On 2020/03/20 15:22, Atsushi Torikoshi wrote:
On Fri, Mar 6, 2020 at 10:18 PM Fujii Masao <masao.fu...@oss.nttdata.com
<mailto:masao.fu...@oss.nttdata.com>> wrote:
OK, so patch attached.
This patch causes, if a promotion is triggered while recovery is paused,
the paused state to end and a promotion to continue. OTOH, this patch
makes pg_wal_replay_pause() and _resume() throw an error if it's executed
while a promotion is ongoing.
Regarding recovery_target_action, if the recovery target is reached
while a promotion is ongoing, "pause" setting will act the same as
"promote",
i.e., recovery will finish and the server will start to accept connections.
To implement the above, I added new shared varible indicating whether
a promotion is triggered or not. Only startup process can update this shared
variable. Other processes like read-only backends can check whether
promotion is ongoing, via this variable.
I added new function PromoteIsTriggered() that returns true if a promotion
is triggered. Since the name of this function and the existing function
IsPromoteTriggered() are confusingly similar, I changed the name of
IsPromoteTriggered() to IsPromoteSignaled, as more appropriate name.
I've confirmed the patch works as you described above.
And I also poked around it a little bit but found no problems.
Thanks for the review!
Barrying any objection, I will commit the patch.
Regards,
--
Fujii Masao
NTT DATA CORPORATION
Advanced Platform Technology Group
Research and Development Headquarters
