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1.文档编写目的
前面我们讲过《如何使用java代码通过JDBC连接Impala(附Github源码)》，本篇文章主要讲述如何使用Java代码通过JDBC的方式连接Hive。
- 内容概述
1.环境准备
2.非Kerberos及Kerberos环境连接示例
- 测试环境
1.Kerberos集群CDH5.11.2，OS为Redhat7.2
2.非Kerberos集群CDH5.13，OS为CentOS6.5
- 前置条件
1.集群已安装HiveServer2服务正常
2.Kerberos和非Kerberos集群HiveServer2服务正常
2.环境准备
1.创建Java工程jdbcdemo
2.添加Maven依赖
代码语言：txt复制<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.6.5</version>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-jdbc</artifactId>
<version>1.1.0</version>
</dependency>3.非Kerberos环境
1.示例代码
代码语言：txt复制private static String JDBC_DRIVER = "org.apache.hive.jdbc.HiveDriver";
private static String CONNECTION_URL ="jdbc:hive2://54.251.129.76:10000/";
static {
try {
Class.forName(JDBC_DRIVER);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
System.out.println("通过JDBC连接非Kerberos环境下的HiveServer2");
Connection connection = null;
ResultSet rs = null;
PreparedStatement ps = null;
try {
connection = DriverManager.getConnection(CONNECTION_URL);
ps = connection.prepareStatement("select * from test_table");
rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getInt(1) "-------" rs.getString(2));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
JDBCUtils.disconnect(connection, rs, ps);
}
}
2.示例代码运行
4.Kerberos环境
连接Kerberos环境下的Hive需要准备Kerberos的krb5.conf文件及keytab文件。
注意：Fayson的测试环境是AWS，所以将kdc和HiveServer2服务的IP地址修改为相应的外网地址，JDBC的URL后Kerberos信息是连接的HiveServer2服务对应Prinical信息。
- krb5.conf配置，直接将集群的krb5.conf文件拷贝至本地开发环境下
# Configuration snippets may be placed in this directory as well
includedir /etc/krb5.conf.d/
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
dns_lookup_realm = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
rdns = false
default_realm = CLOUDERA.COM
#default_ccache_name = KEYRING:persistent:%{uid}
[realms]
CLOUDERA.COM = {
kdc = 54.179.148.25
admin_server = 54.179.148.25
}
keytab文件生成
代码语言：txt复制[ec2-user@ip-172-31-22-86 ~]$ sudo kadmin.local
Authenticating as principal hive/admin@CLOUDERA.COM with password.
kadmin.local: xst -norandkey -k fayson.keytab fayson@CLOUDERA.COM 
1.示例代码
代码语言：txt复制private static String JDBC_DRIVER = "org.apache.hive.jdbc.HiveDriver";
private static String CONNECTION_URL ="jdbc:hive2://54.179.148.25:10000/;principal=hive/ip-172-31-22-86.ap-southeast-1.compute.internal@CLOUDERA.COM";
static {
try {
Class.forName(JDBC_DRIVER);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws Exception {
//登录Kerberos账号
System.setProperty("java.security.krb5.conf", "/Volumes/Transcend/keytab/krb5.conf");
Configuration configuration = new Configuration();
configuration.set("hadoop.security.authentication" , "Kerberos" );
UserGroupInformation. setConfiguration(configuration);
UserGroupInformation.loginUserFromKeytab("fayson@CLOUDERA.COM", "/Volumes/Transcend/keytab/fayson.keytab");
Connection connection = null;
ResultSet rs = null;
PreparedStatement ps = null;
try {
connection = DriverManager.getConnection(CONNECTION_URL);
ps = connection.prepareStatement("select * from test_table");
rs = ps.executeQuery();
while (rs.next()) {
System.out.println(rs.getInt(1));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
JDBCUtils.disconnect(connection, rs, ps);
}
}
2.示例代码运行
GitHub源码地址：
https://github.com/javaxsky/cdhproject
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