hadoop "File /user/<user>/input/conf/slaves could only be replicated to 0 nodes, instead of 1"问题及解决办...

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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 1 at 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$DataStreamer.run(DFSClient.java:2446) 11/10/20 08:18:22 WARN hdfs.DFSClient: Error Recovery for block null bad datanode[0] nodes == null 11/10/20 08:18:22 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/fkong/input/conf/slaves" - Aborting... put: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 1 11/10/20 08:18:22 ERROR hdfs.DFSClient: Exception closing file /user/fkong/input/conf/slaves : org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/fkong/input/conf/slaves could only be replicated to 0 nodes, instead of 1 at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417) at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:596) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.ipc.RPC$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 1 at 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