写个yarn的监控

在星球里和微信群里很多朋友都有疑惑，如何监控 yarn 上 spark 或者 mr 应用的存活状态，浪尖今天在这里分享一下实现方法，实际上只需要简单的几行代码即可。

首先是，pom文件，添加yarn相关的配置

代码语言：javascript复制

<!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common -->
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-common</artifactId>
      <version>2.7.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client -->
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-client</artifactId>
      <version>2.7.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-yarn-api -->
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-yarn-api</artifactId>
      <version>2.7.4</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-yarn-client -->
    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-yarn-client</artifactId>
      <version>2.7.4</version>
    </dependency>

接着将yarn-site.xml配置文件放到resources目录下：

具体实现代码其实很简单就是，通过yarnclient获取resourcemanager上 spark 或者 mapreduce的状态。

代码语言：javascript复制

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.ApplicationReport;
import org.apache.hadoop.yarn.api.records.YarnApplicationState;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;

import java.io.IOException;
import java.util.EnumSet;
import java.util.List;


public class client {
    public static void main(String[] args){
        Configuration conf = new YarnConfiguration();
        YarnClient yarnClient = YarnClient.createYarnClient();
        yarnClient.init(conf);
        yarnClient.start();
        try {
            List<ApplicationReport> applications = yarnClient.getApplications(EnumSet.of(YarnApplicationState.RUNNING, YarnApplicationState.FINISHED));
            System.out.println("ApplicationId ============> " applications.get(0).getApplicationId());
            System.out.println("name ============> " applications.get(0).getName());
            System.out.println("queue ============> " applications.get(0).getQueue());
            System.out.println("queue ============> " applications.get(0).getUser());
        } catch (YarnException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        yarnClient.stop();
    }
}

可以看到，我们可以通过YarnApplicationState设置状态，来过滤调一些我们不需要的任务状态。状态列表如下：

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public enum YarnApplicationState {
  /** Application which was just created. */
  NEW,

  /** Application which is being saved. */
  NEW_SAVING,

  /** Application which has been submitted. */
  SUBMITTED,

  /** Application has been accepted by the scheduler */
  ACCEPTED,

  /** Application which is currently running. */
  RUNNING,

  /** Application which finished successfully. */
  FINISHED,

  /** Application which failed. */
  FAILED,

  /** Application which was terminated by a user or admin. */
  KILLED
}

上述demo监控的是spark streaming 的状态，运行结果如下：

这样，我们通过app name字段可以获取到存活的 spark 等任务，然后通过比对我们要监控的任务列表，不存在的发出告警即可。

对于 spark streaming 或者 spark其他任务，可以通过一个配置来制定spark 任务在yarn上显示的name，设置的参数是

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new SparkConf().setAppName(this.getClass.getName)

this.getClass.getName该方式在yarn-client和 yarn-cluster有稍微的区别，具体可以测一下。

类名作为spark app的 name 还是很方便及便于识别的。

yarn

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