Re: [HACKERS] WIP: long transactions on hot standby feedback replica/ proof of concept

Hello. I made some bugfixes and rewrite the patch.

Simon Riggs писал 2017-09-05 14:44:
> As Alexander says, simply skipping truncation if standby is busy isn't
> a great plan.
> 
> If we defer an action on standby replay, when and who will we apply
> it? What happens if the standby is shutdown or crashes while an action
> is pending.

After crash standby server will go to the nearest checkout and will 
replay
all his wal`s to reach consistent state and then open for read-only 
load.
(all collected wal`s will be replayed in right way, I meant wal`s that
truncates table and wal`s that make table grow)

-- 
Ivan Kartyshov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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