https://community.cloudera.com/t5/Support-Questions/Exception-in-createBlockOutputStream/m-p/23824#M53150 &gt; java.net.NoRouteToHostException: No route to host<BR /><BR />This shows the network connection failed. You'd have to check the switch/router in between the hosts or if all hosts are connecting to each other with consistent host names and IP addresses.<BR /><BR />Do you use DNS or /etc/hosts? Sat, 17 Jan 2015 23:48:32 GMT GautamG 2015-01-17T23:48:32Z