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769bc31dc2
In the function `ts_hypercube_from_constraints` a hypercube is build from constraints which reference dimension slices in `dimension_slice`. As part of a run of `drop_chunks` or when a chunk is explicitly dropped as part of other operations, dimension slices can be removed from this table causing the dimension slices to be removed, which makes the hypercube reference non-existent dimension slices which subsequently causes a crash. This commit fixes this by adding a tuple lock on the dimension slices that are used to build the hypercube. If two `drop_chunks` are running concurrently, there can be a race if dimension slices are removed as a result removing a chunk. We treat this case in the same way as if the dimension slice was updated: report an error that another session locked the tuple. Fixes #1986
94 lines
3.1 KiB
SQL
94 lines
3.1 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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-- Hypertables can break as a result of race conditions, but we should
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-- still not crash when trying to truncate or delete the broken table.
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\c :TEST_DBNAME :ROLE_SUPERUSER
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CREATE VIEW missing_slices AS
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SELECT DISTINCT
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dimension_slice_id,
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constraint_name,
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attname AS column_name,
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pg_get_expr(conbin, conrelid) AS constraint_expr
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FROM
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_timescaledb_catalog.chunk_constraint cc
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JOIN _timescaledb_catalog.chunk ch ON cc.chunk_id = ch.id
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JOIN pg_constraint ON conname = constraint_name
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JOIN pg_namespace ns ON connamespace = ns.oid
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AND ns.nspname = ch.schema_name
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JOIN pg_attribute ON attnum = conkey[1]
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AND attrelid = conrelid
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WHERE
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dimension_slice_id NOT IN (SELECT id FROM _timescaledb_catalog.dimension_slice);
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-- To drop rows from dimension_slice table, we need to remove some
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-- constraints.
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ALTER TABLE _timescaledb_catalog.chunk_constraint
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DROP CONSTRAINT chunk_constraint_dimension_slice_id_fkey;
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CREATE TABLE chunk_test_int(time integer, temp float8, tag integer, color integer);
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SELECT create_hypertable('chunk_test_int', 'time', 'tag', 2, chunk_time_interval => 3);
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INSERT INTO chunk_test_int VALUES
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(4, 24.3, 1, 1),
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(4, 24.3, 2, 1),
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(10, 24.3, 2, 1);
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SELECT * FROM _timescaledb_catalog.dimension_slice ORDER BY id;
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SELECT DISTINCT
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chunk_id,
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dimension_slice_id,
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constraint_name,
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pg_get_expr(conbin, conrelid) AS constraint_expr
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FROM _timescaledb_catalog.chunk_constraint,
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LATERAL (
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SELECT *
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FROM pg_constraint JOIN pg_namespace ns ON connamespace = ns.oid
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WHERE conname = constraint_name
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) AS con
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ORDER BY chunk_id, dimension_slice_id;
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DELETE FROM _timescaledb_catalog.dimension_slice WHERE id = 1;
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SELECT * FROM missing_slices;
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-- Setting level to ERROR since warnings are printed in different
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-- order on PG11 and PG12.
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SET client_min_messages TO error;
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TRUNCATE TABLE chunk_test_int;
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DROP TABLE chunk_test_int;
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RESET client_min_messages;
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CREATE TABLE chunk_test_int(time integer, temp float8, tag integer, color integer);
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SELECT create_hypertable('chunk_test_int', 'time', 'tag', 2, chunk_time_interval => 3);
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INSERT INTO chunk_test_int VALUES
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(4, 24.3, 1, 1),
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(4, 24.3, 2, 1),
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(10, 24.3, 2, 1);
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SELECT DISTINCT
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chunk_id,
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dimension_slice_id,
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constraint_name,
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pg_get_expr(conbin, conrelid) AS constraint_expr
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FROM _timescaledb_catalog.chunk_constraint,
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LATERAL (
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SELECT *
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FROM pg_constraint JOIN pg_namespace ns ON connamespace = ns.oid
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WHERE conname = constraint_name
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) AS con
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ORDER BY chunk_id, dimension_slice_id;
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DELETE FROM _timescaledb_catalog.dimension_slice WHERE id = 5;
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SELECT * FROM missing_slices;
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-- Setting level to ERROR since warnings are printed in different
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-- order on PG11 and PG12.
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SET client_min_messages TO error;
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DROP TABLE chunk_test_int;
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RESET client_min_messages;
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