On Thu, Jan 7, 2016 at 12:20 AM, Alvaro Herrera
> Vladimir Borodin wrote:
>> There are situations in which vacuuming big btree index causes stuck
>> in WAL replaying on hot standby servers for quite a long time. I’ve
>> described the problem in more details in this thread . Below in
>> that thread Kevin Grittner proposed a good way for improving btree
>> scans so that btree vacuuming logic could be seriously simplified.
>> Since I don’t know when that may happen I’ve done a patch that makes
>> some improvement right now. If Kevin or someone else would expand 
>> for handling all types of btree scans, I suppose, my patch could be
>> thrown away and vacuuming logic should be strongly rewritten.
> You submitted this patch in May 2015 -- and 7 months later, Simon came
> up with another patch that's supposed to fix the underlying problem, so
> that this shouldn't be a problem anymore.
> Would you please have a look at Simon's patch, in particular verify
> whether it solves the performance dip in your testing environment?
> (Note there's an updated patch a few emails down the thread.)
> If it seems to fix the problem for you, I think we should mark yours
> rejected and just apply Simon's.
Simon's patch (justly) does not update lastBlockVacuumed in the case
of toast indexes, but Vladimir's patch would still optimize this case,
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