On 9/23/11 9:46 AM, "Harsh J" <[email protected]> wrote: >Ivan, > >On Fri, Sep 23, 2011 at 9:22 PM, <[email protected]> wrote: >[snip] >> Which parameter are you referring to? I am planning on using 2 >>directories >> in dfs.name.dir, one is local and the other is an NFS mount of a 2nd >> machine running the secondary namenode. > >I'm slightly confused here. Do you mean to say a 'SecondaryNameNode', >which is a form of checkpointing daemon available as part of Hadoop, >or do you mean to say, loosely, 'secondary namenode', which would >imply a machine that can step in as a NameNode once you start it (in >case the primary fails)? > >For the former, the properties are the ones that begin with >"fs.checkpoint.*" in 0.20.x versions, which you can checkout.
I mean both... A 2nd node which can step in as a name node and also that node will run the checkpointing daemon. I have 2 directories in dfs.name.dir one is local and one is remote on the 2nd machine so we have a copy of the data if we lose the first machine. Cheers, Ivan
