Horton

Re: backup manifests

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: David Steele <david@pgmasters.net>, Stephen Frost <sfrost@snowman.net>, David Fetter <david@fetter.org>, Tels <nospam-pg-abuse@bloodgate.com>, Suraj Kharage <suraj.kharage@enterprisedb.com>, Rushabh Lathia <rushabh.lathia@gmail.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: 2020-01-14T17:53:04Z
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 →

  1. Try to avoid compiler warnings in optimized builds.

  2. Fix option related issues in pg_verifybackup.

  3. Add index term for backup manifest in documentation.

  4. Code review for backup manifest.

  5. Document the backup manifest file format.

  6. Fix typo in pg_validatebackup documentation.

  7. Exclude backup_manifest file that existed in database, from BASE_BACKUP.

  8. Msys2 tweaks for pg_validatebackup corruption test

  9. Fix resource management bug with replication=database.

  10. Be more careful about time_t vs. pg_time_t in basebackup.c.

  11. pg_validatebackup: Fix 'make clean' to remove tmp_check.

  12. pg_validatebackup: Also use perl2host in TAP tests.

  13. Generate backup manifests for base backups, and validate them.

  14. Add checksum helper functions.

  15. pg_waldump: Add a --quiet option.

  16. Catversion bump for b9b408c48724

  17. pg_basebackup: Refactor code for reading COPY and tar data.

  18. Use a ResourceOwner to track buffer pins in all cases.

  19. Use ARMv8 CRC instructions where available.

  20. Logical replication support for initial data copy

  21. Use Intel SSE 4.2 CRC instructions where available.

  22. Switch to CRC-32C in WAL and other places.

  23. Remove support for 64-bit CRC.

  24. Change CRCs in WAL records from 64bit to 32bit for performance reasons.

Robert Haas <robertmhaas@gmail.com> writes:
> ... I would also expect that depending on an external package
> would provoke significant opposition. If we suck the code into core,
> then we have to keep it up to date with the upstream, which is a
> significant maintenance burden - look at all the time Tom has spent on
> snowball, regex, and time zone code over the years.

Also worth noting is that we have a seriously bad track record about
choosing external packages to depend on.  The regex code has no upstream
maintainer anymore (well, the Tcl guys seem to think that *we* are
upstream for that now), and snowball is next door to moribund.
With C not being a particularly hip language to develop in anymore,
it wouldn't surprise me in the least for any C-code JSON parser
we might pick to go dead pretty soon.

Between that problem and the likelihood that we'd need to make
significant code changes anyway to meet our own coding style etc
expectations, I think really we'd have to assume that we're going
to fork and maintain our own copy of any code we pick.

Now, if it's a small enough chunk of code (and really, how complex
is JSON parsing anyway) maybe that doesn't matter.  But I tend to
agree with Robert's position that it's a big ask for this patch
to introduce a frontend JSON parser.

			regards, tom lane