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19890a064e
Commit 0aa8a01d04 extends the output plugin API to allow decoding of
prepared xacts and allowed the user to enable/disable the two-phase option
via pg_logical_slot_get_changes(). This can lead to a problem such that
the first time when it gets changes via pg_logical_slot_get_changes()
without two_phase option enabled it will not get the prepared even though
prepare is after consistent snapshot. Now next time during getting changes,
if the two_phase option is enabled it can skip prepare because by that
time start decoding point has been moved. So the user will only get commit
prepared.
Allow to enable/disable this option at the create slot time and default
will be false. It will break the existing slots which is fine in a major
release.
Author: Ajin Cherian
Reviewed-by: Amit Kapila and Vignesh C
Discussion: https://postgr.es/m/d0f60d60-133d-bf8d-bd70-47784d8fabf3@enterprisedb.com
46 lines
2.2 KiB
PL/PgSQL
46 lines
2.2 KiB
PL/PgSQL
-- Test streaming of two-phase commits
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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 stream_test(data text);
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-- consume 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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-- streaming test with sub-transaction and PREPARE/COMMIT PREPARED
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BEGIN;
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SAVEPOINT s1;
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SELECT 'msg5' FROM pg_logical_emit_message(true, 'test', repeat('a', 50));
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INSERT INTO stream_test SELECT repeat('a', 2000) || g.i FROM generate_series(1, 35) g(i);
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TRUNCATE table stream_test;
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ROLLBACK TO s1;
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INSERT INTO stream_test SELECT repeat('a', 10) || g.i FROM generate_series(1, 20) g(i);
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PREPARE TRANSACTION 'test1';
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-- should show the inserts after a ROLLBACK
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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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COMMIT PREPARED 'test1';
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--should show the COMMIT PREPARED and the other changes in the transaction
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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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-- streaming test with sub-transaction and PREPARE/COMMIT PREPARED but with
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-- filtered gid. gids with '_nodecode' will not be decoded at prepare time.
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BEGIN;
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SAVEPOINT s1;
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SELECT 'msg5' FROM pg_logical_emit_message(true, 'test', repeat('a', 50));
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INSERT INTO stream_test SELECT repeat('a', 2000) || g.i FROM generate_series(1, 35) g(i);
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TRUNCATE table stream_test;
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ROLLBACK to s1;
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INSERT INTO stream_test SELECT repeat('a', 10) || g.i FROM generate_series(1, 20) g(i);
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PREPARE TRANSACTION 'test1_nodecode';
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-- should NOT show inserts after a ROLLBACK
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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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COMMIT PREPARED 'test1_nodecode';
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-- should show the inserts but not show a COMMIT PREPARED but a COMMIT
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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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DROP TABLE stream_test;
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SELECT pg_drop_replication_slot('regression_slot');
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