java api获取yarn资源池各节点信息

要获取YARN资源池各节点信息，可以使用YARN的Java API。

以下是获取YARN资源池各节点信息的示例代码：

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.NodeReport;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.client.api.YarnClientFactory;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import java.util.List;

public class YarnNodeReport {

    public static void main(String[] args) throws Exception {

        // 创建Yarn客户端
        Configuration conf = new YarnConfiguration();
        YarnClient yarnClient = YarnClientFactory.createYarnClient();
        yarnClient.init(conf);
        yarnClient.start();

        // 获取节点报告
        List<NodeReport> nodeReports = yarnClient.getNodeReports();

        // 输出各节点信息
        for (NodeReport nodeReport : nodeReports) {
            System.out.println("Node ID: " + nodeReport.getNodeId().toString());
            System.out.println("Node HTTP Address: " + nodeReport.getHttpAddress());
            System.out.println("Node Health Report: " + nodeReport.getHealthReport());
            System.out.println("Node Labels: " + nodeReport.getNodeLabels());
            System.out.println("Node State: " + nodeReport.getNodeState().toString());
            System.out.println("Node Total Resource: " + nodeReport.getTotalCapability().toString());
        }

        // 关闭Yarn客户端
        yarnClient.stop();
    }
}

这段代码使用YARN的Java API获取节点报告，输出各节点的信息，包括节点ID、HTTP地址、健康报告、标签、状态和总资源等信息。