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23f722ba8e
This test, just added in commit a924c327e, sometimes fails because
the old backend hasn't finished dropping the temporary replication slot
when the new backend looks. Borrow the previously-invented methodology
for waiting for the old process to disappear from pg_stat_activity.
Petr Jelinek
Discussion: https://postgr.es/m/62935e6f-4f1b-c433-e0fa-7f936a38b3e5@2ndquadrant.com
29 lines
1.3 KiB
SQL
29 lines
1.3 KiB
SQL
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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-- 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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do 'declare c int = 0;
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begin
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while (select count(*) from pg_stat_activity where pid = '
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:'oldpid'
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') > 0 loop c := c + 1; perform pg_stat_clear_snapshot(); 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 slot was dropped automatically
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SELECT pg_drop_replication_slot('regression_slot_t');
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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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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot2', 'test_decoding', true);
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SELECT * FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL);
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SELECT * FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL);
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