嗨,所有我已经设置多节点集群(即5个节点)在我的网络工作良好。现在我想使用hive从集群中插入和检索数据,因此我已经在我的主节点上安装了hive最新版本apache-hive-0.14.0-bin.tar.gz(即本文中的0.14.0)。
我还编写了一个java客户机类,它将jdbc连接到hive,并使用hive将数据插入hdfs。
hivejdbcclient.java文件
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
但是当我关闭这个终端时,我的应用程序会出现以下错误
错误
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作为服务运行hiveserver2。
有人能帮我把hiveserver2当作服务运行吗。或者任何可以帮助我将hiveserver2作为服务运行的链接。
3条答案
按热度按时间blpfk2vs1#
试试这个
des4xlb02#
你试过——服务选项吗?
m1m5dgzv3#
对于1.2及以上版本,
hive
已弃用,并且hiveserver2
命令应该直接使用。因此,在后台启动hiveserver2的正确方法是:
或输出到日志文件:
资料来源:https://cwiki.apache.org/confluence/display/hive/gettingstarted#gettingstarted-buildinghivefromsource-它说“调用配置单元”是不赞成的。