Pretty sure data is sent to the coordinating node in DC2 at the same time it is sent to replicas in DC1, so I would think 10's of milliseconds after the transport time to DC2.
On Nov 16, 2011, at 3:48 PM, ehers...@gmail.com wrote: > On a related note - assuming there are available resources across the board > (cpu and memory on every node, low network latency, non-saturated > nics/circuits/disks), what's a reasonable expectation for timing on > replication? Sub-second? Less than five seconds? > > Ernie > > On Wed, Nov 16, 2011 at 4:00 PM, Brian Fleming <bigbrianflem...@gmail.com> > wrote: > Great - thanks Jake > > B. > > On Wed, Nov 16, 2011 at 8:40 PM, Jake Luciani <jak...@gmail.com> wrote: > the former > > > On Wed, Nov 16, 2011 at 3:33 PM, Brian Fleming <bigbrianflem...@gmail.com> > wrote: > > Hi All, > > I have a question about inter-data centre replication : if you have 2 Data > Centers, each with a local RF of 2 (i.e. total RF of 4) and write to a node > in DC1, how efficient is the replication to DC2 - i.e. is that data : > - replicated over to a single node in DC2 once and internally replicated > or > - replicated explicitly to two separate nodes? > > Obviously from a LAN resource utilisation perspective, the former would be > preferable. > > Many thanks, > > Brian > > > > > -- > http://twitter.com/tjake > >
