postgres-anomalies/spec/vignettes/isolation_serializable/02_write_skew_with_disjoint_sets_spec.log at ebfd9315668c505fc927df5081a434fba88bef8d · Aerdayne/postgres-anomalies · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
    [observer]	CREATE TABLE events (
    [observer]	  id text NOT NULL,
    [observer]	  available_seats integer NOT NULL CHECK (available_seats >= 0),
    [observer]	  PRIMARY KEY (id)
    [observer]	);	(3.3ms)
    [observer]	CREATE TABLE bookings (
    [observer]	  id integer PRIMARY KEY,
    [observer]	  customer_name text NOT NULL,
    [observer]	  seat_count integer NOT NULL,
    [observer]	  event_id text NOT NULL,
    [observer]	  FOREIGN KEY (event_id) REFERENCES events (id)
    [observer]	);	(3.7ms)
    [observer]	BEGIN ISOLATION LEVEL READ COMMITTED	(0.7ms)
    [observer]	INSERT INTO "events" ("id", "available_seats") VALUES ('event_a', 4) RETURNING "id"	(0.9ms)
    [observer]	INSERT INTO "bookings" ("id", "customer_name", "seat_count", "event_id") VALUES (1, 'Alice', 1, 'event_a') RETURNING "id"	(1.0ms)
    [observer]	INSERT INTO "bookings" ("id", "customer_name", "seat_count", "event_id") VALUES (2, 'Bob', 1, 'event_a') RETURNING "id"	(0.4ms)
    [observer]	COMMIT	(0.8ms)
       [alice]		BEGIN ISOLATION LEVEL SERIALIZABLE	(0.4ms)
       [alice]		SELECT SUM("bookings"."seat_count") FROM "bookings" WHERE "bookings"."id" IN (1, 2)	(1.4ms)
       [alice]		=> 2
         [bob]			BEGIN ISOLATION LEVEL SERIALIZABLE	(0.4ms)
         [bob]			SELECT SUM("bookings"."seat_count") FROM "bookings" WHERE "bookings"."customer_name" IN ('Alice', 'Bob') AND "bookings"."event_id" = 'event_a'	(1.3ms)
         [bob]			=> 2
       [alice]		UPDATE "bookings" SET "seat_count" = 2 WHERE "bookings"."id" = 1	(0.7ms)
       [alice]		COMMIT	(0.6ms)
         [bob]			UPDATE "bookings" SET "seat_count" = 2 WHERE "bookings"."customer_name" = 'Bob' AND "bookings"."event_id" = 'event_a'	(0.7ms)
         [bob]			ROLLBACK	(0.4ms)
         [bob]			-> raised ActiveRecord::SerializationFailure PG::TRSerializationFailure: ERROR:  could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during write.
HINT:  The transaction might succeed if retried.
         [bob]			BEGIN ISOLATION LEVEL SERIALIZABLE	(1.5ms)
         [bob]			SELECT SUM("bookings"."seat_count") FROM "bookings" WHERE "bookings"."customer_name" IN ('Alice', 'Bob') AND "bookings"."event_id" = 'event_a'	(1.0ms)
         [bob]			=> 3
         [bob]			COMMIT	(0.9ms)
    [observer]	SELECT SUM("bookings"."seat_count") FROM "bookings" WHERE "bookings"."customer_name" = 'Alice' AND "bookings"."event_id" = 'event_a'	(4.7ms)
    [observer]	=> 2
    [observer]	SELECT SUM("bookings"."seat_count") FROM "bookings" WHERE "bookings"."customer_name" = 'Bob' AND "bookings"."event_id" = 'event_a'	(8.1ms)
    [observer]	=> 1
    [observer]	DROP TABLE IF EXISTS bookings;	(8.3ms)
    [observer]	DROP TABLE IF EXISTS events;	(6.4ms)