救！An internal error occurred during: "Map/Reduce location status updater"

eclipse上运行Map/Reduce插件报错，hadoop运行起来看上去没什么问题
An internal error occurred during: "Map/Reduce location status updater".
Cannot read the array length because "jobs" is null

配置文件
core-site-xml:

```xml
<configuration>  
    <property>
      <name>hadoop.tmp.dir</name>
      <value>/D:/hadoop-2.8.3/data</value>
    </property>
    <property>
      <name>fs.defaultFS</name>
      <value>hdfs://localhost:9000</value>
    </property>
</configuration>

hdfs-site-xml:

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>/D:/hadoop-2.8.3/data/namenode</value>
    </property>
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>/D:/hadoop-2.8.3/data/datanode</value>
    </property>
<property>
<name>dfs.namenode.http-address</name>
<value>0.0.0.0:50070</value>
<description>
The address and the base port where the dfs namenode web ui will listen on.
</description>
</property>
<property>
            <name>dfs.datanode.address</name>
            <value>0.0.0.0:50010</value>
               <!-- Default Port: 50010. -->
    </property>
    <property>
            <name>dfs.datanode.http.address</name>
            <value>0.0.0.0:50075</value>
               <!-- Default Port: 50075. -->
    </property>
    <property>
            <name>dfs.datanode.ipc.address</name>
            <value>0.0.0.0:50020</value>
               <!-- Default Port: 50020. -->
    </property>
    <property>
            <name>dfs.secondary.http.address</name>
            <value>0.0.0.0:50090</value>
               <!-- Default Port: 50090. -->
    </property>

<property>
  <name>dfs.http.address</name>
  <value>localhost:9870</value>
</property>
</configuration>

yarn-site-xml:

<configuration>
     <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
    <property>
        <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
        <value>org.apache.hahoop.mapred.ShuffleHandler</value>
    </property>


</configuration>

mapred-site-xml:

<configuration>
     <property>
            <name>mapreduce.framework.name</name>
             <value>yarn</value>
    </property>
    <property>
        <name>mapred.job.tracker</name>
        <value>localhost:9001</value>
                <!-- Default Port: 9001. -->
    </property>
    <property>
            <name>mapred.job.tracker.http.address</name>
            <value>0.0.0.0:50030</value>
                <!-- Default Port: 50030. -->
    </property>

    <property>
        <name>mapred.task.tracker.http.address</name>
        <value>0.0.0.0:50060</value>
                <!-- Default Port: 50060. -->
    </property>

</configuration>

```

出现这个错误是你hdfs上的文件是空的，你只需要
hadoop fs -mkdir /input/
创建一个文件就不会报错了。

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