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2050832d0d
The test cases added by that commit were trying to test the exact number of times a particular transaction has spilled. However, that number can vary if any background transaction (say by autovacuum) happens in parallel to the main transaction. So let's not try to verify the exact count. Author: Amit Kapila Reviewed-by: Sawada Masahiko Discussion: https://postgr.es/m/CA+fd4k5_pPAYRTDrO2PbtTOe0eHQpBvuqmCr8ic39uTNmR49Eg@mail.gmail.com
112 lines
3.1 KiB
Plaintext
112 lines
3.1 KiB
Plaintext
-- predictability
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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?column?
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----------
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init
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(1 row)
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CREATE TABLE stats_test(data text);
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-- function to wait for counters to advance
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CREATE FUNCTION wait_for_decode_stats(check_reset bool) RETURNS void AS $$
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DECLARE
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start_time timestamptz := clock_timestamp();
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updated bool;
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BEGIN
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-- we don't want to wait forever; loop will exit after 30 seconds
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FOR i IN 1 .. 300 LOOP
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-- check to see if all updates have been reset/updated
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SELECT CASE WHEN check_reset THEN (spill_txns = 0)
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ELSE (spill_txns > 0)
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END
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INTO updated
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FROM pg_stat_replication_slots WHERE name='regression_slot';
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exit WHEN updated;
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-- wait a little
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perform pg_sleep_for('100 milliseconds');
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-- reset stats snapshot so we can test again
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perform pg_stat_clear_snapshot();
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END LOOP;
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-- report time waited in postmaster log (where it won't change test output)
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RAISE LOG 'wait_for_decode_stats delayed % seconds',
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extract(epoch from clock_timestamp() - start_time);
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END
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$$ LANGUAGE plpgsql;
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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', NULL, NULL, 'skip-empty-xacts', '1');
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count
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-------
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5002
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(1 row)
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-- Check stats, wait for the stats collector to update. We can't test the
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-- exact stats count as that can vary if any background transaction (say by
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-- autovacuum) happens in parallel to the main transaction.
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SELECT wait_for_decode_stats(false);
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wait_for_decode_stats
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-----------------------
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(1 row)
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SELECT name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
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name | spill_txns | spill_count
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-----------------+------------+-------------
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regression_slot | t | t
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(1 row)
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-- reset the slot stats, and wait for stats collector to reset
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SELECT pg_stat_reset_replication_slot('regression_slot');
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pg_stat_reset_replication_slot
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--------------------------------
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(1 row)
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SELECT wait_for_decode_stats(true);
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wait_for_decode_stats
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-----------------------
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(1 row)
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SELECT name, spill_txns, spill_count FROM pg_stat_replication_slots;
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name | spill_txns | spill_count
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-----------------+------------+-------------
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regression_slot | 0 | 0
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(1 row)
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-- decode and check stats again.
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SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'skip-empty-xacts', '1');
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count
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-------
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5002
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(1 row)
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SELECT wait_for_decode_stats(false);
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wait_for_decode_stats
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-----------------------
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(1 row)
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SELECT name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
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name | spill_txns | spill_count
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-----------------+------------+-------------
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regression_slot | t | t
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(1 row)
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DROP FUNCTION wait_for_decode_stats(bool);
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DROP TABLE stats_test;
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SELECT pg_drop_replication_slot('regression_slot');
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pg_drop_replication_slot
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--------------------------
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(1 row)
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