异常信息：
main : run as user is hdfs
main : requested yarn user is hdfs
Can't create directory /data1/yarn/nm/usercache/hdfs/appcache/application_xxx - Permission denied
Can't create directory /data2/yarn/nm/usercache/hdfs/appcache/application_xxx - Permission denied
Did not create any app directories
异常背景：
CDH版本6.2.x
原本CDH集群中没有启用kerberos，并且使用hdfs用户提交过任务到yarn，后来启用kerberos后再提交任务时报此异常
解决方案：
将每个NodeManager节点上用户对应的缓存目录删除，例如：/data1/yarn/nm/usercache/hdfs和/data2/yarn/nm/usercache/hdfs，之后再重新提交任务
