hadoop "File /user//input/conf/slaves could only be replicated to 0 nodes,

760176104

　　本文地址：http://blog.csdn.net/kongxx/article/details/6892675

　　安装hadoop的官方文档安装后，在伪分布式模式下运行

　　bin/hadoop fs -put conf input
　　出现以下异常
11/10/20 08:18:22 WARN hdfs.DFSClient: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 1at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)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.ipc.RPC$Server.call(RPC.java:523)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:396)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)at org.apache.hadoop.ipc.Client.call(Client.java:1030)at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:224)at $Proxy1.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 $Proxy1.addBlock(Unknown Source)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3104)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2975)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)11/10/20 08:18:22 WARN hdfs.DFSClient: Error Recovery for block null bad datanode[0] nodes == null11/10/20 08:18:22 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/fkong/input/conf/slaves" - Aborting...put: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 111/10/20 08:18:22 ERROR hdfs.DFSClient: Exception closing file /user/fkong/input/conf/slaves : org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 1at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:523)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:396)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 1at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596)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.ipc.RPC$Server.call(RPC.java:523)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1383)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1379)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:396)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1377)at org.apache.hadoop.ipc.Client.call(Client.java:1030)at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:224)at $Proxy1.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 $Proxy1.addBlock(Unknown Source)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3104)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2975)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)Exit 255检查了一下发现是由于默认的hadoop.tmp.dir的路径为/tmp/hadoop-${user.name},而我的linux系统的/tmp目录文件系统的类型往往是Hadoop不支持的。所以这里就需要更改一下hadoop.tmp.dir的路径到别的地方，这里指定到hadoop的安装路径下的一个子目录。具体步骤如下：
　　1. 修改${HADOOP_HOME}/conf/core-site.xml文件，修改后文件内如如下：
<configuration><property><name>hadoop.tmp.dir</name><value>/data/fkong/hadoop-0.20.203.0/hadoop-${user.name}</value></property><property><name>fs.default.name</name><value>hdfs://localhost:9000</value></property></configuration>2. 重新启动hadoop的daemon$ bin/start-all.sh　　3. 再次运行以下命令就不会再有异常出现了
$ bin/hadoop fs -put conf input
　　另外也有些别的情况会导致这个问题，具体可以参考Hadoop:could only be replicated to 0 nodes, instead