必需字段'client_protocol'未设置

Question

我正在使用Hive 0.12,我正在尝试从apache中获取JDBC.当我尝试运行代码时,我得到apache.thrift.TApplicationException.

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));
    }
}

}

我导入了所有必要的jar,当我尝试运行我的代码时,我收到以下错误:

 org.apache.thrift.TApplicationException: Required field 'client_protocol' is unset!   Struct:TOpenSessionReq(client_protocol:null)

我怎样才能解决这个问题？

Answer 1

这表示客户端和服务器之间的版本不匹配,即客户端比服务器更新,这是您的情况.

Answer 2

有同样的问题.如果你设置它是有效的

hive JDBC Maven Repo版本为1.1.0.

检查这个jira.HIve 0.13不支持最新的hive-jdbc版本. https://issues.apache.org/jira/browse/HIVE-6050

在你的pom中添加它.

<dependency>
  <groupId>org.apache.hive</groupId>
  <artifactId>hive-jdbc</artifactId>
  <version>1.1.0</version>
  <classifier>standalone</classifier>
</dependency>