On Jul 30, 2008, at 20:35, Raghu Angadi wrote:
You should always have more than one location (preferably on
different disks) for fsimage and editslog.
On production we do frequent backups. Is there a mechanism from inside
hadoop now to do something like that now? The "more than one location"
bit sounds a little like that.
A few months back I had a proposal to keep checksums for each record
on fsimage and editslog and NameNode would recover transparently
from such corruptions when there are more than one copies available.
It didn't come up in priority since there were no such failures
observed.
You should certainly report these cases and will help the feature
gain more traction.
Will file a bug report tomorrow.
cheers
--
Torsten
