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d759c1a0b8
The test was unstable in branches 14 and 15 as we were relying on the number of changes in the table having a toast column to start streaming. On branches >= 16, we have a GUC debug_logical_replication_streaming which can stream each change, so the test was stable in those branches. Change the test to use PREPARE TRANSACTION as that should make the result consistent and test the code changed in 022564f60c. Reported-by: Daniel Gustafsson as per buildfarm Author: Hou Zhijie, Amit Kapila Backpatch-through: 14 Discussion: https://postgr.es/m/8C2F86AA-981E-4803-B14D-E264C0255330@yesql.se
138 lines
6.4 KiB
PL/PgSQL
138 lines
6.4 KiB
PL/PgSQL
-- Test prepared transactions. When two-phase-commit is enabled, transactions are
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-- decoded at PREPARE time rather than at COMMIT PREPARED time.
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding', false, true);
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CREATE TABLE test_prepared1(id integer primary key);
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CREATE TABLE test_prepared2(id integer primary key);
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-- Test that decoding happens at PREPARE time when two-phase-commit is enabled.
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-- Decoding after COMMIT PREPARED must have all the commands in the transaction.
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BEGIN;
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INSERT INTO test_prepared1 VALUES (1);
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INSERT INTO test_prepared1 VALUES (2);
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-- should show nothing because the xact has not been prepared yet.
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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PREPARE TRANSACTION 'test_prepared#1';
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-- should show both the above inserts and the PREPARE TRANSACTION.
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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COMMIT PREPARED 'test_prepared#1';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test that rollback of a prepared xact is decoded.
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BEGIN;
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INSERT INTO test_prepared1 VALUES (3);
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PREPARE TRANSACTION 'test_prepared#2';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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ROLLBACK PREPARED 'test_prepared#2';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test prepare of a xact containing ddl. Leaving xact uncommitted for next test.
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BEGIN;
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ALTER TABLE test_prepared1 ADD COLUMN data text;
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INSERT INTO test_prepared1 VALUES (4, 'frakbar');
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PREPARE TRANSACTION 'test_prepared#3';
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-- confirm that exclusive lock from the ALTER command is held on test_prepared1 table
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SELECT 'test_prepared_1' AS relation, locktype, mode
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FROM pg_locks
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WHERE locktype = 'relation'
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AND relation = 'test_prepared1'::regclass;
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-- The insert should show the newly altered column but not the DDL.
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test that we decode correctly while an uncommitted prepared xact
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-- with ddl exists.
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--
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-- Use a separate table for the concurrent transaction because the lock from
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-- the ALTER will stop us inserting into the other one.
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--
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INSERT INTO test_prepared2 VALUES (5);
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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COMMIT PREPARED 'test_prepared#3';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- make sure stuff still works
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INSERT INTO test_prepared1 VALUES (6);
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INSERT INTO test_prepared2 VALUES (7);
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Check 'CLUSTER' (as operation that hold exclusive lock) doesn't block
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-- logical decoding.
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BEGIN;
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INSERT INTO test_prepared1 VALUES (8, 'othercol');
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CLUSTER test_prepared1 USING test_prepared1_pkey;
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INSERT INTO test_prepared1 VALUES (9, 'othercol2');
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PREPARE TRANSACTION 'test_prepared_lock';
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SELECT 'test_prepared1' AS relation, locktype, mode
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FROM pg_locks
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WHERE locktype = 'relation'
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AND relation = 'test_prepared1'::regclass;
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-- The above CLUSTER command shouldn't cause a timeout on 2pc decoding.
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\set env_timeout ''
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\getenv env_timeout PG_TEST_TIMEOUT_DEFAULT
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SELECT COALESCE(NULLIF(:'env_timeout', ''), '180') || 's' AS timeout \gset
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SET statement_timeout = :'timeout';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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RESET statement_timeout;
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COMMIT PREPARED 'test_prepared_lock';
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-- consume the commit
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test savepoints and sub-xacts. Creating savepoints will create
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-- sub-xacts implicitly.
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BEGIN;
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CREATE TABLE test_prepared_savepoint (a int);
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INSERT INTO test_prepared_savepoint VALUES (1);
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SAVEPOINT test_savepoint;
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INSERT INTO test_prepared_savepoint VALUES (2);
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ROLLBACK TO SAVEPOINT test_savepoint;
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PREPARE TRANSACTION 'test_prepared_savepoint';
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-- should show only 1, not 2
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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COMMIT PREPARED 'test_prepared_savepoint';
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-- consume the commit
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test that a GID containing "_nodecode" gets decoded at commit prepared time.
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BEGIN;
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INSERT INTO test_prepared1 VALUES (20);
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PREPARE TRANSACTION 'test_prepared_nodecode';
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-- should show nothing
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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COMMIT PREPARED 'test_prepared_nodecode';
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-- should be decoded now
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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-- Test that accessing a TOAST table is permitted during the decoding of a
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-- prepared transaction.
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-- Create a table with a column that uses a TOASTed default value.
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-- (temporarily hide query, to avoid the long CREATE TABLE stmt)
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\set ECHO none
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SELECT 'CREATE TABLE test_tab (a text DEFAULT ''' || string_agg('toast value', '') || ''');' FROM generate_series(1, 4000)
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\gexec
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\set ECHO all
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BEGIN;
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INSERT INTO test_tab VALUES('test');
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PREPARE TRANSACTION 'test_toast_table_access';
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SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
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COMMIT PREPARED 'test_toast_table_access';
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-- consume commit prepared
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1', 'stream-changes', '1');
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-- Test 8:
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-- cleanup and make sure results are also empty
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DROP TABLE test_prepared1;
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DROP TABLE test_prepared2;
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DROP TABLE test_prepared_savepoint;
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DROP TABLE test_tab;
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-- show results. There should be nothing to show
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT pg_drop_replication_slot('regression_slot');
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