Apache Spark Ec2: could only be replicated to 0 nodes, instead of 1 - hadoop

Question

I have a 2Node cluster running on Ec2 d2.xlarge instance, and i have a 10 Gb of file to be processed through Spark, I have mounted a local Disk on spark and generated the Dataset o 10gb over there, but when I am trying to put that into Hdfs its throwing me the error of "could only be replicated to 0 nodes, instead of 1" as follows
16/03/09 21:44:25 WARN hdfs.DFSClient: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /vinit/inputfile.txt could only be replicated to 0 nodes, instead of 1
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1558)
at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:696)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)

Answer 1

Since your HDFS datanodes are not working and you have checked with jps command. You can configure the datanodes(slaves) by adding hostname or IP entries of datanodes to <HADOOP_HOME>/etc/hadoop/slaves file e.g.:
192.168.64.11
192.168.64.12
and similary for namenode (master) you can add entires to <HADOOP_HOME>/etc/hadoop/masters file e.g.: (assuming 192.168.64.11 is the master)
192.168.64.11
then run stop-all.sh and star-all.sh on master-node to restart the cluster. This will automatically start the datanodes. Check with jps command.