Horton

Re: Add LZ4 compression in pg_dump

Justin Pryzby <pryzby@telsasoft.com>

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From: Justin Pryzby <pryzby@telsasoft.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: gkokolatos@pm.me, pgsql-hackers@lists.postgresql.org, Rachel Heaton <rachelmheaton@gmail.com>
Date: 2022-12-19T17:42:58Z
Lists: pgsql-hackers 
On Mon, Dec 19, 2022 at 01:06:00PM +0900, Michael Paquier wrote:
> On Sat, Dec 17, 2022 at 05:26:15PM -0600, Justin Pryzby wrote:
> > 001: still refers to "gzip", which is correct for -Fp and -Fd but not
> > for -Fc, for which it's more correct to say "zlib".
> 
> Or should we begin by changing all these existing "not built with zlib 
> support" error strings to the more generic "this build does not
> support compression with %s" to reduce the number of messages to
> translate?  That would bring consistency with the other tools dealing
> with compression.

That's fine, but it doesn't touch on the issue I'm talking about, which
is that zlib != gzip.

BTW I noticed that that also affects the pg_dump file itself; 002
changes the file format to say "gzip", but that's wrong for -Fc, which
does not use gzip headers, which could be surprising to someone who
specified "gzip".

-- 
Justin

Commits

  1. Advance input pointer when LZ4 compressing data

  2. Null-terminate the output buffer of LZ4Stream_gets

  3. Rework code defining default compression for dir/custom formats in pg_dump

  4. pg_dump: Use only LZ4 frame format for compression

  5. Minor comment improvements for compress_lz4

  6. Unify buffer sizes in pg_dump compression API

  7. Improve type handling in pg_dump's compress file API

  8. Improve wording in pg_dump compression docs

  9. Fix condition in pg_dump TAP test

  10. Add LZ4 compression to pg_dump

  11. Introduce a generic pg_dump compression API

  12. Prepare pg_dump internals for additional compression methods

  13. Fix behavior with pg_restore -l and compressed dumps

  14. Add 250c8ee07ed to git-blame-ignore-revs

  15. Provide test coverage in pg_dump for default behaviors with compression

  16. Switch pg_dump to use compression specifications

  17. Refactor code parsing compression option values (-Z/--compress)

  18. meson: Add some missing env settings for tests of pg_dump and pg_verifybackup

  19. Extend TAP tests of pg_dump to test for compression with gzip

  20. Clean up some dead code in pg_dump with tar format and gzip compression

  21. Add TAP test in pg_dump with --format=tar and --compress

  22. Replace BASE_BACKUP COMPRESSION_LEVEL option with COMPRESSION_DETAIL.

  23. Refactor the pg_dump zlib code from pg_backup_custom.c to a separate file,