On 2020/04/08 16:41, movead...@highgo.ca wrote:
>> we should notice it in document I think.
There is the following explation about the relationship the recovery
pause and the promotion, in the document. You may want to add more
descriptions into the docs?
>------------------------------
If a promotion is triggered while recovery is paused, the paused
state ends and a promotion continues.
------------------------------
For example we can add this words:
First-time pg_wal_replay_pause() called during recovery which triggered
as promotion, pg_wal_replay_pause() show success but it did not really
pause the recovery.
I think this is not true. In your case, pg_wal_replay_pause() succeeded
because the startup process had not detected the promotion request yet
at that moment.
To cover your case, what about adding the following description?
-----------------
There can be delay between a promotion request by users and the trigger of
a promotion in the server. Note that pg_wal_replay_pause() succeeds
during that delay, i.e., until a promotion is actually triggered.
-----------------
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
