hive的搭建方式有三种,分别是
-
1、Local/Embedded Metastore Database (Derby)
-
2、Remote Metastore Database
-
3、Remote Metastore Server
一般情况下,我们在学习的时候直接使用hive –service metastore的方式启动服务端,使用hive的方式直接访问登录客户端,除了这种方式之外,hive提供了hiveserver2的服务端启动方式,提供了beeline和jdbc的支持,并且官网也提出,一般在生产环境中,使用hiveserver2的方式比较多 。
使用hiveserver2的优点如下:
-
1、在应用端不需要部署hadoop和hive的客户端。
-
2、hiveserver2不用直接将hdfs和metastore暴露给用户。
-
3、有HA机制,解决应用端的并发和负载问题。
-
4、jdbc的连接方式,可以使用任何语言,方便与应用进行数据交互 。
本文档主要介绍如何进行hive的HA的搭建:
1、环境如下:
环境2、node2—hive-site.xml
<property>
<name>hive.metastore.warehouse.dir</name>
<value>/user/hive/warehouse</value>
</property>
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://node4:3306/hive?createDatabaseIfNotExist=true</value>
</property>
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
</property>
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>root</value>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>123</value>
</property>
<property>
<name>hive.server2.support.dynamic.service.discovery</name>
<value>true</value>
</property>
<property>
<name>hive.server2.zookeeper.namespace</name>
<value>hiveserver2_zk</value>
</property>
<property>
<name>hive.zookeeper.quorum</name>
<value>node2:2181,node3:2181,node4:2181</value>
</property>
<property>
<name>hive.zookeeper.client.port</name>
<value>2181</value>
</property>
<property>
<name>hive.server2.thrift.bind.host</name>
<value>node2</value>
</property>
<property>
<name>hive.server2.thrift.port</name>
<value>10001</value>
</property>
3、node4—hive-site.xml
<property>
<name>hive.metastore.warehouse.dir</name>
<value>/user/hive/warehouse</value>
</property>
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://node4:3306/hive?createDatabaseIfNotExist=true</value>
</property>
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
</property>
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>root</value>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>123</value>
</property>
<property>
<name>hive.server2.support.dynamic.service.discovery</name>
<value>true</value>
</property>
<property>
<name>hive.server2.zookeeper.namespace</name>
<value>hiveserver2_zk</value>
</property>
<property>
<name>hive.zookeeper.quorum</name>
<value>node2:2181,node3:2181,node4:2181</value>
</property>
<property>
<name>hive.zookeeper.client.port</name>
<value>2181</value>
</property>
<property>
<name>hive.server2.thrift.bind.host</name>
<value>node3</value>
</property>
<property>
<name>hive.server2.thrift.port</name>
<value>10001</value>
</property>
4、使用jdbc或者beeline两种方式进行访问
- 1、beeline
!connect jdbc:hive2://node2,node3,node4/;serviceDiscoveryMode=zooKeeper;zooKeeperNamespace=hiveserver2_zk root 123
注意:这里的地址是ZK地址 - 2、jdbc
public class HiveJdbcClient2 {
private static String driverName = "org.apache.hive.jdbc.HiveDriver";
public static void main(String[] args) throws SQLException {
try {
Class.forName(driverName);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Connection conn = DriverManager.getConnection("jdbc:hive2://node2,node3,node4/default;serviceDiscoveryMode=zooKeeper;zooKeeperNamespace=hiveserver2_zk", "root", "");
Statement stmt = conn.createStatement();
String sql = "select * from tbl";
ResultSet res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString(1));
}
}
}
网友评论