> Having said that, I do think we urgently need some high-level design
> discussion on how sync rep is actually going to handle this issue
> (perhaps on a new thread). If we can't resolve this issue, sync rep
> is going to be really slow; but there are no easy solutions to this
> problem in sight, so if we want to have sync rep for 9.1 we'd better
> agree on one of the difficult solutions soon so that work can begin.
>
When standbys reconnect after a crash, they could send the
ahead-of-the-master WAL to the master. This is an alternative to
choosing the most-ahead standby as the new master, as suggested
elsewhere.
Greetings
Marcin Mańk