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: > > 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 > > >
