mirror of https://github.com/citusdata/citus.git
46 lines
2.0 KiB
Plaintext
46 lines
2.0 KiB
Plaintext
-- removing coordinator from pg_dist_node should update pg_dist_colocation
|
|
SELECT master_remove_node('localhost', :master_port);
|
|
master_remove_node
|
|
---------------------------------------------------------------------
|
|
|
|
(1 row)
|
|
|
|
-- to silence -potentially flaky- "could not establish connection after" warnings in below test
|
|
SET client_min_messages TO ERROR;
|
|
-- to fail fast when the hostname is not resolvable, as it will be the case below
|
|
SET citus.node_connection_timeout to '1s';
|
|
BEGIN;
|
|
SET application_name TO 'new_app_name';
|
|
-- that should fail because of bad hostname & port
|
|
SELECT citus_add_node('200.200.200.200', 1, 200);
|
|
ERROR: connection to the remote node postgres@200.200.200.200:1 failed
|
|
-- Since above command failed, now Postgres will need to revert the
|
|
-- application_name change made in this transaction and this will
|
|
-- happen within abort-transaction callback, so we won't be in a
|
|
-- transaction block while Postgres does that.
|
|
--
|
|
-- And when the application_name changes, Citus tries to re-assign
|
|
-- the global pid but it does so only for Citus internal backends,
|
|
-- and doing so for Citus internal backends doesn't require being
|
|
-- in a transaction block and is safe.
|
|
--
|
|
-- However, for the client external backends (like us here), Citus
|
|
-- doesn't re-assign the global pid because it's not needed and it's
|
|
-- not safe to do so outside of a transaction block. This is because,
|
|
-- it would require performing a catalog access to retrive the local
|
|
-- node id when the cached local node is invalidated like what just
|
|
-- happened here because of the failed citus_add_node() call made
|
|
-- above.
|
|
--
|
|
-- So by failing here (rather than crashing), we ensure this behavior.
|
|
ROLLBACK;
|
|
RESET client_min_messages;
|
|
RESET citus.node_connection_timeout;
|
|
-- restore coordinator for the rest of the tests
|
|
SELECT citus_set_coordinator_host('localhost', :master_port);
|
|
citus_set_coordinator_host
|
|
---------------------------------------------------------------------
|
|
|
|
(1 row)
|
|
|