如何使用Java程序通过JDBC访问HDInsight Hive Server



很多用户在使用HDInsight的时候，需要Java客户端访问群集的HiveServer语句、或者提交作业，在Azure的门户已经提供了使用ODBC连接HiveServer的方式（海外环境配置ODBC链接，中国环境配置ODBC链接），本文主要介绍如何让Java程序通过JDBC访问HDInsightHive
Server。

 

首先需要注意的是，从安全的角度，HDInsight会使用SSL安全连接，监听443端口，如下为一个示例连接字符串：jdbc:hive2://myclustername.azurehdinsight.net:443/default;ssl=true?hive.server2.transport.mode=http;hive.server2.thrift.http.path=/hive2

jdbc:hive2://myclustername.azurehdinsight.cn:443/default;ssl=true?hive.server2.transport.mode=http;hive.server2.thrift.http.path=/hive2

 

如下步骤为一个以Maven项目为例的访问HiveServer的示例：

假定已经安装好Eclipse和Maven，为了获取Maven的项目模板，请执行如下命令：

mvn archetype:generate-DgroupId=com.microsoft.css -DartifactId=HiveJdbcTest-DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false 

 修改POM.XML：默认的POM文件，并不包含HDInsight所需的Jar依赖文件，请手动添加以下依赖。

  <dependencies>

         <dependency>

               <groupId>junit</groupId>

               <artifactId>junit</artifactId>

               <version>3.8.1</version>

               <scope>test</scope>

         </dependency>

                      <dependency>

               <groupId>jdk.tools</groupId>

               <artifactId>jdk.tools</artifactId>

               <version>1.8</version>

               <scope>system</scope>

           
<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>

         </dependency>

         <dependency>

               <groupId>org.apache.hive</groupId>

               <artifactId>hive-jdbc</artifactId>

               <version>0.14.0</version>

         </dependency>

             
<dependency>

         <groupId>org.apache.hive</groupId>

         <artifactId>hive-exec</artifactId>

         <version>0.14.0</version>

     </dependency>

     <dependency>

         <groupId>org.apache.calcite</groupId>

         <artifactId>calcite-avatica</artifactId>

         <version>0.9.2-incubating</version>

     </dependency>

     <dependency>

         <groupId>org.apache.calcite</groupId>

         <artifactId>calcite-core</artifactId>

         <version>0.9.2-incubating</version>

     </dependency>

         <dependency>

               <groupId>org.apache.hadoop</groupId>

               <artifactId>hadoop-common</artifactId>

               <version>2.2.0</version>

         </dependency>

  </dependencies>

此外，如需要，请从这里http://mvnrepository.com下载所依赖的Jar文件。

 

Java代码访问HDInsight的示例Hive Table代码如下：

package HiveTest2.MyJDBCTest;

import java.sql.*;

 

publicclass
App {

 

 

   publicstaticvoid
main(String[]args)throws
SQLException {

 

       Connection
conn=null;

       Statement
stmt =null;

       ResultSet
res =null;

 

       try

 

       {

 

           Class.forName("org.apache.hive.jdbc.HiveDriver");

           //Note thatHDInsight uses port 443 for SSL secure connections, and the port forwarderlistening
to 443

           // will direct itto the hiveserver2 from there on port 10001.

           String
connectionQuery ="jdbc:hive2://HDInclusterName.azurehdinsight.net:443/default;ssl=true?hive.server2.transport.mode=http;hive.server2.thrift.http.path=/hive2";

 

           conn = DriverManager.getConnection(connectionQuery,"HDIClusterUserName","HDIUserPassword");

           stmt =conn.createStatement();

 

           String
sql =null;

        

           sql ="Select
* fromhivesampletable LIMIT 3";

           System.out.println("Running:"
+sql);

           

           res =stmt.executeQuery(sql);

 

           while
(res.next()) {

               System.out.println(res.getString(1)
+"\t" +res.getString(2)
+"\t" +res.getString(3)
+"\t" +res.getString(4)
+"\t" +res.getString(5)
+"\t" +res.getString(6));

           }

 

 

           System.out.println("Hive
queriescompleted successfully!");

 

 

       }

       catch (SQLExceptione
)

       {

           e.getMessage();

           e.printStackTrace();

           System.exit(1);//

       }

       catch(Exceptionex)

       {

           ex.getMessage();

           ex.printStackTrace();

           System.exit(1);//

 

       }

       finally {

              if
(res!=null)res.close();

              if
(stmt!=null)stmt.close();

       }

 

   }

 

 }

如下为调用以上代码，成功查询海外Azure和中国Azure的HiveServer的结果

 

 

请注意，针对于中国的Azure，请使用OpenJDK,如AzulJDK，具体方法如下：

从如下地址下载Azul JDK，（针对于Windows环境，，请选择“Windows and MicrosoftAzure”目录下的安装文件）

http://www.azulsystems.com/products/zulu/downloads#Windows

针对于Eclipse开发环境，请从如下路径引用Azul JDK

Eclipse->Windows->Preferences->Java->Installed JREs 

若Zulu文件包未显示，请跳转到如下路径，搜索该JRE文件

 

点击这里，下载整个JavaMaven示例代码。