Greetings, * Bruce Momjian (br...@momjian.us) wrote: > On Wed, Dec 30, 2020 at 12:52:46PM -0800, Andres Freund wrote: > > A question from a colleague made me wonder if there are scenarios where > > two subsequent crashes could lead to wrong WAL to be applied. > > > > Imagine the following scenario > > [ xlog page 1 ][ xlog page 2 ][ xlog page 3 ][ xlog page 4 ] > > ^flush ^write ^insert > > > > if the machine crashes in this moment, we could end up with a situation > > where page 1, 3, 4 made it out out to disk, but page 2 wasn't. > > I don't see any flaw in your logic. Seems we have to zero out all > future WAL files, not just to the end of the current one, or at least > clear xlp_pageaddr on each future page.
I've wondered before if we should be doing a timeline switch at the end of crash recovery... Thanks, Stephen
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