Ошибка репликации данных в Hadoop

Я реализую кластер Hadoop Single Node Cluster на своем компьютере, следуя руководству Майкла Нолла и столкнулся с ошибкой репликации данных:

Вот полное сообщение об ошибке:

> hadoop@laptop:~/hadoop$ bin/hadoop dfs -copyFromLocal
> tmp/testfiles testfiles
> 
> 12/05/04 16:18:41 WARN hdfs.DFSClient: DataStreamer Exception:
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /user/hadoop/testfiles/testfiles/file1.txt could only be replicated to
> 0 nodes, instead of 1   at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1271)
>     at
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:422)
>     at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)  at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)     at
> org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)     at
> java.security.AccessController.doPrivileged(Native Method)  at
> javax.security.auth.Subject.doAs(Subject.java:396)  at
> org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> 
>     at org.apache.hadoop.ipc.Client.call(Client.java:740)   at
> org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)  at
> $Proxy0.addBlock(Unknown Source)    at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)     at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
>     at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
>     at $Proxy0.addBlock(Unknown Source)     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2937)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2819)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288)
> 
> 12/05/04 16:18:41 WARN hdfs.DFSClient: Error Recovery for block null
> bad datanode[0] nodes == null 12/05/04 16:18:41 WARN hdfs.DFSClient:
> Could not get block locations. Source file
> "/user/hadoop/testfiles/testfiles/file1.txt" - Aborting...
> copyFromLocal: java.io.IOException: File
> /user/hadoop/testfiles/testfiles/file1.txt could only be replicated to
> 0 nodes, instead of 1 12/05/04 16:18:41 ERROR hdfs.DFSClient:
> Exception closing file /user/hadoop/testfiles/testfiles/file1.txt :
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /user/hadoop/testfiles/testfiles/file1.txt could only be replicated to
> 0 nodes, instead of 1   at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1271)
>     at
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:422)
>     at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)  at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)     at
> org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)     at
> java.security.AccessController.doPrivileged(Native Method)  at
> javax.security.auth.Subject.doAs(Subject.java:396)  at
> org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> 
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /user/hadoop/testfiles/testfiles/file1.txt could only be replicated to
> 0 nodes, instead of 1   at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1271)
>     at
> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:422)
>     at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)  at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)     at
> org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)     at
> org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)     at
> java.security.AccessController.doPrivileged(Native Method)  at
> javax.security.auth.Subject.doAs(Subject.java:396)  at
> org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> 
>     at org.apache.hadoop.ipc.Client.call(Client.java:740)   at
> org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)  at
> $Proxy0.addBlock(Unknown Source)    at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)     at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
>     at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
>     at $Proxy0.addBlock(Unknown Source)     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2937)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2819)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2102)
>     at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2288)

Также, когда я выполняю :

bin/stop-all.sh

, в нем говорится, что узел данных не запущен и, следовательно, не может быть остановлен. Однако вывод jps говорит о наличии узла данных.

Я пытался отформатировать namenode , изменить разрешения владельца , но, похоже, это не сработало. Надеюсь, я не пропустил никакой другой важной информации.

Заранее спасибо.