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Allow archiving via loadable modules.

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Running a shell command for each file to be archived has a lot of
overhead and may not offer as much error checking as you want, or the
exact semantics that you want. So, offer the option to call a loadable
module for each file to be archived, rather than running a shell command.

Also, add a 'basic_archive' contrib module as an example implementation
that archives to a local directory.

Nathan Bossart, with a little bit of kibitzing by me.

Discussion: http://postgr.es/m/20220202224433.GA1036711@nathanxps13
This commit is contained in:
Robert Haas
2022-02-03 13:57:27 -05:00
parent 7c1aead6cb
commit 5ef1eefd76
26 changed files with 941 additions and 67 deletions
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12
src/backend/utils/misc/guc.c
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@@ -3881,13 +3881,23 @@ static struct config_string ConfigureNamesString[] =
{
{"archive_command", PGC_SIGHUP, WAL_ARCHIVING,
gettext_noop("Sets the shell command that will be called to archive a WAL file."),
NULL
gettext_noop("This is used only if \"archive_library\" is not set.")
},
&XLogArchiveCommand,
"",
NULL, NULL, show_archive_command
},
{
{"archive_library", PGC_SIGHUP, WAL_ARCHIVING,
gettext_noop("Sets the library that will be called to archive a WAL file."),
gettext_noop("An empty string indicates that \"archive_command\" should be used.")
},
&XLogArchiveLibrary,
"",
NULL, NULL, NULL
},
{
{"restore_command", PGC_SIGHUP, WAL_ARCHIVE_RECOVERY,
gettext_noop("Sets the shell command that will be called to retrieve an archived WAL file."),