Add hosts to Cloudera Manager You can use these hosts later to create new clusters or expand existing clusters. Add hosts to cluster

Sure, adding hosts to Cloudera Manager is a straightforward process. First, you will need to navigate to the Cloudera Manager Admin Console and select "Hosts" from the menu. Then, click on "Add New Hosts" and follow the prompts to add the desired hosts to your cluster. Once the hosts have been added, you can use them to create new clusters or expand existing ones. Let me know if you have any further questions.

相关问题

Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: com.cloudera.impala.jdbc.Driver

根据提供的引用内容，这个错误信息表明在尝试建立JDBC连接时出现了问题。具体来说，它指出了一个嵌套的SQLException，该异常的原因是无法找到名为“com.cloudera.impala.jdbc.Driver”的驱动程序。这通常是由于缺少相应的JDBC驱动程序或驱动程序未正确配置所致。

解决此问题的步骤如下：
1. 确保已正确安装并配置了所需的JDBC驱动程序。在这种情况下，需要确保已正确安装Cloudera Impala JDBC驱动程序。
2. 确保在代码中正确指定了JDBC驱动程序的位置。这通常涉及到在代码中指定正确的JDBC URL和驱动程序类名。
3. 确保数据库服务器正在运行，并且可以从您的应用程序服务器上的网络访问该服务器。

以下是一个Java代码示例，演示如何建立JDBC连接并执行查询：

import java.sql.*;

public class JdbcExample {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // Register JDBC driver
            Class.forName("com.cloudera.impala.jdbc.Driver");

            // Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection("jdbc:impala://localhost:21050/default", "<username>", "<password>");

            // Execute a query
            System.out.println("Creating statement...");
            stmt = conn.createStatement();
            String sql;
            sql = "SELECT id, name, age FROM employees";
            rs = stmt.executeQuery(sql);

            // Extract data from result set
            while (rs.next()) {
                // Retrieve by column name
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");

                // Display values
                System.out.print("ID: " + id);
                System.out.print(", Name: " + name);
                System.out.println(", Age: " + age);
            }
            // Clean-up environment
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException se) {
            // Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // Finally block used to close resources
            try {
                if (stmt != null)
                    stmt.close();
            } catch (SQLException se2) {
            } // nothing we can do
            try {
                if (conn != null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } // end finally try
        } // end try
    }
}

Failed to start cloudera-scm-agent.service: Unit not found.

根据提供的引用内容，可以得知Failed to start cloudera-scm-agent.service: Unit not found.可能是因为/opt/cm-5.7.0/run目录下没有cloudera-scm-agent文件夹导致的。请在终端输入以下命令：sudo systemctl enable cloudera-scm-agent，以确保cloudera-scm-agent服务已启用。如果问题仍未解决，请尝试创建/opt/cm-5.7.0/run/cloudera-scm-agent文件夹并重新启动服务。如果还有问题，请检查/opt/cm-5.7.0/etc/cloudera-scm-agent/config.ini配置文件中的内容是否正确。