Horton

Re: refactoring basebackup.c

Sergei Kornilov <sk@zsrv.org>

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From: Sergei Kornilov <sk@zsrv.org>
To: Robert Haas <robertmhaas@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>
Cc: Jeevan Ladhe <jeevan.ladhe@enterprisedb.com>, Mark Dilger <mark.dilger@enterprisedb.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, tushar <tushar.ahuja@enterprisedb.com>
Date: 2021-09-14T15:30:22Z
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. Document BaseBackupSync and BaseBackupWrite wait events.

  2. Support long distance matching for zstd compression

  3. Fix possible NULL-pointer-deference in backup_compression.c.

  4. Allow parallel zstd compression when taking a base backup.

  5. Make PostgreSQL::Test::Cluster::run_log() return a useful value.

  6. Fix a few goofs in new backup compression code.

  7. Replace BASE_BACKUP COMPRESSION_LEVEL option with COMPRESSION_DETAIL.

  8. Add 'basebackup_to_shell' contrib module.

  9. Allow extensions to add new backup targets.

  10. Change HAVE_LIBLZ4 and HAVE_LIBZSTD tests to USE_LZ4 and USE_ZSTD.

  11. pg_basebackup: Clean up some bogus file extension tests.

  12. pg_basebackup: Avoid unclean failure with server-compression and -D -.

  13. Fix LZ4 tests for remaining buffer space.

  14. Add support for zstd base backup compression.

  15. pg_basebackup: Allow client-side LZ4 (de)compression.

  16. Add suport for server-side LZ4 base backup compression.

  17. Add min() and max() aggregates for xid8.

  18. Remove superfluous variable.

  19. pg_basebackup: Cleaner handling when compression is multiply specified.

  20. Allow server-side compression to be used with -Fp.

  21. pg_basebackup: Fix a couple of recently-introduced bugs.

  22. Tidy up a few cosmetic issues related to pg_basebackup.

  23. Server-side gzip compression.

  24. Unbreak pg_basebackup/t/010_pg_basebackup.pl on msys

  25. Suppress variable-set-but-not-used warning from clang 13.

  26. Extend the options of pg_basebackup to control compression

  27. Support base backup targets.

  28. Modify pg_basebackup to use a new COPY subprotocol for base backups.

  29. Document that tar archives are now properly terminated.

  30. Fix thinko in bbsink_throttle_manifest_contents.

  31. Have the server properly terminate tar archives.

  32. Minimal fix for unterminated tar archive problem.

  33. Introduce 'bbstreamer' abstraction to modularize pg_basebackup.

  34. Introduce 'bbsink' abstraction to modularize base backup code.

  35. Refactor basebackup.c's _tarWriteDir() function.

  36. Flexible options for CREATE_REPLICATION_SLOT.

  37. Flexible options for BASE_BACKUP.

Hello

I found that in 0001 you propose to rename few options. Probably we could rename another option for clarify? I think FAST (it's about some bw limits?) and WAIT (wait for what? checkpoint?) option names are confusing.
Could we replace FAST with "CHECKPOINT [fast|spread]" and WAIT to WAIT_WAL_ARCHIVED? I think such names would be more descriptive.

-		if (PQserverVersion(conn) >= 100000)
-			/* pg_recvlogical doesn't use an exported snapshot, so suppress */
-			appendPQExpBufferStr(query, " NOEXPORT_SNAPSHOT");
+		/* pg_recvlogical doesn't use an exported snapshot, so suppress */
+		if (use_new_option_syntax)
+			AppendStringCommandOption(query, use_new_option_syntax,
+									   "SNAPSHOT", "nothing");
+		else
+			AppendPlainCommandOption(query, use_new_option_syntax,
+									 "NOEXPORT_SNAPSHOT");

In 0002, it looks like condition for 9.x releases was lost?

Also my gcc version 8.3.0 is not happy with v5-0007-Support-base-backup-targets.patch and produces:

basebackup.c: In function ‘parse_basebackup_options’:
basebackup.c:970:7: error: ‘target_str’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
       errmsg("target '%s' does not accept a target detail",
       ^~~~~~

regards, Sergei