Hi, Does NN log anywhere saying that 'one of DN is down and not reachable,so replicating damaged DN data to another DN'?
Thanks On Wed, Dec 11, 2013 at 2:10 PM, Jitendra Yadav <[email protected]>wrote: > Yes you are right. It will periodically checks the under replicated blocks > information and place those blocks on available data nodes if required. > > Regards > Jitendra > > > On Wed, Dec 11, 2013 at 1:57 PM, oc tsdb <[email protected]> wrote: > >> Hi, >> >> Thanks for your response. >> >> You mean NN will always try to maintain number of replicas as configured >> even if one DN goes down and unable to come up? >> >> Thanks >> -OC >> >> >> >> On Mon, Dec 9, 2013 at 8:18 PM, Daryn Sharp <[email protected]> wrote: >> >>> To recover a NN, you probably want to use the HA feature. If not, try >>> writing your edits to a nfs volume in additional to the local fs. >>> >>> There is no need to recover a DN. The NN compensates for a lost DN by >>> using the other remaining replicas to create a new replica on another DN. >>> >>> Daryn >>> >>> On Dec 9, 2013, at 5:52 AM, oc tsdb <[email protected]> wrote: >>> >>> > Hi, >>> > >>> > I am trying to understand,how to recover a Name node or Data node >>> failure in case if those nodes are unable to come up due to unexpected >>> issues. >>> > >>> > Is there a way to replace Name node with new name node without loosing >>> data.I mean new Name node should have all the data from original Name node. >>> > Similarly for Data node. >>> > >>> > >>> > Thanks >>> > -OC >>> > >>> > >>> >>> >> >
