版本：
HadoopCDH5.0
异常描述：
部署hadoop yarn的时候报RuntimeException，信息如下：
java.lang.RuntimeException: Although a UNIX domain socket path is configured as /var/run/hadoop-hdfs/dn._PORT, we cannot start a localDataXceiverServer because libhadoop cannot be loaded.
问题原因：
hadoop cdh5的native lib没有，解决方式是去官方下载:
资源根路径：http://archive-primary.cloudera.com/cdh5/
RPM：hadoop-2.2.0+cdh5.0.0+1610-0.cdh5b2.p0.51.el5.x86_64.rpm
然后参考
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http://snv.iteye.com/blog/2030429
解压cp即可