Venkata, Thanks for the reply. Unfortunately something like PgPool still won't create the replication slots on all hosts, and record the LSN in a way that is reusable on the secondary.
This sort of puts logical decoding at odds with HA, correct? In the case of master failover, there's no way to: a) know where in the stream you read to, or b) convert that to something that can be understood by a replica that's about to be promoted. Are there any scheduled improvements here either for 9.6 or 9.7? Best, Colin On Sun, Aug 7, 2016 at 1:50 AM Venkata Balaji N <nag1...@gmail.com> wrote: > On Sat, Aug 6, 2016 at 1:17 PM, Colin Morelli <colin.more...@gmail.com> > wrote: > >> Hey all, >> >> I'm using logical decoding in my application to capture change streams >> and ship them to Kafka. However, logical replication slots aren't included >> in the WAL and thus don't make it to replicas. In the case of a failover, >> it's not clear what (if anything) can be done to continue receiving a >> change stream. >> >> I noticed there was a failover slot patch that looks like it won't be >> making it for 9.6 (if at all), but does anyone else have suggestions for >> handling failover + logical decoding? Is there an answer, or is it limited >> to being a very manual process for now? >> > > Yes, as of i know, It is a manual process for now. Another alternative you > can consider (if possible at all) would be a tool like PgPool-II which is > actually used for connection pooling, load balancing and automatic > failover. It may not make sense if you are do not wish to pool you > connections. > > Regards, > Venkata B N > > Fujitsu Australia >
