86.通过Livy的RESTful API接口向CDH集群提交作业

• Livy版本为：0.4
• CM和CDH版本为：5.13.1
• 集群未启用Kerberos

• 将作业运行的jar包上传到HDFS目录
• 使用Maven创建Livy示例工程
• pom文件中添加如下依赖

    org.apache.httpcomponents
    httpclient
    4.5.4

1.编写示例代码

• HTTP请求的工具类（HttpUtils.java）

package com.cloudera.utils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.Map;

public class HttpUtils {
    
    public static String getAccess(String url, Map headers) {
        String result = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);
        if(headers != null && headers.size() > 0){
            headers.forEach((K,V)->httpGet.addHeader(K,V));
        }
        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity);
            System.out.println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    
    public  static String deleteAccess(String url, Map headers) {
        String result = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpDelete httpDelete = new HttpDelete(url);
        if(headers != null && headers.size() > 0){
            headers.forEach((K,V)->httpDelete.addHeader(K,V));
        }
        try {
            HttpResponse response = httpClient.execute(httpDelete);
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity);
            System.out.println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    
    public static String postAccess(String url, Map headers, String data)  {
        String result = null;
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost post = new HttpPost(url);
        if(headers != null && headers.size() > 0){
            headers.forEach((K,V)->post.addHeader(K,V));
        }
        try {
            StringEntity entity = new StringEntity(data);
            entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json");
            post.setEntity(entity);
            HttpResponse response = httpClient.execute(post);
            HttpEntity resultEntity = response.getEntity();
            result = EntityUtils.toString(resultEntity);
            System.out.println(result);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

• Livy RESTful API调用示例代码

package com.cloudera.nokerberos;
import com.cloudera.utils.HttpUtils;
import java.util.HashMap;

public class AppLivy {
    private static String LIVY_HOST = "http://ip-186-31-7-186.fayson.com:8998";
    public static void main(String[] args) {
        HashMap headers = new HashMap<>();
        headers.put("Content-Type", "application/json");
        headers.put("Accept", "application/json");
        headers.put("X-Requested-By", "fayson");
        //创建一个交互式会话
//        String kindJson = "{"kind": "spark", "proxyUser":"fayson"}";
//        HttpUtils.postAccess(LIVY_HOST + "/sessions", headers, kindJson);
        //执行code
//        String code = "{"code":"sc.parallelize(1 to 2).count()"}";
//        HttpUtils.postAccess(LIVY_HOST + "/sessions/1/statements", headers, code);
        //删除会话
//        HttpUtils.deleteAccess(LIVY_HOST + "/sessions/2", headers);
        //封装提交Spark作业的JSON数据
        String submitJob = "{"className": "org.apache.spark.examples.SparkPi","executorMemory": "1g","args": [200],"file": "/fayson-yarn/jars/spark-examples-1.6.0-cdh5.13.1-hadoop2.6.0-cdh5.13.1.jar", "proxyUser":"fayson"}";
        //向集群提交Spark作业
        HttpUtils.postAccess(LIVY_HOST + "/batches", headers, submitJob);
        //通过提交作业返回的SessionID获取具体作业的执行状态及APPID
        HttpUtils.getAccess(LIVY_HOST + "/batches/3", headers);
    }
}

2.代码运行

• 运行AppLivy代码，向集群提交Spark作业，响应结果：

{
  "id": 4,
  "state": "starting",
  "appId": null,
  "appInfo": {
    "driverLogUrl": null,
    "sparkUiUrl": null
  },
  "log": ["stdout: ", "nstderr: ", "nYARN Diagnostics: "]
}

• 获取作业运行状态，将上一步获取到的id传入到如下请求
  
• 响应结果：
  • 通过如上返回的结果，我们可以看到作业的APPID

{
  "id": 4,
  "state": "success",
  "appId": "application_1518401384543_0008",
  "appInfo": {
    "driverLogUrl": null,
    "sparkUiUrl": "http://ip-186-31-6-148.fayson.com:8088/proxy/application_1518401384543_0008/"
  },
  "log": ["stdout: ", "WARNING: User-defined SPARK_HOME (/opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/lib/spark) overrides detected (/opt/cloudera/parcels/CDH/lib/spark).", "WARNING: Running spark-class from user-defined location.", "nstderr: ", "nYARN Diagnostics: "]
}

• 查看Livy界面提交作业的状态
  • 通过CM和Yarn的8088界面查看作业执行结果

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