> If the primary node 'comes back' after the primary node failure would you expect the new value to propagate to all nodes?
I don't think so, but I'm not 100% sure - could you ask about this specific case in a separate thread? On Tue, Jul 25, 2023 at 8:50 AM Raymond Wilson <raymond_wil...@trimble.com> wrote: > >> However, if a primary node fails before at least 1 backup > node receives an update, then the update will be lost, and all nodes will > have the old value. > > Does this imply that it is a good idea to have the FullSync write > synchronization mode? If the primary node 'comes back' after the primary > node failure would you expect the new value to propagate to all nodes? > > > On Tue, Jul 25, 2023 at 5:22 PM Pavel Tupitsyn <ptupit...@apache.org> > wrote: > >> > if a hard failure occurs to one of the backup servers in the replicated >> cache will the server that failed have an inconsistent (old) copy of that >> element in the replicated cache when it restarts >> >> If only a backup server fails and restarts, it will get new data from the >> primary node, no issue here. >> However, if a primary node fails before at least 1 backup node receives >> an update, then the update will be lost, and all nodes will have the old >> value. >> >> Related: CacheConfiguration.ReadFromBackup property is true by default, >> meaning that with PrimarySync it is possible to get old value from a backup >> node after an update, before backups receive new data. >> >> On Mon, Jul 24, 2023 at 11:51 PM Raymond Wilson < >> raymond_wil...@trimble.com> wrote: >> >>> Hi Pavel, >>> >>> I understand the differences between the sync modes in terms of when the >>> write returns. What I want to understand is if there are consistency risks >>> with the PrimarySync versus FullSync modes. >>> >>> For example, if I have 4 nodes participating in the replicated cache >>> (and am using the default PrimarySync mode), then the write will return >>> once the primary node in the replicated cache has completed the write. At >>> that point if a hard failure occurs to one of the backup servers in the >>> replicated cache will the server that failed have an inconsistent (old) >>> copy of that element in the replicated cache when it restarts? >>> >>> Raymond. >>> >>> > > -- > <http://www.trimble.com/> > Raymond Wilson > Trimble Distinguished Engineer, Civil Construction Software (CCS) > 11 Birmingham Drive | Christchurch, New Zealand > raymond_wil...@trimble.com > > > <https://worksos.trimble.com/?utm_source=Trimble&utm_medium=emailsign&utm_campaign=Launch> >
