could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.

stop all hadoop services
delete dfs/name and dfs/data directories
hadoop namenode -format # Answer with a capital Y
start hadoop services

출처 : https://stackoverflow.com/questions/5293446/hdfs-error-could-only-be-replicated-to-0-nodes-instead-of-1