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HDFS >> mail # user >> RE: Permission problem


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Kevin Burton 2013-04-30, 14:55
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Arpit Gupta 2013-04-30, 15:01
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Kevin Burton 2013-04-30, 15:22
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Arpit Gupta 2013-04-30, 15:47
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Mohammad Tariq 2013-04-30, 17:06
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Kevin Burton 2013-04-30, 13:36
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Re: Permission problem
what is your mapred.system.dir set to in mapred-site.xml?

By default it will write to /tmp on hdfs.

So you can do the following

create /tmp on hdfs and chmod it to 777 as user hdfs and then restart jobtracker and tasktrackers.

In case its set to /mapred/something then create /mapred and chown it to user mapred.
--
Arpit Gupta
Hortonworks Inc.
http://hortonworks.com/

On Apr 30, 2013, at 6:36 AM, "Kevin Burton" <[EMAIL PROTECTED]> wrote:

> To further complicate the issue the log file in (/var/log/hadoop-0.20-mapreduce/hadoop-hadoop-jobtracker-devUbuntu05.log) is owned by mapred:mapred and the name of the file seems to indicate some other lineage (hadoop,hadoop). I am out of my league in understanding the permission structure for hadoop hdfs and mr. Ideas?
>  
> From: Kevin Burton [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 30, 2013 8:31 AM
> To: [EMAIL PROTECTED]
> Cc: 'Mohammad Tariq'
> Subject: RE: Permission problem
>  
> That is what I perceive as the problem. The hdfs file system was created with the user ‘hdfs’ owning the root (‘/’) but for some reason with a M/R job the user ‘mapred’ needs to have write permission to the root. I don’t know how to satisfy both conditions. That is one reason that I relaxed the permission to 775 so that the group would also have write permission but that didn’t seem to help.
>  
> From: Mohammad Tariq [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 30, 2013 8:20 AM
> To: Kevin Burton
> Subject: Re: Permission problem
>  
> user?"ls" shows "hdfs" and the log says "mapred"..
>
> Warm Regards,
> Tariq
> https://mtariq.jux.com/
> cloudfront.blogspot.com
>  
>
> On Tue, Apr 30, 2013 at 6:22 PM, Kevin Burton <[EMAIL PROTECTED]> wrote:
> I have relaxed it even further so now it is 775
>  
> kevin@devUbuntu05:/var/log/hadoop-0.20-mapreduce$ hadoop fs -ls -d /
> Found 1 items
> drwxrwxr-x   - hdfs supergroup          0 2013-04-29 15:43 /
>  
> But I still get this error:
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> 2013-04-30 07:43:02,520 FATAL org.apache.hadoop.mapred.JobTracker: org.apache.hadoop.security.AccessControlException: Permission denied: user=mapred, access=WRITE, inode="/":hdfs:supergroup:drwxrwxr-x
>  
>  
> From: Mohammad Tariq [mailto:[EMAIL PROTECTED]]
> Sent: Monday, April 29, 2013 5:10 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Incompartible cluserIDS
>  
> make it 755.
>
> Warm Regards,
> Tariq
> https://mtariq.jux.com/
> cloudfront.blogspot.com
>  
>
>  

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Kevin Burton 2013-04-30, 14:39