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Allow parallel zstd compression when taking a base backup.

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libzstd allows transparent parallel compression just by setting
an option when creating the compression context, so permit that
for both client and server-side backup compression. To use this,
use something like pg_basebackup --compress WHERE-zstd:workers=N
where WHERE is "client" or "server" and N is an integer.

When compression is performed on the server side, this will spawn
threads inside the PostgreSQL backend. While there is almost no
PostgreSQL server code which is thread-safe, the threads here are used
internally by libzstd and touch only data structures controlled by
libzstd.

Patch by me, based in part on earlier work by Dipesh Pandit
and Jeevan Ladhe. Reviewed by Justin Pryzby.

Discussion: http://postgr.es/m/CA+Tgmobj6u-nWF-j=FemygUhobhryLxf9h-wJN7W-2rSsseHNA@mail.gmail.com
This commit is contained in:
Robert Haas
2022-03-30 09:35:14 -04:00
parent c6863b8582
commit 51c0d186d9
9 changed files with 147 additions and 39 deletions
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16
src/common/backup_compression.c
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@ -177,6 +177,11 @@ parse_bc_specification(bc_algorithm algorithm, char *specification,
result->level = expect_integer_value(keyword, value, result);
result->options |= BACKUP_COMPRESSION_OPTION_LEVEL;
}
else if (strcmp(keyword, "workers") == 0)
{
result->workers = expect_integer_value(keyword, value, result);
result->options |= BACKUP_COMPRESSION_OPTION_WORKERS;
}
else
result->parse_error =
psprintf(_("unknown compression option \"%s\""), keyword);
@ -266,5 +271,16 @@ validate_bc_specification(bc_specification *spec)
min_level, max_level);
}
/*
* Of the compression algorithms that we currently support, only zstd
* allows parallel workers.
*/
if ((spec->options & BACKUP_COMPRESSION_OPTION_WORKERS) != 0 &&
(spec->algorithm != BACKUP_COMPRESSION_ZSTD))
{
return psprintf(_("compression algorithm \"%s\" does not accept a worker count"),
get_bc_algorithm_name(spec->algorithm));
}
return NULL;
}