So is that picture incorrect, or just incomplete missing the piece on how the nodes reply to the coordinator node.
On Tue, Feb 11, 2014 at 9:38 AM, sankalp kohli <kohlisank...@gmail.com>wrote: > @Mullen, > I think your diagram does not answer the question on responses. > @Sameer > All nodes in DC2 will replay back to the co-ordinator in DC1. So if you > have replication of DC1:3,DC2:3. A co-ordinator node will get 6 responses > back if it is not in the replica set. > Hope that answers your question. > > > On Tue, Feb 11, 2014 at 8:16 AM, Mullen, Robert <robert.mul...@pearson.com > > wrote: > >> I had the same question a while back and put together this picture to >> help me understand the flow of data for multi region deployments. Hope that >> it helps. >> >> >> On Mon, Feb 10, 2014 at 7:52 PM, Sameer Farooqui >> <sam...@blueplastic.com>wrote: >> >>> Hi, >>> >>> I was hoping someone could clarify a point about multi-DC replication. >>> >>> Let's say I have 2 data centers configured with replication factor = 3 >>> in each DC. >>> >>> My client app is sitting in DC 1 and is able to intelligently pick a >>> coordinator that will also be a replica partner. >>> >>> So the client app sends a write with consistency for DC1 = Q and >>> consistency for DC2 = Q to a coordinator node in DC1. >>> >>> That coordinator in DC1 forwards the write to 2 other nodes in DC1 and a >>> coordinator in DC2. >>> >>> Is it correct that all 3 nodes in DC2 will respond back to the original >>> coordinator in DC1? Or will the DC2 nodes respond back to the DC2 >>> coordinator? >>> >>> Let's say one of the replica nodes in DC2 is down. Who will hold the >>> hint for that node? The original coordinator in DC1 or the coordinator in >>> DC2? >>> >> >> >
