Horton

Re: trying again to get incremental backup

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Jakub Wartak <jakub.wartak@enterprisedb.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Andres Freund <andres@anarazel.de>, Peter Eisentraut <peter@eisentraut.org>, Dilip Kumar <dilipbalaut@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2023-12-07T15:14:45Z
Lists: pgsql-hackers 
On Thu, Dec 7, 2023 at 9:42 AM Jakub Wartak
<jakub.wartak@enterprisedb.com> wrote:
>     Comment: I was wondering if it wouldn't make some sense to teach
> pg_resetwal to actually delete all WAL summaries after any any
> WAL/controlfile alteration?

I thought that this was a good idea so I decided to go implement it,
only to discover that it was already part of the patch set ... did you
find some case where it doesn't work as expected? The code looks like
this:

    RewriteControlFile();
    KillExistingXLOG();
    KillExistingArchiveStatus();
    KillExistingWALSummaries();
    WriteEmptyXLOG();

> test_pending_2pc.sh - getting GOOD on most recent runs, but several
> times during early testing (probably due to my own mishaps), I've been
> hit by Abort/TRAP. I'm still investigating and trying to reproduce
> those ones. TRAP: failed Assert("summary_end_lsn >=
> WalSummarizerCtl->pending_lsn"), File: "walsummarizer.c", Line: 940

I have a fix for this locally, but I'm going to hold off on publishing
a new version until either there's a few more things I can address all
at once, or until Thomas commits the ubsan fix.

-- 
Robert Haas
EDB: http://www.enterprisedb.com

Commits

  1. Minor fixes to pg_combinebackup and its documentation.

  2. Fix defects in PrepareForIncrementalBackup.

  3. Add WALSummarizerLock to wait_event_names.txt

  4. Initialize variable to placate compiler.

  5. Replace nonsense comment with a relevant one.

  6. Fix numerous typos in incremental backup commits.

  7. Add support for incremental backup.

  8. Add a new WAL summarizer process.

  9. Move src/bin/pg_verifybackup/parse_manifest.c into src/common.

  10. Fix brown paper bag bug in 5c47c6546c413d5eb51c1626070a807026e6139d.

  11. Rename pg_verifybackup's JsonManifestParseContext callback functions.

  12. Rename JsonManifestParseContext callbacks.

  13. Change how a base backup decides which files have checksums.

  14. Change struct tablespaceinfo's oid member from 'char *' to 'Oid'

  15. Refactor parse_filename_for_nontemp_relation to parse more.

  16. During online checkpoints, insert XLOG_CHECKPOINT_REDO at redo point.

  17. In basebackup.c, refactor to create read_file_data_into_buffer.

  18. In basebackup.c, refactor to create verify_page_checksum.

  19. Report syncscan position at end of scan.

  20. Exclude additional directories in pg_basebackup

  21. Add new JSON processing functions and parser API.