在SparkSession实例化之前获取Yarn应用id

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.exceptions.YarnException;
import java.io.IOException;

public class YarnAppIdExample {
    public static void main(String[] args) throws IOException, YarnException {
        Configuration conf = new Configuration();
        YarnClient yarnClient = YarnClient.createYarnClient();
        yarnClient.init(conf);
        yarnClient.start();
        ApplicationId appId = yarnClient.createApplication().getApplicationSubmissionContext().getApplicationId();
        System.out.println("Yarn应用ID：" + appId);
        yarnClient.stop();
    }
}

import org.apache.spark.SparkConf;

public class SparkAppIdExample {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf()
                .setAppName("SparkApp")
                .set("spark.app.id", "your_application_id");
        // 实例化SparkSession
        // ...
    }
}