impala java api 操作_Cloudera Manager API操作Yarn/Impala队列资源
时间: 2024-03-26 07:38:42 浏览: 99
您好!对于您的问题,我可以提供以下信息:
1. Impala Java API 操作:
您可以使用 Impala JDBC 驱动程序来连接 Impala,并使用 Java 编写应用程序来操作 Impala 数据库。Impala JDBC 驱动程序可以从 Cloudera 官方网站下载。
以下是一个示例代码片段,用于连接 Impala 并执行查询:
```
import java.sql.*;
public class ImpalaJdbcExample {
public static void main(String[] args) {
try {
// Load the JDBC driver
Class.forName("com.cloudera.impala.jdbc.Driver");
// Define the connection URL
String connectionString = "jdbc:impala://<host>:<port>/<database>";
// Connect to Impala
Connection connection = DriverManager.getConnection(connectionString);
// Execute a query
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("SELECT * FROM <table>");
// Process the results
while (resultSet.next()) {
// Do something with each row
}
// Close the resources
resultSet.close();
statement.close();
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
2. Cloudera Manager API 操作 Yarn/Impala 队列资源:
您可以使用 Cloudera Manager API 来管理 Yarn/Impala 队列资源。Cloudera Manager API 是一组 RESTful API,可以用于管理 Cloudera 集群。
以下是一个示例代码片段,用于获取 Impala 队列的资源配额:
```
import com.cloudera.api.*;
import com.cloudera.api.v8.*;
import com.cloudera.api.v8.impala.*;
import com.cloudera.api.model.*;
public class ClouderaManagerApiExample {
public static void main(String[] args) {
try {
// Connect to Cloudera Manager
ApiRoot apiRoot = new ClouderaManagerClientBuilder()
.withHost("<host>")
.withPort(<port>)
.withUsernamePassword("<username>", "<password>")
.build()
.getRootV8();
// Get the Impala service
ImpalaService impalaService = apiRoot.getImpalaService();
// Get the Impala daemon role
ImpalaDaemonRole impalaDaemonRole = impalaService
.getImpalaDaemons("<clusterName>")
.getRoles()
.get(0);
// Get the Impala daemon role config
ApiConfigList impalaDaemonRoleConfig = impalaService
.getConfig(impalaDaemonRole.getName(), impalaDaemonRole.getType());
// Get the Impala queue resource limits
ApiConfig impalaQueueResourceLimits = impalaDaemonRoleConfig
.getConfig("impala_queue_resource_limits");
// Print the Impala queue resource limits
System.out.println(impalaQueueResourceLimits.getValue());
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
希望这些信息能对您有所帮助!
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