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
step s2_alter_tbl2_float: ALTER TABLE tbl2 ALTER COLUMN val2 TYPE float;
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
@ -34,7 +32,7 @@ step s2_alter_tbl1_float: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE float; <waitin
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_alter_tbl1_float: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_char: ALTER TABLE tbl2 ALTER COLUMN val2 TYPE character varying;
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
@ -82,7 +78,7 @@ step s2_alter_tbl1_char: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE character varyi
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_alter_tbl1_char: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl1_float: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE float; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl1_float: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl1_char: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE character varying; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl1_char: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl1_float: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE float; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl1_float: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl1_char: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE character varying; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl1_char: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_text: ALTER TABLE tbl2 ALTER COLUMN val2 TYPE text;
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl1_char: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE character varying; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl1_char: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
@ -270,7 +254,7 @@ step s2_alter_tbl2_boolean: ALTER TABLE tbl2 ALTER COLUMN val2 TYPE boolean;
ERROR: column "val2" cannot be cast automatically to type boolean
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
data
BEGIN
@ -295,7 +279,7 @@ step s2_alter_tbl1_boolean: ALTER TABLE tbl1 ALTER COLUMN val2 TYPE boolean; <wa
step s1_commit: COMMIT;
step s2_alter_tbl1_boolean: <... completed>
error in steps s1_commit s2_alter_tbl1_boolean: ERROR: column "val2" cannot be cast automatically to type boolean
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_drop_3rd_col: ALTER TABLE tbl2 DROP COLUMN val3; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl2_drop_3rd_col: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_drop_3rd_col: ALTER TABLE tbl2 DROP COLUMN val3; <waiting ...>
step s1_commit: COMMIT;
step s2_alter_tbl2_drop_3rd_col: <... completed>
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_drop_3rd_col: ALTER TABLE tbl2 DROP COLUMN val3;
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_drop_3rd_col: ALTER TABLE tbl2 DROP COLUMN val3;
step s1_insert_tbl2: INSERT INTO tbl2 (val1, val2) VALUES (1, 1);
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
step s2_alter_tbl2_drop_3rd_col: ALTER TABLE tbl2 DROP COLUMN val3;
step s1_insert_tbl1: INSERT INTO tbl1 (val1, val2) VALUES (1, 1);
step s1_commit: COMMIT;
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0');
step s2_get_changes: SELECT regexp_replace(data, 'temp_\d+', 'temp') AS data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');