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postgres_fdw: Add option to control whether to keep connections open.

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This commit adds a new option keep_connections that controls
whether postgres_fdw keeps the connections to the foreign server open
so that the subsequent queries can re-use them. This option can only be
specified for a foreign server. The default is on. If set to off,
all connections to the foreign server will be discarded
at the end of transaction. Closed connections will be re-established
when they are necessary by future queries using a foreign table.

This option is useful, for example, when users want to prevent
the connections from eating up the foreign servers connections
capacity.

Author: Bharath Rupireddy
Reviewed-by: Alexey Kondratov, Vignesh C, Fujii Masao
Discussion: https://postgr.es/m/CALj2ACVvrp5=AVp2PupEm+nAC8S4buqR3fJMmaCoc7ftT0aD2A@mail.gmail.com
This commit is contained in:
Fujii Masao
2021-04-02 19:45:42 +09:00
parent 9c5f67fd62
commit b1be3074ac
5 changed files with 101 additions and 9 deletions
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4
contrib/postgres_fdw/option.c
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@ -108,7 +108,8 @@ postgres_fdw_validator(PG_FUNCTION_ARGS)
*/
if (strcmp(def->defname, "use_remote_estimate") == 0 ||
strcmp(def->defname, "updatable") == 0 ||
strcmp(def->defname, "async_capable") == 0)
strcmp(def->defname, "async_capable") == 0 ||
strcmp(def->defname, "keep_connections") == 0)
{
/* these accept only boolean values */
(void) defGetBoolean(def);
@ -221,6 +222,7 @@ InitPgFdwOptions(void)
/* async_capable is available on both server and table */
{"async_capable", ForeignServerRelationId, false},
{"async_capable", ForeignTableRelationId, false},
{"keep_connections", ForeignServerRelationId, false},
{"password_required", UserMappingRelationId, false},
/*