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From Shahnawaz Saifi <shahsa...@gmail.com>
Subject Re: problem regarding the hadoop
Date Fri, 01 Jul 2011 07:05:21 GMT
You can create multiple users on Cluster because it follows LSM (Linux
security model). But Hadoop related process NN, DN, JT, TT need to be
started with one user e.g. hadoop.

Thanks,
Shah

On Fri, Jul 1, 2011 at 4:57 AM, Mitra Kaseebhotla <
mitra.kaseebhotla@gmail.com> wrote:

> Not to divert the question here. I would like to know how we should manage
> the cluster users (I am a newbie)? insead of having one user(hadoop) creds
> shared?
>
> Thanks
> Mitra.
>
> On Thu, Jun 30, 2011 at 4:23 PM, Paul Rimba <paul.rimba@gmail.com> wrote:
>
> > sudo chown -R hadoop:hadoop /usr/local/hadoop.
> > That will give the directory ownership over to your hadoop account.
> >
> > On Fri, Jul 1, 2011 at 5:07 AM, Dhruv Kumar <dkumar@ecs.umass.edu>
> wrote:
> >
> > > It is a permission issue. Are you sure that the account "hadoop" has
> read
> > > and write access to /usr/local/* directories?
> > >
> > > The installation of Hadoop has always been effortless for me. Just
> follow
> > > the instructions step by step given on:
> > > http://hadoop.apache.org/common/docs/stable/single_node_setup.html
> > >
> > >
> > >
> > >
> > > On Thu, Jun 30, 2011 at 11:08 AM, Ashish Tamrakar
> > > <ashishtamrakar@gmail.com>wrote:
> > >
> > > > I am having a problem starting my hadoop. i setup my for my
> single-node
> > > > cluster. please help me to solve this out!!!!
> > > >
> > > > hadoop@ashishpc:~$ /usr/local/hadoop/bin/start-all.sh
> > > > starting namenode, logging to
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-namenode-ashishpc.out
> > > > /usr/local/hadoop/bin/hadoop-daemon.sh: line 117:
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-namenode-ashishpc.out:
> > > > Permission denied
> > > > head: cannot open
> > > > `/usr/local/hadoop/bin/../logs/hadoop-hadoop-namenode-ashishpc.out'
> for
> > > > reading: No such file or directory
> > > > localhost: starting datanode, logging to
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-datanode-ashishpc.out
> > > > localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 117:
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-datanode-ashishpc.out:
> > > > Permission denied
> > > > localhost: head: cannot open
> > > > `/usr/local/hadoop/bin/../logs/hadoop-hadoop-datanode-ashishpc.out'
> for
> > > > reading: No such file or directory
> > > > localhost: starting secondarynamenode, logging to
> > > >
> > >
> >
> /usr/local/hadoop/bin/../logs/hadoop-hadoop-secondarynamenode-ashishpc.out
> > > > localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 117:
> > > >
> > >
> >
> /usr/local/hadoop/bin/../logs/hadoop-hadoop-secondarynamenode-ashishpc.out:
> > > > Permission denied
> > > > localhost: head: cannot open
> > > >
> > > >
> > >
> >
> `/usr/local/hadoop/bin/../logs/hadoop-hadoop-secondarynamenode-ashishpc.out'
> > > > for reading: No such file or directory
> > > > starting jobtracker, logging to
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-jobtracker-ashishpc.out
> > > > /usr/local/hadoop/bin/hadoop-daemon.sh: line 117:
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-jobtracker-ashishpc.out:
> > > > Permission denied
> > > > head: cannot open
> > > > `/usr/local/hadoop/bin/../logs/hadoop-hadoop-jobtracker-ashishpc.out'
> > for
> > > > reading: No such file or directory
> > > > localhost: starting tasktracker, logging to
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-tasktracker-ashishpc.out
> > > > localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 117:
> > > > /usr/local/hadoop/bin/../logs/hadoop-hadoop-tasktracker-ashishpc.out:
> > > > Permission denied
> > > > localhost: head: cannot open
> > > >
> `/usr/local/hadoop/bin/../logs/hadoop-hadoop-tasktracker-ashishpc.out'
> > > for
> > > > reading: No such file or directory
> > > >
> > >
> >
>
>
>
> --
>  ________________________________________
>
>  To Understand Recursion,
>  You must first Understand Recursion
>  ________________________________________
>

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