Ian, Good point. Srivas was responding to Todd's question, but there might be better fora as you suggest.
We have a good one for specific questions about MapR at http://answers.mapr.com That doesn't, however, really provide a useful forum for questions like Todd's which really spans both domains. Where would you suggest for questions that span the two subjects? On Thu, Jun 30, 2011 at 9:47 PM, Ian Holsman <[email protected]> wrote: > >> If MapR does something fancier, I'm sure we'd be interested to hear > about > >> it > >> so we can compare the approaches. > >> > >> -Todd > >> > >> > > MapR tracks disk responsiveness. In other words, a moving histogram of > > IO-completion times is maintained internally, and if a disk starts > getting > > really slow, it is pre-emptively taken offline so it does not create long > > tails for running jobs (and the data on the disk is re-replicated using > > whatever re-replication policy is in place). One of the benefits of > > managing the disks directly instead of through ext3 / xfs / or other ... > > > > All these stats can be fed into Ganglia (or pushed out centrally via a > text > > file that can be pulled out using NFS) if historical info about disk > > behavior (and failures) needs to be preserved. > > > > - Srivas. > > While I am intrigued about how MapR performs internally, I don't think this > is the forum for it. > please keep MapR (and other vendor specific discussions) on their > respective support forums. >
