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4236825197
Author: Alexander Lakhin Discussion: https://postgr.es/m/f7e514cf-2446-21f1-a5d2-8c089a6e2168@gmail.com
47 lines
2.1 KiB
Ruby
47 lines
2.1 KiB
Ruby
# Test that a slot creation skips to restore serialized snapshot to reach
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# the consistent state.
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setup
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{
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DROP TABLE IF EXISTS tbl;
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CREATE TABLE tbl (val1 integer);
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}
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teardown
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{
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DROP TABLE tbl;
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SELECT 'stop' FROM pg_drop_replication_slot('slot0');
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SELECT 'stop' FROM pg_drop_replication_slot('slot1');
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}
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session "s0"
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setup { SET synchronous_commit = on; }
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step "s0_init" { SELECT 'init' FROM pg_create_logical_replication_slot('slot0', 'test_decoding'); }
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step "s0_begin" { BEGIN; }
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step "s0_insert1" { INSERT INTO tbl VALUES (1); }
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step "s0_insert2" { INSERT INTO tbl VALUES (2); }
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step "s0_commit" { COMMIT; }
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session "s1"
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setup { SET synchronous_commit = on; }
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step "s1_init" { SELECT 'init' FROM pg_create_logical_replication_slot('slot1', 'test_decoding'); }
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step "s1_get_changes_slot0" { SELECT data FROM pg_logical_slot_get_changes('slot0', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); }
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step "s1_get_changes_slot1" { SELECT data FROM pg_logical_slot_get_changes('slot1', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); }
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session "s2"
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setup { SET synchronous_commit = on ;}
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step "s2_checkpoint" { CHECKPOINT; }
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step "s2_get_changes_slot0" { SELECT data FROM pg_logical_slot_get_changes('slot0', NULL, NULL, 'skip-empty-xacts', '1', 'include-xids', '0'); }
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# While 'slot1' creation by "s1_init" waits for s0-transaction to commit, the
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# RUNNING_XACTS record is written by "s2_checkpoint" and "s2_get_changes_slot1"
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# serializes consistent snapshots to the disk at LSNs where are before
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# s0-transaction's commit. After s0-transaction commits, "s1_init" resumes but
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# must not restore any serialized snapshots and will reach the consistent state
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# when decoding a RUNNING_XACTS record generated after s0-transaction's commit.
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# We check if the get_changes on 'slot1' will not return any s0-transaction's
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# changes as its confirmed_flush_lsn will be after the s0-transaction's commit
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# record.
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permutation "s0_init" "s0_begin" "s0_insert1" "s1_init" "s2_checkpoint" "s2_get_changes_slot0" "s0_insert2" "s0_commit" "s1_get_changes_slot0" "s1_get_changes_slot1"
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