Re: backup manifests

Michael Paquier <michael@paquier.xyz>

From: Michael Paquier <michael@paquier.xyz>

To: David Steele <david@pgmasters.net>

Cc: Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>

Date: 2019-09-20T07:15:28Z

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 Thu, Sep 19, 2019 at 11:10:46PM -0400, David Steele wrote:
> On 9/19/19 11:00 AM, Robert Haas wrote:
>> On Thu, Sep 19, 2019 at 9:51 AM Robert Haas <robertmhaas@gmail.com> wrote:
>> > I intend that we should be able to support incremental backups based
>> > either on a previous full backup or based on a previous incremental
>> > backup. I am not aware of a technical reason why we need to identify
>> > the specific backup that must be used. If incremental backup B is
>> > taken based on a pre-existing backup A, then I think that B can be
>> > restored using either A or *any other backup taken after A and before
>> > B*. In the normal case, there probably wouldn't be any such backup,
>> > but AFAICS the start-LSNs are a sufficient cross-check that the chosen
>> > base backup is legal.
>> 
>> Scratch that: there can be overlapping backups, so you have to
>> cross-check both start and stop LSNs.
> 
> Overall we have found it's much simpler to label each backup and cross-check
> that against the pg version and system id.  Start LSN is pretty unique, but
> backup labels work really well and are more widely understood.

Warning.  The start LSN could be the same for multiple backups when
taken from a standby.
--
Michael