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 < arkoprovomukher...@gmail.com> 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 <donta...@gmail.com> > 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 > > <arkoprovomukher...@gmail.com> 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 <cba...@sdl.com> 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:arkoprovomukher...@gmail.com] > >> > Sent: Wednesday, February 13, 2013 11:32 AM > >> > To: hdfs-user@hadoop.apache.org > >> > 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 > >> > SDL Enterprise Technologies, Inc. - all rights reserved. The > >> > information contained in this email may be confidential and/or legally > >> > privileged. It has been sent for the sole use of the intended > recipient(s). > >> > If you are not the intended recipient of this mail, you are hereby > notified > >> > that any unauthorized review, use, disclosure, dissemination, > distribution, > >> > or copying of this communication, or any of its contents, is strictly > >> > prohibited. If you have received this communication in error, please > reply > >> > to the sender and destroy all copies of the message. > >> > Registered address: 201 Edgewater Drive, Suite 225, Wakefield, MA > 01880, > >> > USA > >> > > > > > >
