question Permission denied write group access help in Archives of Support Questions (Read Only)

Permission denied write group access help

2309188136 — Fri, 16 Sep 2022 10:51:24 GMT

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.

Re: Permission denied write group access help

sbomma — Fri, 16 Dec 2016 05:07:41 GMT

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.

Re: Permission denied write group access help

srementer — Fri, 16 Dec 2016 06:37:12 GMT

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

Re: Permission denied write group access help

2309188136 — Fri, 16 Dec 2016 11:41:57 GMT

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