我在运行map reduce java应用程序时遇到问题我使用aws提供的教程代码简化了问题，该教程运行预定义步骤：

public class Main {

public static void main(String[] args) {

    AWSCredentials credentials = getCredentials();
    AmazonElasticMapReduceClient emr = new AmazonElasticMapReduceClient(
            credentials);

    StepFactory stepFactory = new StepFactory();

    StepConfig enabledebugging = new StepConfig()
            .withName("Enable debugging")
            .withActionOnFailure("TERMINATE_JOB_FLOW")
            .withHadoopJarStep(stepFactory.newEnableDebuggingStep());

    StepConfig installHive = new StepConfig().withName("Install Hive")
            .withActionOnFailure("TERMINATE_JOB_FLOW")
            .withHadoopJarStep(stepFactory.newInstallHiveStep());

    RunJobFlowRequest request = new RunJobFlowRequest()
            .withName("Hive Interactive")
            .withAmiVersion("3.3.1")
            .withSteps(enabledebugging, installHive)
            .withLogUri("s3://tweets-hadoop/")
            .withServiceRole("service_role")
            .withJobFlowRole("jobflow_role")
            .withInstances(
                    new JobFlowInstancesConfig().withEc2KeyName("hadoop")
                            .withInstanceCount(5)
                            .withKeepJobFlowAliveWhenNoSteps(true)
                            .withMasterInstanceType("m3.xlarge")
                            .withSlaveInstanceType("m1.large"));

    RunJobFlowResult result = emr.runJobFlow(request);
    System.out.println(result);
}

   private static AWSCredentials getCredentials() {
        AWSCredentials credentials = null;
        credentials = new BasicAWSCredentials("<KEY>","<VALUE>");
        return credentials;
    }

}
其中，'hadoop'是我在ec2控制台中创建的密钥对。
运行后，我看到作业试图在emr控制台中启动，1分钟后，它从“启动”更改为“终止时出错验证错误”
没有提供其他信息
有什么问题吗？
谢谢！