12 jul 2014 kl. 12:33 skrev Andres Freund <andres@xxxxxxxxxxxxxxx>: > On 2014-07-12 18:22:30 +0800, Craig Ringer wrote: >> On 07/12/2014 02:24 PM, Martin Gudmundsson wrote: >>> Any ideas giving BDR an option to be synchronous. I mean in ”close quarters” with low latency it should work ok. >> >> BDR doesn't do synchronous replication _yet_, but it's on the roadmap. > > Just to clarify: There's two things that sometimes are referred to as > 'synchronous' in the context of multimaster replication. > > Just like with HS' builtin synchronous replication it can mean that the > client doesn't get a reply until the COMMIT has safely been replicated > to other systems. That's supported by BDR today. Would that be to a streaming replication synchronous standby? I.e replicated to a read only node? > The more complex thing is support for performing transactions that, when > the COMMIT returns successfully, can't have conflicts. That's *not* yet > supported, but we're thinking of implementing it for individual > transactions. > > Greetings, > > Andres Freund > > -- > Andres Freund http://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Training & Services
