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79fb46456f
The timescale clustering code so far has been written referring to the remote databases as 'servers'. This terminology is a bit overloaded, and in particular we don't enforce any network topology limitations that the term 'server' would suggest. In light of this we've decided to change to use the term 'node' when referring to the different databases in a distributed database. Specifically we refer to the frontend as an 'access node' and to the backends as 'data nodes', though we may omit the access or data qualifier where it's unambiguous. As the vast bulk of the code so far has been written for the case where there was a single access node, almost all instances of 'server' were references to data nodes. This change has updated the code to rename those instances.
80 lines
3.6 KiB
PL/PgSQL
80 lines
3.6 KiB
PL/PgSQL
-- This file and its contents are licensed under the Timescale License.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-TIMESCALE for a copy of the license.
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\c :TEST_DBNAME :ROLE_SUPERUSER
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CREATE OR REPLACE FUNCTION create_records()
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RETURNS VOID
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AS :TSL_MODULE_PATHNAME, 'tsl_test_remote_txn_resolve_create_records'
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LANGUAGE C;
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CREATE OR REPLACE FUNCTION create_records_with_concurrent_heal()
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RETURNS VOID
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AS :TSL_MODULE_PATHNAME, 'tsl_test_remote_txn_resolve_create_records_with_concurrent_heal'
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LANGUAGE C;
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CREATE OR REPLACE FUNCTION add_loopback_server(
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server_name NAME,
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host TEXT = 'localhost',
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database NAME = current_database(),
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port INTEGER = inet_server_port(),
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local_user REGROLE = NULL,
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remote_user NAME = NULL,
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password TEXT = NULL,
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if_not_exists BOOLEAN = FALSE,
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bootstrap_database NAME = 'postgres',
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bootstrap_user NAME = NULL,
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bootstrap_password TEXT = NULL
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) RETURNS TABLE(server_name NAME, host TEXT, port INTEGER, database NAME, username NAME, server_username NAME, created BOOL)
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AS :TSL_MODULE_PATHNAME, 'tsl_unchecked_add_data_node'
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LANGUAGE C;
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SELECT true FROM add_loopback_server('loopback', database => :'TEST_DBNAME', port=>current_setting('port')::integer, if_not_exists => true);
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SELECT true FROM add_loopback_server('loopback2', database => :'TEST_DBNAME', port=>current_setting('port')::integer, if_not_exists => true);
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SELECT true FROM add_loopback_server('loopback3', database => :'TEST_DBNAME', port=>current_setting('port')::integer, if_not_exists => true);
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create table table_modified_by_txns (
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describes text
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);
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--create records will create 3 records
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--1) that is committed
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--2) that is prepared but not committed
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--3) that is prepared and rolled back
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--Thus (1) will be seen right away, (2) will be seen after the heal, (3) will never be seen
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SELECT create_records();
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SELECT * FROM table_modified_by_txns;
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SELECT count(*) FROM pg_prepared_xacts;
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SELECT count(*) FROM _timescaledb_catalog.remote_txn;
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback'));
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback2'));
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback3'));
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SELECT * FROM table_modified_by_txns;
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SELECT count(*) FROM pg_prepared_xacts;
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SELECT count(*) FROM _timescaledb_catalog.remote_txn;
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--insert one record where the heal function is run concurrently during different steps of the process
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--this tests safety when, for example, the heal function is run while the frontend txn is still ongoing.
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SELECT create_records_with_concurrent_heal();
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SELECT * FROM table_modified_by_txns;
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SELECT count(*) FROM pg_prepared_xacts;
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SELECT count(*) FROM _timescaledb_catalog.remote_txn;
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--test that it is safe to have non-ts prepared-txns with heal
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BEGIN;
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INSERT INTO public.table_modified_by_txns VALUES ('non-ts-txn');
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PREPARE TRANSACTION 'non-ts-txn';
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback'));
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback2'));
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SELECT _timescaledb_internal.remote_txn_heal_data_node((SELECT OID FROM pg_foreign_server WHERE srvname = 'loopback3'));
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COMMIT PREPARED 'non-ts-txn';
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SELECT * FROM table_modified_by_txns;
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SELECT count(*) FROM pg_prepared_xacts;
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SELECT count(*) FROM _timescaledb_catalog.remote_txn;
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