Hadoop 异常解决

java.io.IOException: File /user/root/input 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/root/input 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)

原因：Configured Capacity也就是datanode 没用分配容量

  [root@dev9106 bin]# ./hadoop dfsadmin -report

Configured Capacity: 0 (0 KB)   

Present Capacity: 0 (0 KB)

DFS Remaining: 0 (0 KB)

DFS Used: 0 (0 KB)

DFS Used%: ?%

Under replicated blocks: 0

Blocks with corrupt replicas: 0

Missing blocks: 0

解决方法：

1. 查看你的文件系统

[root@dev9106 /]# df -hl

文件系统              容量  已用 可用 已用% 挂载点

/dev/sda3             1.9G  1.6G  302M  84% /

/dev/sda8             845G   47G  756G   6% /home

/dev/sda7             5.7G  147M  5.3G   3% /tmp

/dev/sda6             9.5G  4.0G  5.1G  45% /usr

/dev/sda5             9.5G  273M  8.8G   3% /var

/dev/sda1             190M   15M  167M   8% /boot

tmpfs                 7.8G     0  7.8G   0% /dev/shm

2. 修改文件Hadoop conf/core-site.xml 中hadoop.tmp.dir的值

  <property>

   <name>fs.default.name</name>

   <value>hdfs://localhost:9000</value>

</property>

<property>

   <name>hadoop.tmp.dir</name>

   <value>/home/dhfs/tmp</value>

</property>

</configuration>

3. 停止hadoop服务，重新格式化namenode

4.重启服务

5.Ok

2. 运行hadoop程序时， 中途我把它终止了，然后再向hdfs加文件或删除文件时，出现Name node is in safe mode错误： 
rmr: org.apache.hadoop.dfs.SafeModeException: Cannot delete /user/hadoop/input. Name node is in safe mode 

 

解决的命令： 

bin/hadoop dfsadmin -safemode leave  关闭safe mode