(this is unrelated to the other discussion about this patch)
On 29.01.2013 02:07, Simon Riggs wrote:
Fast promote mode skips checkpoint at end of recovery. pg_ctl promote -m fast will skip the checkpoint at end of recovery so that we can achieve very fast failover when the apply delay is low. Write new WAL record XLOG_END_OF_RECOVERY to allow us to switch timeline correctly for downstream log readers. If we skip synchronous end of recovery checkpoint we request a normal spread checkpoint so that the window of re-recovery is low.
It just occurred to me that it would be really nice if the end-of-recovery record, and the timeline-switching shutdown checkpoint record too for that matter, would include the previous timeline's ID that we forked from, in addition to the new TLI. Although it's not required for anything at the moment, it would be useful debugging information. It would allow reconstructing timeline history files from the WAL; that might come handy.
Barring objections, I'll add that. - Heikki -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
