Hadoop error: Noroutetohostexception:no route to host

This error often occurs when the user uploads data to the HDFS

Hdfs. Dfsclient:exception in Createblockoutputstream java.net.NoRouteToHostException:No route to host

In this case, the online solution is usually to tell the firewall to be turned off, as for which host firewall does not mention.

View log file, only say no route to host does not mention the port, the solution is all the host shutdown firewall, Namenode and slave node to shut down. This is still true if you only shut down the firewall on the host of Namenode.

#service iptables Stop

Or

#chkconfig iptables On/off