hadoop put命令不好使

装完hadoop2.6.0-cdh5.5.2后put命令不好使，并且装完hive后导入本地数据也报错，put命令一直报这个错：

hadoop@debian:~$ hadoop fs -put he.tt /aaa

17/01/02 23:37:52 WARN hdfs.DFSClient: DataStreamer Exceptionorg.apache.hadoop.ipc.RemoteException(java.io.IOException): File /aaa/he.tt._COPYING_ 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.        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1550)        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3286)        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:676)        at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.addBlock(AuthorizationProviderProxyClientProtocol.java:212)        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:483)        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1060)        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)        at java.security.AccessController.doPrivileged(Native Method)        at javax.security.auth.Subject.doAs(Subject.java:415)        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)        at org.apache.hadoop.ipc.Client.call(Client.java:1466)        at org.apache.hadoop.ipc.Client.call(Client.java:1403)        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)        at com.sun.proxy.$Proxy14.addBlock(Unknown Source)        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:399)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:606)        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:256)        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)        at com.sun.proxy.$Proxy15.addBlock(Unknown Source)        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1674)        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1471)        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:668)put: File /aaa/he.tt._COPYING_ 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.

这个报错折磨了我好几天，最后才发现在装hadoop的时候主机名必须修改，我一开始认为不修改也没事，为了图方便就没改直接用的IP地址

解决：

vi /etc/hosts （3节点都修改，可以把初始内容都删掉后添加如下内容）
192.168.8.11    h11
192.168.8.12    h12
192.168.8.13    h13

vi /etc/hostname （主节点，其他节点类似）
h11

reboot  （3节点都重启）