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Continuation of work started in commit 15a79c73, after initial trial.
Author: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/b936d2fb-590d-49c3-a615-92c3a88c6c19%40eisentraut.org
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Backpatch-through: 13
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size_t is the size of an object in memory, not the size of a file on disk.
Thanks to Tom Lane for noting the error.
Discussion: http://postgr.es/m/1865585.1727803933@sss.pgh.pa.us
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Make the wordings of some file-related error messages more like those
used in other files.
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Before this patch, if you took a full backup on server A and then
tried to use the backup manifest to take an incremental backup on
server B, it wouldn't know that the manifest was from a different
server and so the incremental backup operation could potentially
complete without error. When you later tried to run pg_combinebackup,
you'd find out that your incremental backup was and always had been
invalid. That's poor timing, because nobody likes finding out about
backup problems only at restore time.
With this patch, you'll get an error when trying to take the (invalid)
incremental backup, which seems a lot nicer.
Amul Sul, revised by me. Review by Michael Paquier.
Discussion: http://postgr.es/m/CA+TgmoYLZzbSAMM3cAjV4Y+iCRZn-bR9H2+Mdz7NdaJFU1Zb5w@mail.gmail.com
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pg_combinebackup had various problems:
* strncpy was used in various places where strlcpy should be used
instead, to avoid any possibility of the result not being
\0-terminated.
* scan_for_existing_tablespaces() failed to close the directory,
and an error when opening the directory was reported with the
wrong pathname.
* write_reconstructed_file() contained some redundant and therefore
dead code.
* flush_manifest() didn't check the result of pg_checksum_update()
as we do in other places, and misused a local pathname variable
that shouldn't exist at all.
In pg_basebackup, the wrong variable name was used in one place,
due to a copy and paste that was not properly adjusted.
In blkreftable.c, the loop incorrectly doubled chunkno instead of
max_chunks. Fix that. Also remove a nearby assertion per repeated
off-list complaints from Tom Lane.
Per Coverity and subsequent code inspection by me and by Tom Lane.
Discussion: http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzJnXSE-kRGw@mail.gmail.com
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Reported-by: Michael Paquier
Discussion: https://postgr.es/m/ZZKTDPxBBMt3C0J9@paquier.xyz
Backpatch-through: 12
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add_file_to_manifest declared its mtime argument as pg_time_t,
apparently on the principle that copy-and-paste from the backend
is fine. However, the callers are passing struct stat's st_mtime
field which is plain time_t, and add_file_to_manifest itself is
passing the value to gmtime(3) which expects plain time_t,
so the whole thing would not work at all on any platform where
those types are different. Fortunately we can just switch this
variable to time_t.
Per warnings from assorted buildfarm members.
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Apparently, spell check would have been a really good idea.
Alexander Lakhin, with a few additions as per an off-list report
from Andres Freund.
Discussion: http://postgr.es/m/f08f7c60-1ad3-0b57-d580-54b11f07cddf@gmail.com
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To take an incremental backup, you use the new replication command
UPLOAD_MANIFEST to upload the manifest for the prior backup. This
prior backup could either be a full backup or another incremental
backup. You then use BASE_BACKUP with the INCREMENTAL option to take
the backup. pg_basebackup now has an --incremental=PATH_TO_MANIFEST
option to trigger this behavior.
An incremental backup is like a regular full backup except that
some relation files are replaced with files with names like
INCREMENTAL.${ORIGINAL_NAME}, and the backup_label file contains
additional lines identifying it as an incremental backup. The new
pg_combinebackup tool can be used to reconstruct a data directory
from a full backup and a series of incremental backups.
Patch by me. Reviewed by Matthias van de Meent, Dilip Kumar, Jakub
Wartak, Peter Eisentraut, and Álvaro Herrera. Thanks especially to
Jakub for incredibly helpful and extensive testing.
Discussion: http://postgr.es/m/CA+TgmoYOYZfMCyOXFyC-P+-mdrZqm5pP2N7S-r0z3_402h9rsA@mail.gmail.com
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