NoRouteToHostException
错误描述：
INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.net.NoRouteToHostException: No route to host
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解决办法：是防火墙的问题
关闭systemctl stop firewalld.service(所有集群中的防火墙都要关闭)
Check system time and time zones
错误描述：
Got exception: org.apache.hadoop.yarn.exceptions.YarnException: Unauthorized request to start container.
This token is expired. current time is 1468846669832 found 1468814870801
Note: System times on machines may be out of sync. Check system time and time zones.
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解决办法：
date -s '2016-07-18 12:07:00'
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centos7时间设置补充：
查看时间状态：timedatectl
设 置 时 间：timedatectl set-time “YYYY-MM-DD HH:MM:SS”
列 出 时 区：timedatectl list-timezones
设 置 时 区：timedatectl set-timezone Asia/Shanghai
是否NTP服务器同步：timedatectl set-ntp yes
将硬件时钟调整为与本地时钟一致：timedatectl set-local-rtc 1