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Add skip-empty-xacts option to test_decoding for use in the regression tests.

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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
This commit is contained in:
Andres Freund
2014-09-01 13:42:43 +02:00
parent 92b2c13658
commit cb3d2df90e
15 changed files with 130 additions and 243 deletions
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12
contrib/test_decoding/expected/prepared.out
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@@ -39,13 +39,9 @@ INSERT INTO test_prepared2 VALUES (9);
DROP TABLE test_prepared1;
DROP TABLE test_prepared2;
-- show results
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data
-------------------------------------------------------------------------
BEGIN
COMMIT
BEGIN
COMMIT
BEGIN
table public.test_prepared1: INSERT: id[integer]:1
COMMIT
@@ -68,11 +64,7 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'inc
BEGIN
table public.test_prepared2: INSERT: id[integer]:9
COMMIT
BEGIN
COMMIT
BEGIN
COMMIT
(30 rows)
(22 rows)
SELECT pg_drop_replication_slot('regression_slot');
pg_drop_replication_slot