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At the end of recovery for the post-promotion process, a new history file is created followed by the last partial segment of the previous timeline. Based on the timing, the archiver would first try to archive the last partial segment and then the history file. This can delay the detection of a new timeline taken, particularly depending on the time it takes to transfer the last partial segment as it delays the moment the history file of the new timeline gets archived. This can cause promoted standbys to use the same timeline as one already taken depending on the circumstances if multiple instances look at archives at the same location. This commit changes the order of archiving so as history files are archived in priority over other file types, which reduces the likelihood of the same timeline being taken (still not reducing the window to zero), and it makes the archiver behave more consistently with the startup process doing its post-promotion business. Author: David Steele Reviewed-by: Michael Paquier, Kyotaro Horiguchi Discussion: https://postgr.es/m/929068cf-69e1-bba2-9dc0-e05986aed471@pgmasters.net Backpatch-through: 9.5 |
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