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Date: Thu, 12 Feb 2009 10:14:26 +0530
From: Amar Kamat <amarrk@yahoo-inc.com>
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To: core-user@hadoop.apache.org
Subject: Re: Hadoop setup questions
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bjday wrote:
> Good morning everyone,
>
> I have a question about correct setup for hadoop.  I have 14 Dell 
> computers in a lab.   Each connected to the internet and each 
> independent of each other.  All run CentOS.  Logins are handled by 
> NIS.  If userA logs into the master and starts the daemons and UserB 
> logs into the master and wants to run a job while the daemons from 
> UserA are still running the following error occurs:
>
> copyFromLocal: org.apache.hadoop.security.AccessControlException: 
> Permission denied: user=UserB, access=WRITE, 
> inode="user":UserA:supergroup:rwxr-xr-x
Looks like one of your files (input or output) is of different user. 
Seems like your DFS has permissions enabled. If you dont require 
permissions then disable it else make sure that the input/output paths 
are under your permission (/user/userB is the hone directory for userB).
Amar
>
> what needs to be changed to allow UserB-UserZ to run their jobs?  Does 
> there need to be a local user the everyone logs into as and run from 
> there?  Should Hadoop be ran in an actual cluster instead of 
> independent computers?  Any ideas what is the correct configuration 
> settings that allow it?
>
> I followed Ravi Phulari suggestions and followed:
>
> http://hadoop.apache.org/core/docs/current/quickstart.html
> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_(Multi-Node_Cluster) 
> <http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Multi-Node_Cluster%29> 
>
> http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_(Single-Node_Cluster) 
> <http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Single-Node_Cluster%29> 
>
>
> These allowed me to get Hadoop running on the 14 computers when I 
> login and everything works fine, thank you Ravi.  The problem occurs 
> when additional people attempt to run jobs simultaneously.
>
> Thank you,
>
> Brian
>