 4条
select * from ORDER4 as o,COMPANY as c where o.companyid = c.id //可以正常查询
select * from COMPANY as c,ORDER4 as o where o.companyid = c.id //报错
Error: Encountered exception in sub plan [0] execution.
SQLState: null
ErrorCode: 0
RolapStar.addToFrom -》 将mdx查询语句转换为传统sql查询语句
query.addFrom(relation, alias, failIfExists);
//将这一句挪到方法最后,这样就调换了事实表(order4大数据表-在前)和 维度表(company小表-在后)
public void addToFrom(
SqlQuery query,
boolean failIfExists,
boolean joinToParent)
{
Util.assertTrue((parent == null) == (joinCondition == null));
if (joinToParent) {
if (parent != null) {
parent.addToFrom(query, failIfExists, joinToParent);
}
if (joinCondition != null) {
query.addWhere(joinCondition.toString(query));
}
}
query.addFrom(relation, alias, failIfExists);//将这一句挪到方法最后
}
翻译的sql语句(能良好执行的)
select
"COMPANY"."CODE" as "c0",
"COMPANY"."ID" as "c1",
"ORDER4"."CREATE_TIME" as "c2",
sum("ORDER4"."QUANTITY") as "m0"
from
"ORDER4" as "ORDER4",//大数据表在前
"COMPANY" as "COMPANY"//小数据表在后
where
"ORDER4"."COMPANYID" = "COMPANY"."ID"
group by
"COMPANY"."CODE",
"COMPANY"."ID",
"ORDER4"."CREATE_TIME"
测试结果
多表联合单维度(10s左右)
多表联合多维度(据情况而定)
备注:mondrian 和 phoenix 集成支持表join ,但是只能是事实表关联维度表,查询速度才正常,查询效率与mysql 比较,无明显提升,可能还有点慢,但是至少解决了数据仓库在hbase中,使用saiku做分析是没问题,经测试数据量在102w事实表和4条维度表关联查询 ,基本保持在7-10秒之间。总之:大数据表在前就对了!
参考资料:
https://blogs.apache.org/phoenix/entry/olap_with_apache_phoenix_and
phoenix-jdbc测试类
package org.saiku.database; import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import org.apache.phoenix.jdbc.Jdbc7Shim.Statement; /**
* 连接数据库的工具类,被定义成不可继承且是私有访问
*/
public final class PhoenixDBUtils {
// private static String url = "jdbc:mysql://localhost:3306/testdb";
// private static String user = "user";
// private static String psw = "pwd"; private static String url = "jdbc:phoenix:master,node1,node2";
private static String user = "hadoop";
private static String psw = "hadoop"; private static Connection conn;
private static Statement statement; static {
try {
// Class.forName("com.mysql.jdbc.Driver");
Class.forName("org.apache.phoenix.jdbc.PhoenixDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
} public static void main(String args[]) throws SQLException {
conn = DriverManager.getConnection(url, user, psw);
statement = (Statement)conn.createStatement();
System.out.println("HI,The connection is:" + conn);
System.out.println("HI,The statement is:" + statement); String sql = "select * from student";
sql = "select \"data\".\"xxid\",\"data\".\"xsrs\" from student";
PreparedStatement ps1 = conn.prepareStatement(sql);
ResultSet rs1 = ps1.executeQuery();
System.out.println("ResultSet is : " +rs1);
List list = resultSetToList(rs1);
System.out.println("LIST is : "+ list);
} private PhoenixDBUtils() {
} /**
* 获取数据库的连接
*
* @return conn
*/
public static Connection getConnection() {
if (null == conn) {
try {
conn = DriverManager.getConnection(url, user, psw);
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
return conn;
} public static Statement getStatement() {
if (null == statement) {
try {
statement = (Statement) PhoenixDBUtils.getConnection().createStatement();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
return statement;
} /**
* 释放资源
*
* @param conn
* @param pstmt
* @param rs
*/
public static void closeResources(Connection conn, PreparedStatement pstmt,
ResultSet rs) {
if (null != rs) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
if (null != pstmt) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
if (null != conn) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
}
}
}
} /**
*
* @Method: com.wdcloud.sql.DBUtils.java
* @Description: TODO 将ResultSet转成list
* @author: luoshoulei
* @date: 2015年11月19日 下午2:08:25
* @version: 1.0
* @param rs
* @return
* @throws java.sql.SQLException
* @List
* @update [日期YYYY-MM-DD] [更改人姓名][变更描述]
*/
public static List resultSetToList(ResultSet rs)
throws java.sql.SQLException {
if (rs == null)
return Collections.EMPTY_LIST;
ResultSetMetaData md = rs.getMetaData(); // 得到结果集(rs)的结构信息,比如字段数、字段名等
int columnCount = md.getColumnCount(); // 返回此 ResultSet 对象中的列数
List list = new ArrayList();
Map rowData = new HashMap();
while (rs.next()) {
rowData = new HashMap(columnCount);
for (int i = 1; i <= columnCount; i++) {
rowData.put(md.getColumnName(i), rs.getObject(i));
}
list.add(rowData);
}
return list;
} }