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Permission denied write group access help

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Permission denied write group access help

New Contributor

10326-hdfs-group-write-issue.jpg

Hi everyone,

I'm a new user of HDP2.3. I have setup a cluster of 3 nodes (one name node and 2 datanodes).

How come linux user xdl <group:hadoop> can't write to hdfs directory /xdl/tests, owned by the exact same group hadoop?

Please help me to understand.

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Re: Permission denied write group access help

New Contributor

Run "hdfs groups xdl3" ... this will show you the hdfs groups associated with that user. If xdl3 is not in the hadoop group in hdfs, then it will not be able to write under that directory.

To sync hdfs group mappings with linux group mappings:

1. Run "sudo useradd <username> -g <hadoop_gid>" on all 3 hadoop servers

2. Run "hdfs dfsadmin -refreshUserToGroupsMappings" on one of the servers

3. Run "hdfs groups xdl3" to view the change

Hope this helps

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Re: Permission denied write group access help

Expert Contributor

sudo su - hdfs, then execute your commands. the xdl3 user does not have write access to /xdl/tmp directory.

Also i hope you dont have any acls setup.

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Re: Permission denied write group access help

New Contributor

Run "hdfs groups xdl3" ... this will show you the hdfs groups associated with that user. If xdl3 is not in the hadoop group in hdfs, then it will not be able to write under that directory.

To sync hdfs group mappings with linux group mappings:

1. Run "sudo useradd <username> -g <hadoop_gid>" on all 3 hadoop servers

2. Run "hdfs dfsadmin -refreshUserToGroupsMappings" on one of the servers

3. Run "hdfs groups xdl3" to view the change

Hope this helps

View solution in original post

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Re: Permission denied write group access help

New Contributor

Thanks for the workaround. This has solved my group-access problem.

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