Hi Paolo, The checkpoint is stored in the database at source and target, so couchdb will fail to find that document on server B and so it will start from update sequence 0.
B. On 16 April 2013 10:06, Paolo Negri <hungrybl...@gmail.com> wrote: > Hi Robert > > On Tue, Apr 16, 2013 at 10:05 AM, Robert Newson <rnew...@apache.org> wrote: >> Hi Paolo, >> >> No, couchdb (and touchdb) will be just fine if you fail over to a >> different server. What will happen is that the replication from server >> B to your mobile client will start from update sequence 0 (as you will >> have no previous checkpoint). > > I'm wondering what happens if the fallback is not explicit to the > client let's say I have the database exposed under > https://mydomain.com/mydatabase and under this url usually respond > server A but after the failover requests are instead forwarded > internally to server B won't the mobile client be looking for the > checkpoint of server A and be confused about the fact of being talking > with server B instead? > >> The replication process will then check >> whether each update on server B is on your client already. If the A to >> B replication is still running, then the majority of updates you get >> from server B will already be present on your mobile device. Any that >> are missing will be replicated. >> >> You can freely replicate from multiple servers to your mobile client, it >> works. >> >> B. >> >> On 16 April 2013 08:43, Paolo Negri <hungrybl...@gmail.com> wrote: >>> Dear list >>> >>> I have a question related to couchdb replication, let me walk you >>> through the scenario >>> >>> I have 2 servers server A and server B >>> >>> on both A and B I'm running couchdb >>> B is configured to replicate all dbs from A >>> >>> I also have one mobile client that uses touchdb to sync data with one >>> database on server A >>> >>> At some point server A breaks and then the mobile client can't reach A >>> and then will fallback to B >>> >>> What happens in terms of syncing? will the mobile client be confused >>> by the fact that the database on server B doesn't share sequence >>> numbers with the same database in A? >>> >>> Thanks for your help, >>> >>> Paolo
