我在VMware上部署了Hadoop集群。它们都运行在CentOS 7上。
在Master节点上执行命令“jps”：
在Master节点上执行命令“jps”：
[root@hadoopmaster anna]# jps
6225 NameNode
6995 ResourceManager
6580 SecondaryNameNode
7254 Jps
在从节点上执行jps命令：
[root@hadoopslave1 anna]# jps
5066 DataNode
5818 Jps
5503 NodeManager
然而，我不知道为什么 http://localhost:50070/dfshealth.html#tab-overview 上的活跃节点显示为0。我无法使用hdfs dfs -put上传文件f1，并出现错误信息：
[root@hadoopmaster hadoop]# hdfs dfs -put in/file/f1 /user
16/01/06 02:53:14 WARN hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user._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.getNewBlockTargets(FSNamesystem.java:3110)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3034)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:723)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:492)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)
at org.apache.hadoop.ipc.Client.call(Client.java:1476)
at org.apache.hadoop.ipc.Client.call(Client.java:1407)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:418)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy10.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1430)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1226)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)
put: File /user._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.
我尝试过其他帖子，比如
rm -R /tmp/*
请检查ssh
在主节点上：
[root@hadoopmaster hadoop]# ssh hadoopmaster
Last login: Wed Jan 6 02:56:27 2016 from hadoopslave1
[root@hadoopmaster ~]# exit
logout
Connection to hadoopmaster closed.
[root@hadoopmaster hadoop]# ssh hadoopslave1
Last login: Wed Jan 6 02:43:21 2016
[root@hadoopslave1 ~]# exit
logout
Connection to hadoopslave1 closed.
[root@hadoopmaster hadoop]#
在从机上：
[root@hadoopslave1 .ssh]# ssh hadoopmaster
Last login: Wed Jan 6 03:04:45 2016 from hadoopmaster
[root@hadoopmaster ~]# exit
logout
Connection to hadoopmaster closed.
[root@hadoopslave1 .ssh]# ssh hadoopslave1
Last login: Wed Jan 6 03:04:40 2016 from hadoopmaster
[root@hadoopslave1 ~]# exit
logout
Connection to hadoopslave1 closed.
[root@hadoopslave1 .ssh]#