我只是通过运行wordcount示例来测试hadoop，但出现了以下错误：

14/07/30 12:03:02 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your   
platform... using builtin-java classes where applicable
14/07/30 12:03:03 INFO client.RMProxy: Connecting to ResourceManager at /127.0.0.1:8032
14/07/30 12:03:04 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:8032. Already     
tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 
SECONDS)
14/07/30 12:03:05 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:8032. Already   
tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 
SECONDS)

互联网上的一些人认为这是因为yarn-site.xml文件。我的是：

<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.hadoop.mapred.ShuffleHandler</value>
    </property>
    <property>
      <name>yarn.scheduler.minimum-allocation-mb</name>
      <value>128</value>
      <description>Minimum limit of memory to allocate to each container request at the Resource     
      Manager.</description>
    </property>
    <property>
      <name>yarn.scheduler.maximum-allocation-mb</name>
      <value>1024</value>
      <description>Maximum limit of memory to allocate to each container request at the Resource 
      Manager.</description>
    </property>
    <property>
      <name>yarn.scheduler.minimum-allocation-vcores</name>
      <value>1</value>
      <description>The minimum allocation for every container request at the RM, in terms of 
      virtual CPU cores. Requests lower than this won't take effect, and the specified value will 
      get allocated the minimum.</description>
    </property>
    <property>
      <name>yarn.scheduler.maximum-allocation-vcores</name>
      <value>2</value>
      <description>The maximum allocation for every container request at the RM, in terms of 
      virtual CPU cores. Requests higher than this won't take effect, and will get capped to this 
      value.</description>
    </property>
    <property>
      <name>yarn.nodemanager.resource.memory-mb</name>
      <value>2048</value>
      <description>Physical memory, in MB, to be made available to running containers</description>
    </property>
    <property>
      <name>yarn.nodemanager.resource.cpu-vcores</name>
      <value>2</value>
      <description>Number of CPU cores that can be allocated for containers.</description>
    </property>

    <property>
      <name>yarn.nodemanager.aux-services</name>
      <value>mapreduce_shuffle</value>
    </property>

我上周运行了一些程序，效果很好，所以我真的不知道发生了什么。谢谢你的帮助。