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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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23
contrib/postgres_fdw/expected/postgres_fdw.out
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@ -8913,7 +8913,7 @@ DO $d$
END;
$d$;
ERROR: invalid option "password"
HINT: Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size, async_capable
HINT: Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size, async_capable, keep_connections
CONTEXT: SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
PL/pgSQL function inline_code_block line 3 at EXECUTE
-- If we add a password for our user mapping instead, we should get a different
@ -9249,6 +9249,27 @@ 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;
?column?
----------
1
(1 row)
-- No cached connections, so no records should be output.
SELECT server_name FROM postgres_fdw_get_connections() ORDER BY 1;
server_name
-------------
(0 rows)
ALTER SERVER loopback OPTIONS (SET keep_connections 'on');
-- ===================================================================
-- batch insert
-- ===================================================================
BEGIN;