Hi Abhishek, 1. Use multiple directories for *dfs.name.dir* & *dfs.data.dir* etc * Recommendation: write to *two local directories on different physical volumes*, and to an *NFS-mounted* directory – Data will be preserved even in the event of a total failure of the NameNode machines * Recommendation: *soft-mount the NFS* directory – If the NFS mount goes offline, this will not cause the NameNode to fail
2. *Rack awareness* https://issues.apache.org/jira/secure/attachment/12345251/Rack_aware_HDFS_proposal.pdf On Thu, Apr 12, 2012 at 2:18 AM, Abhishek Pratap Singh <manu.i...@gmail.com>wrote: > Thanks Robert. > Is there a best practice or design than can address the High Availability > to certain extent? > > ~Abhishek > > On Wed, Apr 11, 2012 at 12:32 PM, Robert Evans <ev...@yahoo-inc.com> > wrote: > > > No it does not. Sorry > > > > > > On 4/11/12 1:44 PM, "Abhishek Pratap Singh" <manu.i...@gmail.com> wrote: > > > > Hi All, > > > > Just wanted if hadoop supports more than one data centre. This is > basically > > for DR purposes and High Availability where one centre goes down other > can > > bring up. > > > > > > Regards, > > Abhishek > > > > > -- Thanks & Regards ---- *Manu S* SI Engineer - OpenSource & HPC Wipro Infotech Mob: +91 8861302855 Skype: manuspkd www.opensourcetalk.co.in
