On Thu, Sep 17, 2020 at 10:20:16AM +0200, Oleksandr Shulgin wrote: > Ouch. I think pg_rewind shouldn't try to remove any random files in pg_wal > that it doesn't know about. > What if the administrator made a backup of some WAL segments there?
IMO, this would be a rather bad strategy anyway, so just don't do that, because that could also mean that this is on the same partition as pg_wal/ which would crash the server if the partition has the idea to get full even if max_wal_size is set correctly. If you think about that, this is rather similar to putting tablespaces in your root data folder: it may look fancy, but you just make the task of the backend more complicated. Note that this practice is not wise when Postgres decides to apply actions that loop across the entire tree, just to name two of them: the full fsync of PGDATA at the beginning of crash recovery or just a base backup. -- Michael
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