如何启动hiveserver2作为服务

时间:2014-12-22 14:05:45

标签: java hadoop hive apache-zookeeper hadoop2

大家好我在我的网络中设置了多节点集群(即5节点),工作正常。 现在我想使用hive从集群中插入和检索数据,因此我设置了hive最新版本 apache-hive-0.14.0-bin.tar.gz (即 0.14.0 来自here)的主节点,如 this 文章中所述。

我也编写了一个java客户端类,它将使jdbc连接到hive并使用hive将数据插入HDFS。

HiveJdbcClient.Java

public class HiveJdbcClient {

private static final String DRIVER_NAME = "org.apache.hive.jdbc.HiveDriver";
    private static final String HIVE_URL = "jdbc:hive2://x.x.x.x:10000/default";
    private static final String HIVE_UNAME = "";
    private static final String HIVE_PWD = "";
    private static Connection con;

    private HiveJdbcClient() {}

    public static Connection getConnection() {
        try {
            if (con == null) {
                synchronized (HiveJdbcClient.class) {
                    if (con == null) {
                        Class.forName(DRIVER_NAME);
                        con = DriverManager.getConnection(HIVE_URL,
                                HIVE_UNAME, HIVE_PWD);
                        System.out.println("Successfuly Connected to database...!");
                    }
                }// End of synchronized block.
            }// End of if block.
        } catch (SQLException e) {
            System.out.println("Can Not able to connect to database pls check your settings \n" + e);
        } catch (ClassNotFoundException e) {
            System.out.println("Can Not able to connect to database pls check your settings \n" + e);
        }// End of try-catch block. 
        return con;
    }// End of getConnection() Method.

    public static ResultSet executeQuery(String sql) {
        ResultSet set = null;
        try {
            if (sql != null) {
                set = getConnection().createStatement().executeQuery(sql);
            }
        } catch (SQLException e) {
            System.out.println("Error while executing query " + e);
        }// End of try-catch block.
        return set;
    }// End of executeQuery() Method.

    public static void main(String[] args) throws ParseException, SQLException {
        ResultSet res = executeQuery("SELECT * FROM mytable");
        while (res.next()) {
            System.out.println(String.valueOf(res.getString(1)) + '\t'
                    + String.valueOf(res.getFloat(2)) + '\t'
                    + String.valueOf(res.getString(3)));
        }
    }
}//End of HiveJdbcClient Class.

当我在终端

中运行以下命令时,我的应用程序能够连接到服务器
$HIVE_HOME/bin/hiveserver2
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/hadoop-2.6.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/apache-hive-0.14.0-bin/lib/hive-jdbc-0.14.0-standalone.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
OK 

但是当我关闭此终端时,我的应用程序会出现以下错误

ERROR

java.sql.SQLException: Could not open client transport with JDBC Uri: jdbc:hive2://X.X.X.X:10000/default: java.net.ConnectException: Connection refused

这意味着我必须在主节点上运行hiveserver2作为服务。

任何人都可以帮我运行这个hiveserver2作为服务。或任何可以帮助我将hiveserver2作为服务运行的链接。

3 个答案:

答案 0 :(得分:9)

你试过 - 服务选项吗?

$HIVE_HOME/bin/hive --service hiveserver2 &

答案 1 :(得分:6)

对于1.2及更高版本,不推荐使用hive,并且应直接使用hiveserver2命令。

所以现在在后台启动hiveserver2的正确方法是:

nohup hiveserver2 &

或输出到日志文件:

nohup hiveserver2 > hive.log &

来源:https://cwiki.apache.org/confluence/display/Hive/GettingStarted#GettingStarted-BuildingHivefromSource - 它表示“不再使用hive”。

答案 2 :(得分:1)

试试这个

nohup hive --service hiveserver2 &