Hey Arko. It should be safe to delete then. -Chuck
-----Original Message----- From: Arko Provo Mukherjee [mailto:arkoprovomukher...@gmail.com] Sent: Friday, February 15, 2013 11:56 AM To: hdfs-user@hadoop.apache.org Subject: Re: Managing space in Master Node Hello Charles, Thanks a lot for your reply and help! Yes, the NN data (image, edit files) is kept separate from the data files. "dfs.name.dir=/hadoop/hdfs/name" whereas "dfs.data.dir=/hadoop/hdfs/data". Their contents match with the description you specified Can I safely go ahead and delete all contents from the data dir? Thanks & regards Arko On Thu, Feb 14, 2013 at 8:16 PM, Charles Baker <cba...@sdl.com> wrote: > Hey Arko. Glad to hear it worked out for you. Just make sure that your > NN's image and edit files aren't also (perhaps inadvertently) stored > in that directory structure. The NameNode image/edit dir contains the following: > > drwxr-xr-x 2 hdfs hdfs 4096 Feb 14 17:48 current drwxr-xr-x 2 hdfs > hdfs 4096 Jul 17 2012 image > -rw-r--r-- 1 hdfs hdfs 0 Sep 27 12:28 in_use.lock > drwxr-xr-x 2 hdfs hdfs 4096 Sep 17 23:25 previous.checkpoint > > whereas, the DN data dir should contain: > > drwxr-xr-x 2 hdfs hdfs 57344 Feb 14 14:04 blocksBeingWritten > drwxr-xr-x 66 hdfs hdfs 8192 Jan 22 02:44 current > drwxr-xr-x 2 hdfs hdfs 6 Aug 10 2012 detach > -rw-r--r-- 1 hdfs hdfs 0 Sep 27 11:19 in_use.lock > -rw-r--r-- 1 hdfs hdfs 157 Aug 10 2012 storage > drwxr-xr-x 2 hdfs hdfs 6 Feb 4 17:34 tmp > > > It's a good practice to locate the JobTracker and SecondaryNameNode > services on a different machine than the NN. If you have an > opportunity to do so, I recommend getting a separate machine for those two services as well. > > -Chuck > > > -----Original Message----- > From: Arko Provo Mukherjee [mailto:arkoprovomukher...@gmail.com] > Sent: Thursday, February 14, 2013 4:21 PM > To: hdfs-user@hadoop.apache.org > Subject: Re: Managing space in Master Node > > Hello Everyone - I have decommissioned my NN so that only the > JobTracker, NameNode and SecondaryNameNodes are running on it now. > I would like to thank everyone who helped me to perform this task! > > I have just one more issue: The data files created in the Master Node > seem to be still there. in /hdfs/data/current Now that this server is > not being used as a DataNode, can I safely delete the files under this > folder to clear up space? > > Thanks & regards > Arko > > On Thu, Feb 14, 2013 at 11:48 AM, Arko Provo Mukherjee > <arkoprovomukher...@gmail.com> wrote: >> Thanks! I have already requested for downtime. Will do the changes soon! >> Warm regards >> Arko >> >> On Thu, Feb 14, 2013 at 3:31 AM, <ramon....@accenture.com> wrote: >>> Hi Arko. >>> >>> Only thing you need to do is not running the TaskTracker and >>> DataNode > demons on your master machine. Ensure you do not have this on your > slaves file con hadoop's config directory when you start the system. > I'm supposing you are on Open Source release. For other distributions > look at its documentation about how to remove those demons from your master node machine. >>> >>> >>> -----Original Message----- >>> From: Arko Provo Mukherjee [mailto:arkoprovomukher...@gmail.com] >>> Sent: miércoles, 13 de febrero de 2013 20:32 >>> 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 >>> >>> >>> This message is for the designated recipient only and may contain > privileged, proprietary, or otherwise private information. 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