On Tue, Jul 25, 2017 at 1:42 PM, Alvaro Herrera
> As I see it, we need to backpatch at least parts of this patch. I've
> received reports that in earlier branches pglogical and BDR can
> sometimes leave slots behind when removing nodes, and I have a hunch
> that it can be explained by the bugs being fixed here. Now we cannot
> use condition variables in back-branches, so we'll need to figure out
> how to actually do it ...
If all you had to back-patch was the condition variable code itself,
that might not really be all that bad, but it depends on the
WaitEventSet stuff, which I think is far too dangerous to back-patch.
However, you might be able to create a dumber, slower version that
only uses WaitLatch.
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