FWIW, Y! and LI (and I'm sure others) have been using failover A records for years. The only known problem/limitation is exactly what Dhruba states.
On Jan 29, 2011, at 11:19 PM, Dhruba Borthakur wrote: > If you want to protect urself against a rack-switch failure, then you would > want to keep ur primary and standby on machines in different racks. > Typically, machines in different racks have different subnets. > > thanks > dhruba > > On Wed, Jan 26, 2011 at 7:10 AM, mac fang <mac.had...@gmail.com> wrote: > >> Hi, dhruba, >> >> Thanks for sharing. Seems we only need to let NameNode & Backup Node in the >> same subnet. Why it is a main problem? >> >> regards >> macf >> >> On Wed, Jan 26, 2011 at 4:14 PM, Harsh J <qwertyman...@gmail.com> wrote: >> >>> Thank you for correcting that :) >>> >>> On Wed, Jan 26, 2011 at 11:17 AM, Dhruba Borthakur <dhr...@gmail.com> >>> wrote: >>>> Fb does not use the VIP approach, we tried that but quickly found out >>> some >>>> limitations, one main problem being that the failover server pair has >> to >>> be >>>> in the same subnet (for VIP to work). Instead we now use the AvatarNode >>>> integrated with Zookeeper. >>>> >>>> -dhruba >>>> >>>> On Tue, Jan 25, 2011 at 6:12 PM, Harsh J <qwertyman...@gmail.com> >> wrote: >>>> >>>>> This is a good approach, is used by many to mask the NameNode address >>>>> for the DataNodes; and is also good to use while using BackupNode >>>>> (Even Facebook does this). >>>>> >>>>> On Wed, Jan 26, 2011 at 7:38 AM, mac fang <mac.had...@gmail.com> >> wrote: >>>>>> Hi, guys, >>>>>> >>>>>> Do we have any plan to enable VIP between NameNode and DataNodes, I >>> mean >>>>>> multiple NameNodes and we use a VIP stands before the NNs. Then DNs >>> only >>>>>> need to connect to the VIP. I don't know if it is valuable we have >>> this >>>>> impl >>>>>> in our hdsf and if there has any issues? >>>>>> >>>>>> Any hints are valuable for me. :) >>>>>> >>>>>> regards >>>>>> macf >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Harsh J >>>>> www.harshj.com >>>>> >>>> >>>> >>>> >>>> -- >>>> Connect to me at http://www.facebook.com/dhruba >>>> >>> >>> >>> >>> -- >>> Harsh J >>> www.harshj.com >>> >> > > > > -- > Connect to me at http://www.facebook.com/dhruba