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Add new GUC reserved_connections.

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This provides a way to reserve connection slots for non-superusers.
The slots reserved via the new GUC are available only to users who
have the new predefined role pg_use_reserved_connections.
superuser_reserved_connections remains as a final reserve in case
reserved_connections has been exhausted.

Patch by Nathan Bossart. Reviewed by Tushar Ahuja and by me.

Discussion: http://postgr.es/m/20230119194601.GA4105788@nathanxps13
This commit is contained in:
Robert Haas
2023-01-20 15:36:36 -05:00
parent fe00fec1f5
commit 6e2775e4d4
10 changed files with 115 additions and 25 deletions
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11
src/backend/utils/misc/guc_tables.c
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@ -2168,6 +2168,17 @@ struct config_int ConfigureNamesInt[] =
NULL, NULL, NULL
},
{
{"reserved_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the number of connection slots reserved for roles "
"with privileges of pg_use_reserved_connections."),
NULL
},
&ReservedConnections,
0, 0, MAX_BACKENDS,
NULL, NULL, NULL
},
{
{"min_dynamic_shared_memory", PGC_POSTMASTER, RESOURCES_MEM,
gettext_noop("Amount of dynamic shared memory reserved at startup."),