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In the stats collector days it was hard to write tests for the stats system, because fundamentally delivery of stats messages over UDP was not synchronous (nor guaranteed). Now we easily can force pending stats updates to be flushed synchronously. This moves stats.sql into a parallel group, there isn't a reason for it to run in isolation anymore. And it may shake out some bugs. Bumps catversion. Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/20220303021600.hs34ghqcw6zcokdh@alap3.anarazel.de
41 lines
1.7 KiB
PL/PgSQL
41 lines
1.7 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_stats', 'test_decoding');
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CREATE TABLE stats_test(data text);
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-- non-spilled xact
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SET logical_decoding_work_mem to '64MB';
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INSERT INTO stats_test values(1);
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SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
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SELECT pg_stat_force_next_flush();
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SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
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RESET logical_decoding_work_mem;
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-- reset the slot stats
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SELECT pg_stat_reset_replication_slot('regression_slot_stats');
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SELECT slot_name, spill_txns, spill_count, total_txns, total_bytes FROM pg_stat_replication_slots;
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-- spilling the xact
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BEGIN;
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INSERT INTO stats_test SELECT 'serialize-topbig--1:'||g.i FROM generate_series(1, 5000) g(i);
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COMMIT;
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SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot_stats', NULL, NULL, 'skip-empty-xacts', '1');
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-- Check stats. We can't test the exact stats count as that can vary if any
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-- background transaction (say by autovacuum) happens in parallel to the main
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-- transaction.
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SELECT pg_stat_force_next_flush();
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SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
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-- Ensure stats can be repeatedly accessed using the same stats snapshot. See
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-- https://postgr.es/m/20210317230447.c7uc4g3vbs4wi32i%40alap3.anarazel.de
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BEGIN;
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SELECT slot_name FROM pg_stat_replication_slots;
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SELECT slot_name FROM pg_stat_replication_slots;
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COMMIT;
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DROP TABLE stats_test;
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SELECT pg_drop_replication_slot('regression_slot_stats');
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