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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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13
contrib/postgres_fdw/sql/postgres_fdw.sql
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@ -2821,6 +2821,19 @@ DROP USER MAPPING FOR regress_multi_conn_user2 SERVER loopback;
DROP ROLE regress_multi_conn_user1;
DROP ROLE regress_multi_conn_user2;
-- ===================================================================
-- Test foreign server level option keep_connections
-- ===================================================================
-- By default, the connections associated with foreign server are cached i.e.
-- keep_connections option is on. Set it to off.
ALTER SERVER loopback OPTIONS (keep_connections 'off');
-- connection to loopback server is closed at the end of xact
-- as keep_connections was set to off.
SELECT 1 FROM ft1 LIMIT 1;
-- No cached connections, so no records should be output.
SELECT server_name FROM postgres_fdw_get_connections() ORDER BY 1;
ALTER SERVER loopback OPTIONS (SET keep_connections 'on');
-- ===================================================================
-- batch insert
-- ===================================================================