Hi all,
Use case : I am trying to add a new name node to already running federated cluster https://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/Federation.html#Adding_a_new_Namenode_to_an_existing_HDFS_cluster When I execute the refreshNamenodes($HADOOP_PREFIX/bin/hdfs dfsadmin -refreshNamenodes <datanode_host_name>:<datanode_rpc_port>) step, I am getting exception : HOST-10-19-92-85 is my new namenode to be added into cluster host-10-19-92-100 is the datanode in federated cluster At new name node : java.io.EOFException: End of File Exception between local host is: "HOST-10-19-92-85/10.19.92.85"; destination host is: "host-10-19-92-100":50010; : java.io.EOFException; For more details see: http://wiki.apache.org/hadoop/EOFException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792) at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:765) at org.apache.hadoop.ipc.Client.call(Client.java:1480) at org.apache.hadoop.ipc.Client.call(Client.java:1407) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229) at com.sun.proxy.$Proxy13.refreshNamenodes(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolTranslatorPB.refreshNamenodes(ClientDatanodeProtocolTranslatorPB.java:195) at org.apache.hadoop.hdfs.tools.DFSAdmin.refreshNamenodes(DFSAdmin.java:1919) at org.apache.hadoop.hdfs.tools.DFSAdmin.run(DFSAdmin.java:1825) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84) at org.apache.hadoop.hdfs.tools.DFSAdmin.main(DFSAdmin.java:1959) Caused by: java.io.EOFException at java.io.DataInputStream.readInt(DataInputStream.java:392) at org.apache.hadoop.ipc.Client$Connection.receiveRpcResponse(Client.java:1079) at org.apache.hadoop.ipc.Client$Connection.run(Client.java:974) At data node trying to refresh: 2015-04-01 16:11:31,720 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: host-10-19-92-100:50010:DataXceiver error processing unknown operation src: /10.19.92.85:43802 dst: /10.19.92.100:50010 java.io.IOException: Version Mismatch (Expected: 28, Received: 26738 ) at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.readOp(Receiver.java:60) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:225) at java.lang.Thread.run(Thread.java:745) I have cross verified the installation and jar versions. So the refreshNamenodes command is not working in my set up but as a workaround I found that restarting the datanode will add it to the newly added namenode Please help me out Regards Ajith
