On 07/14/14 09:35, Dave Cramer wrote: > Well distance pretty much translates into high rtt. I am talking about > Toronto to Mumbai or the equivalent
There was a substantial change in communication in version 2.2 where the data is pulled via the COPY protocol now as opposed to using a cursor and small FETCH operations. This reduces the number of round trips required especially when there is a backlog and the system starts grouping events together. You can relatively easy reproduce a WAN scenario in the laboratory using WANem, whe Wide Area Network Emulator. http://wanem.sourceforge.net/ The thing comes as a Knoppix image that is rather easy to set up in a virtual machine and use as a router between vlans. You can impose bandwidth limits, packet delay (round trip), packet loss, packet corruption, packet duplication, packet reordering, idle disconnects, random disconnects ... you get the picture. In my tests a cluster based on 2.2 is mostly affected by bandwidth and packet loss due to the delays that can introduce, leading to unused bandwidth. High round trip times (delay) are not much of an issue. Regards, Jan > > Dave Cramer > > > On 14 July 2014 09:29, Andrew Sullivan <[email protected] > <mailto:[email protected]>> wrote: > > I don't think "distance" is the problem. "High rtt links" might be > one, though: you can have cases where you time out or never catch up. > > -- > Andrew Sullivan > Please excuse my clumbsy thums. > > > On Jul 14, 2014, at 9:16, Dave Cramer <[email protected] > <mailto:[email protected]>> wrote: > > > > > > How well does this work. Does anyone have some real world > experience with this ? > > > > > > Dave Cramer > > _______________________________________________ > > Slony1-general mailing list > > [email protected] > <mailto:[email protected]> > > http://lists.slony.info/mailman/listinfo/slony1-general > > > > > _______________________________________________ > Slony1-general mailing list > [email protected] > http://lists.slony.info/mailman/listinfo/slony1-general > -- Jan Wieck Senior Software Engineer http://slony.info _______________________________________________ Slony1-general mailing list [email protected] http://lists.slony.info/mailman/listinfo/slony1-general
