我正在大学项目中使用hadoop，我正在构建一个用于演示的应用程序。我决定使用restapi，因为我将远程演示。我正在尝试使用json查询运行“wordcount”示例，它似乎运行得很好。
我的问题是为什么hadoop要启动两个应用程序，见图：

我提交了申请：“申请书”然后另一个开始。这种行为正常吗？还有什么。进度条一直没有以18.2%的速度移动，最终失败
下面是我使用的json查询

{
  "application-id": "application_1471255114270_0082",
  "application-name": "wordcount",
  "am-container-spec": {
    "local-resources": {
      "entry": [{
        "key": "hadoop-mapreduce-examples.jar",
        "value": {
          "resource": "hdfs://10.2.45.38:8020/applications/MapReduce/hadoop-mapreduce-examples.jar",
          "type": "FILE",
          "visibility": "APPLICATION",
          "size": "273458",
          "timestamp": "1470646121574"
        }
      }]
    },
    "commands": {
      "command": "/usr/java/jdk1.7.0_71/bin/java -Xmx10m org.apache.hadoop.util.RunJar hadoop-mapreduce-examples.jar wordcount hdfs://10.2.45.38:8020/demo.txt hdfs://10.2.45.38:8020/output  1>/tmp/mrtest.stdout 2>/tmp/mrtest.stderr"
    },
    "environment": {
      "entry": [{
        "key": "CLASSPATH",
        "value": "/usr/hdp/2.3.4.7-4/hadoop/etc/hadoop<CPS>/usr/hdp/2.3.4.7-4/hadoop/*<CPS>/usr/hdp/2.3.4.7-4/hadoop/lib/*<CPS>/usr/hdp/2.3.4.7-4/hadoop/client/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-mapreduce/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-mapreduce/lib/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-hdfs/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-hdfs/lib/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-yarn/*<CPS>/usr/hdp/2.3.4.7-4/hadoop-yarn/lib/*<CPS>/lib/*"
      }]
    }
  },
  "unmanaged-AM": "false",
  "max-app-attempts": "2",
  "resource": {
    "memory": "1024",
    "vCores": "1"
  },
  "application-type": "MAPREDUCE",
  "keep-containers-across-application-attempts": "false"
}

谢谢你的时间。