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ae0ede6944
There is currently a risk to lose some WAL segments entirely in case archive_mode was set to 'on' before a promotion and there are some WALs with .ready files on the former leader we are trying to rewind. It happens because of the pg_rewind's modus operandi: it simply syncs the content of pg_wal directory of the old leader with the new leader's one. Including deletion of all WALs that are not present on the current leader, regardless their archive status on the former one. Thus, in case the new leader has already recycled such files, we just remove them entirely. In case archive_mode was set to 'always' and the .ready WALs are acrually present in archive, it is for end user who writes the archive_command to avoid overwritting and to properly test it. Co-authored-by: Alexander Kukushkin <[email protected]>