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d6fa44fce7
The regression tests for contrib/test_decoding regularly failed on postgres instances that were very slow. Either because the hardware itself was slow or because very expensive debugging options like CLOBBER_CACHE_ALWAYS were used. The reason they failed was just that some additional transactions were decoded. Analyze and vacuum, triggered by autovac. To fix just add a option to test_decoding to only display transactions in which a change was actually displayed. That's not pretty because it removes information from the tests; but better than constantly failing tests in very likely harmless ways. Backpatch to 9.4 where logical decoding was introduced. Discussion: 20140629142511.GA26930@awork2.anarazel.de
88 lines
2.3 KiB
Plaintext
88 lines
2.3 KiB
Plaintext
-- predictability
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SET synchronous_commit = on;
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-- fail because we're creating a slot while in an xact with xid
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BEGIN;
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SELECT txid_current() = 0;
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?column?
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----------
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f
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(1 row)
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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ERROR: cannot create logical replication slot in transaction that has performed writes
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ROLLBACK;
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-- fail because we're creating a slot while in an subxact whose topxact has a xid
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BEGIN;
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SELECT txid_current() = 0;
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?column?
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----------
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f
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(1 row)
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SAVEPOINT barf;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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ERROR: cannot create logical replication slot in transaction that has performed writes
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ROLLBACK TO SAVEPOINT barf;
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ROLLBACK;
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-- succeed, outside tx.
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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?column?
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----------
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init
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(1 row)
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SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
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?column?
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----------
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stop
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(1 row)
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-- succeed, in tx without xid.
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BEGIN;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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?column?
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----------
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init
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(1 row)
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COMMIT;
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CREATE TABLE nobarf(id serial primary key, data text);
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INSERT INTO nobarf(data) VALUES('1');
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-- decoding works in transaction with xid
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BEGIN;
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SELECT txid_current() = 0;
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?column?
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----------
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f
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(1 row)
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-- don't show yet, haven't committed
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INSERT INTO nobarf(data) VALUES('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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data
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-----------------------------------------------------------
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BEGIN
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table public.nobarf: INSERT: id[integer]:1 data[text]:'1'
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COMMIT
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(3 rows)
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COMMIT;
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INSERT INTO nobarf(data) VALUES('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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data
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-----------------------------------------------------------
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BEGIN
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table public.nobarf: INSERT: id[integer]:2 data[text]:'2'
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COMMIT
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BEGIN
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table public.nobarf: INSERT: id[integer]:3 data[text]:'3'
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COMMIT
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(6 rows)
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SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
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?column?
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----------
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stop
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(1 row)
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