I am currently stuck with hadoop namenode that won't start.

When I type "start-all.sh", everything prints out fine.
But when I type "jps", only JobTracker is activated.

When this happens, I usually format the namenode.

But the problem is that there are 500gigs of date in HDFS.
So I really want to save the data.

Can anyone give help please?

Could you check the NameNode/SecondaryNameNode logs and try to find
the exact issue? Post the errors (if) it contains here, so we can try
to help you better.

On Thu, Aug 5, 2010 at 9:39 AM, edward choi <[EMAIL PROTECTED]> wrote:
> I am currently stuck with hadoop namenode that won't start.
>
> When I type "start-all.sh", everything prints out fine.
> But when I type "jps", only JobTracker is activated.
>
> When this happens, I usually format the namenode.
>
> But the problem is that there are 500gigs of date in HDFS.
> So I really want to save the data.
>
> Can anyone give help please?
>

--
Harsh J
www.harshj.com

I've fixed the problem.

The reason namenode won't start was that I accidentally started the cluster
with root account.
This somehow changed the ownership of some hadoop-related files(ex: log
files, and hadoop.tmp.dir/dfs/name/current/edits) from hadoop:hadoop to
root:root.
After I fixed the ownership issue, everything went fine.
Thanks for the concern.

2010/8/5 Harsh J <[EMAIL PROTECTED]>

> Could you check the NameNode/SecondaryNameNode logs and try to find
> the exact issue? Post the errors (if) it contains here, so we can try
> to help you better.
>
> On Thu, Aug 5, 2010 at 9:39 AM, edward choi <[EMAIL PROTECTED]> wrote:
> > I am currently stuck with hadoop namenode that won't start.
> >
> > When I type "start-all.sh", everything prints out fine.
> > But when I type "jps", only JobTracker is activated.
> >
> > When this happens, I usually format the namenode.
> >
> > But the problem is that there are 500gigs of date in HDFS.
> > So I really want to save the data.
> >
> > Can anyone give help please?
> >
>
>
>
> --
> Harsh J
> www.harshj.com
>