Permission denied at hdfs

Question

I am new to hadoop distributed file system  I have done complete installation of hadoop single node on my machine but after that when i am going to upload data to hdfs it give an error message Permission Denied   Message from terminal with command   hduser ubuntu  usr local hadoop  hadoop fs -put  usr local input-data   input put   usr local input-data  Permission denied   hduser ubuntu  usr local hadoop     After using sudo and adding hduser to sudouser   hduser ubuntu  usr local hadoop  sudo bin hadoop fs -put  usr local input-data   inwe put  org apache hadoop security AccessControlException  Permission denied  user root  access WRITE  inode    hduser supergroup rwxr-xr-x  hduser ubuntu  usr local hadoop

User · Answer

For Hadoop 3 x  if you try to create a file on HDFS when unauthenticated  e g  user dr who  you will get this error   It is not recommended for systems that need to be secure  however if you d like to disable file permissions entirely in Hadoop 3 the hdfs-site xml setting has changed to    lt property gt     lt name gt dfs permissions enabled lt  name gt     lt value gt false lt  value gt   lt  property gt    https   hadoop apache org docs stable hadoop-project-dist hadoop-hdfs hdfs-default xml

User · Answer

Start a shell as hduser  from root  and run your command  sudo -u hduser bash hadoop fs -put  usr local input-data   input    update  Also note that the hdfs user is the super user and has all r w privileges

User · Answer

I had similar situation and here is my approach which is somewhat different    HADOOP USER NAME hdfs hdfs dfs -put  root MyHadoop file1 txt     What you actually do is you read local file in accordance to your local permissions but when placing file on HDFS you are authenticated like user hdfs  You can do this with other ID  beware of real auth schemes configuration but this is usually not a case    Advantages    Permissions are kept on HDFS  You don t need sudo  You don t need actually appropriate local user  hdfs  at all  You don t need to copy anything or change permissions because of previous points

User · Answer

You are experiencing two separate problems here     hduser ubuntu  usr local hadoop  hadoop fs -put  usr local input-data   input put   usr local input-data  Permission denied    Here  the user hduser does not have access to the local directory  usr local input-data  That is  your local permissions are too restrictive  You should change it     hduser ubuntu  usr local hadoop  sudo bin hadoop fs -put  usr local input-data   inwe put  org apache hadoop security AccessControlException  Permission denied  user root  access WRITE  inode    hduser supergroup rwxr-xr-x   Here  the user root  since you are using sudo  does not have access to the HDFS directory  input  As you can see  hduser supergroup rwxr-xr-x says only hduser has write access  Hadoop doesn t really respect root as a special user     To fix this  I suggest you change the permissions on the local data   sudo chmod -R og rx  usr local input-data    Then  try the put command again as hduser

User · Answer

I solved this problem temporary by disabling the dfs permission By adding below property code to conf hdfs-site xml   lt property gt     lt name gt dfs permissions lt  name gt     lt value gt false lt  value gt   lt  property gt

User · Answer

I ve solved this problem by using following steps  su hdfs hadoop fs -put  usr local input-data   input exit

[shell] Permission denied at hdfs

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