前一陣子搭建好了windows下的hadoop開發環境，今天進行遠程執行時報了一個異常：

14/02/26 10:33:52 WARNmapred.LocalJobRunner: job_local_0001

org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=weixiang, access=WRITE,inode="":root:supergroup:rwxr-xr-x

??? atsun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

??? atsun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

??? atsun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

??? atjava.lang.reflect.Constructor.newInstance(Unknown Source)

??? atorg.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:95)

??? atorg.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:57)

??? atorg.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:1428)

??? atorg.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:332)

??? atorg.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1126)

??? atorg.apache.hadoop.mapred.FileOutputCommitter.setupJob(FileOutputCommitter.java:52)

??? atorg.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:186)

Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.security.AccessControlException: Permission denied: user=weixiang, access=WRITE,inode="":root:supergroup:rwxr-xr-x

??? atorg.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:199)

??? atorg.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.check(FSPermissionChecker.java:180)

??? atorg.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:128)

??? atorg.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:5468)

??? atorg.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:5442)

??? atorg.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:2209)

??? atorg.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:2178)

??? atorg.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:857)

??? atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

??? atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

??? atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

??? atjava.lang.reflect.Method.invoke(Method.java:597)

??? atorg.apache.hadoop.ipc.RPC$Server.call(RPC.java:578)

??? atorg.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1393)

??? atorg.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1389)

??? atjava.security.AccessController.doPrivileged(Native Method)

??? atjavax.security.auth.Subject.doAs(Subject.java:396)

??? atorg.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)

??? atorg.apache.hadoop.ipc.Server$Handler.run(Server.java:1387)

?

??? atorg.apache.hadoop.ipc.Client.call(Client.java:1107)

??? atorg.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)

??? at$Proxy1.mkdirs(Unknown Source)

??? atsun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

??? atsun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

??? atsun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

??? atjava.lang.reflect.Method.invoke(Unknown Source)

??? atorg.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)

??? atorg.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62)

??? at$Proxy1.mkdirs(Unknown Source)

??? atorg.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:1426)

??? ...4 more

14/02/26 10:33:53 INFOmapred.JobClient:? map 0% reduce 0%

14/02/26 10:33:53 INFOmapred.JobClient: Job complete: job_local_0001

14/02/26 10:33:53 INFO mapred.JobClient:Counters: 0

可以看出是權限不足的問題，通過網上翻閱資料，找到了一個經測試可行的辦法；

解決方案：在Hadoop集群的hdfs-site.xml文件中添加以下節點

<property>

???<name>dfs.permissions</name>

???<value>false</value>

?</property>

?

重啟hadoop集群即可

總結

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