安装CDH5 hadoop2.3.0 NodeManager 没有启动

 今天在安装hadoop后，启动start-yarn.sh后，nodemanager起不起来，后来查看DN节点的日志，报了如下一个错误：

FATAL org.apache.hadoop.yarn.server.nodemanager.NodeManager: Error starting NodeManager  
java.lang.IllegalArgumentException: The ServiceName: mapreduce.shuffle set in yarn.nodemanager.aux-services is invalid.The valid service name should only  
 contain a-zA-Z0-9_ and can not start with numbers

解决办法：
修改yarn-site.xml文件:

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

是因为yarn.nodemanager.aux-services配置错误致使。