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Such replication slots are physical slots freshly created without WAL being reserved, which is the default behavior, which have not been used yet as WAL consumption resources to retain WAL. This prevents advancing a slot to a position older than any WAL available, which could falsify calculations for WAL segment recycling. This also cleans up a bit the code, as ReplicationSlotRelease() would be called on ERROR, and improves error messages. Reported-by: Kyotaro Horiguchi Author: Michael Paquier Reviewed-by: Andres Freund, Álvaro Herrera, Kyotaro Horiguchi Discussion: https://postgr.es/m/20180626071305.GH31353@paquier.xyz
77 lines
3.2 KiB
PL/PgSQL
77 lines
3.2 KiB
PL/PgSQL
-- predictability
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding');
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_t', 'test_decoding', true);
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SELECT pg_drop_replication_slot('regression_slot_p');
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_p', 'test_decoding', false);
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot_t2', 'test_decoding', true);
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-- here we want to start a new session and wait till old one is gone
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select pg_backend_pid() as oldpid \gset
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\c -
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SET synchronous_commit = on;
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do 'declare c int = 0;
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begin
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while (select count(*) from pg_replication_slots where active_pid = '
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:'oldpid'
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') > 0 loop c := c + 1; perform pg_sleep(0.01); end loop;
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raise log ''slot test looped % times'', c;
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end';
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-- should fail because the temporary slots were dropped automatically
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SELECT pg_drop_replication_slot('regression_slot_t');
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SELECT pg_drop_replication_slot('regression_slot_t2');
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-- permanent slot has survived
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SELECT pg_drop_replication_slot('regression_slot_p');
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-- test switching between slots in a session
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot1', 'test_decoding', true);
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CREATE TABLE replication_example(id SERIAL PRIMARY KEY, somedata int, text varchar(120));
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BEGIN;
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INSERT INTO replication_example(somedata, text) VALUES (1, 1);
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INSERT INTO replication_example(somedata, text) VALUES (1, 2);
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COMMIT;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot2', 'test_decoding', true);
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INSERT INTO replication_example(somedata, text) VALUES (1, 3);
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SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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INSERT INTO replication_example(somedata, text) VALUES (1, 4);
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INSERT INTO replication_example(somedata, text) VALUES (1, 5);
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SELECT pg_current_wal_lsn() AS wal_lsn \gset
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INSERT INTO replication_example(somedata, text) VALUES (1, 6);
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SELECT end_lsn FROM pg_replication_slot_advance('regression_slot1', :'wal_lsn') \gset
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SELECT slot_name FROM pg_replication_slot_advance('regression_slot2', pg_current_wal_lsn());
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SELECT :'wal_lsn' = :'end_lsn';
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SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
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DROP TABLE replication_example;
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-- error
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot1', 'test_decoding', true);
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-- both should error as they should be dropped on error
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SELECT pg_drop_replication_slot('regression_slot1');
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SELECT pg_drop_replication_slot('regression_slot2');
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-- slot advance with physical slot, error with non-reserved slot
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SELECT slot_name FROM pg_create_physical_replication_slot('regression_slot3');
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SELECT pg_replication_slot_advance('regression_slot3', '0/0'); -- invalid LSN
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SELECT pg_replication_slot_advance('regression_slot3', '0/1'); -- error
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SELECT pg_drop_replication_slot('regression_slot3');
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