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Re: Managing space in Master Node
Just don't run the DN daemon on that machine. Dedicate that machine to NN.
Remove the hostname of the NN machine from the 'slaves' file.

Warm Regards,
Tariq
https://mtariq.jux.com/
cloudfront.blogspot.com
On Thu, Feb 14, 2013 at 1:31 AM, Arko Provo Mukherjee <
[EMAIL PROTECTED]> wrote:

> Hi,
>
> Thanks for the help!
>
> However, I am still unsure about how to "turn off" the datanode
> feature on the NN.
>
> I checked the "hdfs-site.xml" file and the dfs.data.dir is pointed to
> a directory.
>
> Should I just comment out that property? What would happen to the
> current data that there is in the Master? Will it get removed
> automatically?
>
> Thanks & regards
> Arko
>
>
>
> On Wed, Feb 13, 2013 at 1:55 PM, Mohammad Tariq <[EMAIL PROTECTED]>
> wrote:
> > You can specify the logging level as specified by Charles. But turning
> logs
> > off is never a good idea. Logs are really helpful in problem diagnosis,
> > which are eventual.
> >
> > Warm Regards,
> > Tariq
> > https://mtariq.jux.com/
> > cloudfront.blogspot.com
> >
> >
> > On Thu, Feb 14, 2013 at 1:22 AM, Arko Provo Mukherjee
> > <[EMAIL PROTECTED]> wrote:
> >>
> >> Hi,
> >>
> >> Yeah, my NameNode is also seconding as a DataNode.
> >>
> >> I would like to "turn off" this feature.
> >>
> >> Request help regarding the same.
> >>
> >> Thanks & regards
> >> Arko
> >>
> >> On Wed, Feb 13, 2013 at 1:38 PM, Charles Baker <[EMAIL PROTECTED]> wrote:
> >> > Hi Arko. Sounds like you may be running a DataNode on the NameNode
> which
> >> > is
> >> > not recommended practice. Normally, the only files the NN stores are
> the
> >> > image and edits files. It does not store any actual HDFS data. If you
> >> > must
> >> > run a DN on the NN, try turning down the logging in
> >> > /conf/log4j.properties:
> >> >
> >> > #hadoop.root.logger=INFO,console
> >> > #hadoop.root.logger=WARN,console
> >> > hadoop.root.logger=ERROR,console
> >> >
> >> > Depending on the logging information you require, of course.
> >> >
> >> > -Chuck
> >> >
> >> >
> >> > -----Original Message-----
> >> > From: Arko Provo Mukherjee [mailto:[EMAIL PROTECTED]]
> >> > Sent: Wednesday, February 13, 2013 11:32 AM
> >> > To: [EMAIL PROTECTED]
> >> > Subject: Managing space in Master Node
> >> >
> >> > Hello Gurus,
> >> >
> >> > I am managing a Hadoop Cluster to run some experiments.
> >> >
> >> > The issue I am continuously facing is that the Master Node runs out of
> >> > disk
> >> > space due to logs and data files.
> >> >
> >> > I can monitor and delete log files. However, I cannot delete the HDFS
> >> > data.
> >> >
> >> > Thus, is there a way to force Hadoop not to save any HDFS data in the
> >> > Master
> >> > Node?
> >> >
> >> > Then I can use my master to handle the metadata only and store the
> logs.
> >> >
> >> > Thanks & regards
> >> > Arko
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