Re: backup manifests

David Steele <david@pgmasters.net>

From: David Steele <david@pgmasters.net>

To: Andres Freund <andres@anarazel.de>, Robert Haas <robertmhaas@gmail.com>

Cc: Noah Misch <noah@leadboat.com>, Stephen Frost <sfrost@snowman.net>, Amit Kapila <amit.kapila16@gmail.com>, Suraj Kharage <suraj.kharage@enterprisedb.com>, tushar <tushar.ahuja@enterprisedb.com>, Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, Rushabh Lathia <rushabh.lathia@gmail.com>, Tels <nospam-pg-abuse@bloodgate.com>, Andrew Dunstan <andrew.dunstan@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Jeevan Chalke <jeevan.chalke@enterprisedb.com>, vignesh C <vignesh21@gmail.com>

Date: 2020-03-30T22:56:58Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Try to avoid compiler warnings in optimized builds.
- 05021a2c0cd2 13.0 landed
Fix option related issues in pg_verifybackup.
- 0a89e93bfaa6 13.0 landed
Add index term for backup manifest in documentation.
- 4db819ba4039 13.0 landed
Code review for backup manifest.
- a2ac73e7be7a 13.0 landed
Document the backup manifest file format.
- 149f2ae88ab0 13.0 landed
Fix typo in pg_validatebackup documentation.
- c4f82a779d26 13.0 landed
Exclude backup_manifest file that existed in database, from BASE_BACKUP.
- 1ec50a81ec0a 13.0 landed
Msys2 tweaks for pg_validatebackup corruption test
- c3e4cbaab936 13.0 landed
Fix resource management bug with replication=database.
- 3e0d80fd8d3d 13.0 cited
Be more careful about time_t vs. pg_time_t in basebackup.c.
- db1531cae009 13.0 cited
pg_validatebackup: Fix 'make clean' to remove tmp_check.
- 9f8f881caa0f 13.0 landed
pg_validatebackup: Also use perl2host in TAP tests.
- 460314db08e8 13.0 landed
Generate backup manifests for base backups, and validate them.
- 0d8c9c1210c4 13.0 landed
Add checksum helper functions.
- c12e43a2e0d4 13.0 landed
pg_waldump: Add a --quiet option.
- ac44367efbef 13.0 landed
Catversion bump for b9b408c48724
- afb5465e0cfc 13.0 cited
pg_basebackup: Refactor code for reading COPY and tar data.
- 431ba7bebf13 13.0 landed
Use a ResourceOwner to track buffer pins in all cases.
- 3cb646264e8c 12.0 cited
Use ARMv8 CRC instructions where available.
- f044d71e331d 11.0 cited
Logical replication support for initial data copy
- 7c4f52409a8c 10.0 cited
Use Intel SSE 4.2 CRC instructions where available.
- 3dc2d62d0486 9.5.0 cited
Switch to CRC-32C in WAL and other places.
- 5028f22f6eb0 9.5.0 cited
Remove support for 64-bit CRC.
- 404bc51cde9d 9.5.0 cited
Change CRCs in WAL records from 64bit to 32bit for performance reasons.
- 21fda22ec46d 8.1.0 cited

On 3/30/20 5:08 PM, Andres Freund wrote:
> 
> The data in the backup label isn't sufficient though. Without having
> parsed the timeline file there's no way to verify that the correct WAL
> is present. I guess we can also add client side tools to parse
> timelines, add command the fetch all of the required files, and then
> interpret that somehow.
> 
> But that seems much more complicated.
> 
> Imo it makes sense to want to be able verify that WAL looks correct even
> transporting WAL using another method (say archiving) and thus using
> pg_basebackup's -Xnone.
> 
> For the manifest to actually list what's required for the base backup
> doesn't seem redundant to me. Imo it makes the manifest file make a good
> bit more sense, since afterwards it actually describes the whole base
> backup.

FWIW, pgBackRest stores the backup WAL stop/start in the manifest. To 
get this information after the backup is complete requires parsing the 
.backup file which doesn't get stored in the backup directory by 
pg_basebackup. As far as I know, this is only accessibly to solutions 
that implement archive_command. So, pgBackRest could do that but it 
seems far more trouble than it is worth.

Regards,
-- 
-David
david@pgmasters.net