spark 通过 Thrift JDBC/ODBC server 实现web JDBC查询

注：参考Thrift JDBC/ODBC server
环境：spark 1.6 mysql

• sparksql 可作为分布式sql查询引擎，web程序通过JDBC连接实现sql查询;
• 实现步骤：
  1. 运行Thrift JDBC/ODBC server
     在Spark目录下运行下面这个命令，启动一个JDBC/ODBC server
     sbin/start-thriftserver.sh --master spark://192.168.172.103:7077 --driver-class-path /usr/local/hive-2.1/lib/mysql-connector-java-5.1.32.jar
     脚本参数可以参考 bin/spark-submit命令支持的选项参数，外加一个 –hiveconf 选项，来指定Hive属性。运行./sbin/start-thriftserver.sh –help可以查看完整的选项列表。默认情况下，启动的server将会在localhost:10000端口上监听。要改变监听主机名或端口，可以用以下环境变量：export HIVE_SERVER2_THRIFT_PORT= export HIVE_SERVER2_THRIFT_BIND_HOST= ./sbin/start-thriftserver.sh --master
     或者Hive系统属性 来指定

./sbin/start-thriftserver.sh \
  --hiveconf hive.server2.thrift.port= \
  --hiveconf hive.server2.thrift.bind.host= \
  --master 

2. 通过beeline 进行连接
   接下来，你就可以开始在beeline中测试这个Thrift JDBC/ODBC server;
   可能需要输入用户名和密码。在非安全模式下，只要输入你本机的用户名和一个空密码即可。对于安全模式，请参考beeline documentation.
   ./bin/beeline beeline> !connect jdbc:hive2://192.168.172.103:10000、

3. 代码连接

   import java.sql.SQLException;
   import java.sql.Connection;
   import java.sql.ResultSet;
   import java.sql.Statement;
   import java.sql.DriverManager;
   
    public class HiveJdbcClient {
    private static String driverName = "org.apache.hive.jdbc.HiveDriver";
    
         /**
        * @param args
        * @throws SQLException
       */
    public static void main(String[] args) throws SQLException {
     try {
     Class.forName(driverName);
   } catch (ClassNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
     System.exit(1);
   }
   //replace "hive" here with the name of the user the queries should run as
   Connection con = DriverManager.getConnection("jdbc:hive2://localhost:10000/default", "hive", "");
   Statement stmt = con.createStatement();
   String tableName = "testHiveDriverTable";
   stmt.execute("drop table if exists " + tableName);
   stmt.execute("create table " + tableName + " (key int, value string)");
   // show tables
   String sql = "show tables '" + tableName + "'";
   System.out.println("Running: " + sql);
   ResultSet res = stmt.executeQuery(sql);
   if (res.next()) {
     System.out.println(res.getString(1));
   }
      // describe table
   sql = "describe " + tableName;
   System.out.println("Running: " + sql);
   res = stmt.executeQuery(sql);
   while (res.next()) {
     System.out.println(res.getString(1) + "\t" + res.getString(2));
   }
   
   // load data into table
   // NOTE: filepath has to be local to the hive server
   // NOTE: /tmp/a.txt is a ctrl-A separated file with two fields per line
   String filepath = "/tmp/a.txt";
   sql = "load data local inpath '" + filepath + "' into table " + tableName;
   System.out.println("Running: " + sql);
   stmt.execute(sql);
   
   // select * query
   sql = "select * from " + tableName;
   System.out.println("Running: " + sql);
   res = stmt.executeQuery(sql);
   while (res.next()) {
     System.out.println(String.valueOf(res.getInt(1)) + "\t" + res.getString(2));
   }
   
   // regular hive query
   sql = "select count(1) from " + tableName;
   System.out.println("Running: " + sql);
   res = stmt.executeQuery(sql);
   while (res.next()) {
     System.out.println(res.getString(1));
   }
     }
   }```
   
   

4. hive-site.xml 配置beeline