mirror of https://github.com/citusdata/citus.git
132 lines
4.5 KiB
Plaintext
132 lines
4.5 KiB
Plaintext
-- Test queries on a distributed table with shards on the coordinator
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CREATE SCHEMA coordinator_shouldhaveshards;
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SET search_path TO coordinator_shouldhaveshards;
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SET citus.next_shard_id TO 1503000;
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-- idempotently add node to allow this test to run without add_coordinator
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SET client_min_messages TO WARNING;
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SELECT 1 FROM master_add_node('<host>', :master_port, groupid => 0);
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?column?
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---------------------------------------------------------------------
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1
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(1 row)
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RESET client_min_messages;
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SELECT 1 FROM master_set_node_property('<host>', :master_port, 'shouldhaveshards', true);
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?column?
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---------------------------------------------------------------------
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1
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(1 row)
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SET citus.shard_replication_factor TO 1;
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CREATE TABLE test (x int, y int);
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SELECT create_distributed_table('test','x', colocate_with := 'none');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT count(*) FROM pg_dist_shard JOIN pg_dist_placement USING (shardid)
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WHERE logicalrelid = 'test'::regclass AND groupid = 0;
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count
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---------------------------------------------------------------------
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2
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(1 row)
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--- enable logging to see which tasks are executed locally
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SET client_min_messages TO LOG;
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SET citus.log_local_commands TO ON;
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-- INSERT..SELECT with COPY under the covers
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INSERT INTO test SELECT s,s FROM generate_series(2,100) s;
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-- router queries execute locally
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INSERT INTO test VALUES (1, 1);
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NOTICE: executing the command locally: INSERT INTO coordinator_shouldhaveshards.test_1503000 (x, y) VALUES (1, 1)
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SELECT y FROM test WHERE x = 1;
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NOTICE: executing the command locally: SELECT y FROM coordinator_shouldhaveshards.test_1503000 test WHERE (x OPERATOR(pg_catalog.=) 1)
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y
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---------------------------------------------------------------------
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1
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(1 row)
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-- multi-shard queries connect to <host>
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SELECT count(*) FROM test;
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count
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---------------------------------------------------------------------
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100
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(1 row)
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WITH a AS (SELECT * FROM test) SELECT count(*) FROM test;
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count
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---------------------------------------------------------------------
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100
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(1 row)
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-- multi-shard queries in transaction blocks execute locally
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BEGIN;
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SELECT y FROM test WHERE x = 1;
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NOTICE: executing the command locally: SELECT y FROM coordinator_shouldhaveshards.test_1503000 test WHERE (x OPERATOR(pg_catalog.=) 1)
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y
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---------------------------------------------------------------------
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1
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(1 row)
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SELECT count(*) FROM test;
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NOTICE: executing the command locally: SELECT count(*) AS count FROM coordinator_shouldhaveshards.test_1503000 test WHERE true
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NOTICE: executing the command locally: SELECT count(*) AS count FROM coordinator_shouldhaveshards.test_1503003 test WHERE true
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count
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---------------------------------------------------------------------
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100
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(1 row)
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END;
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BEGIN;
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SELECT y FROM test WHERE x = 1;
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NOTICE: executing the command locally: SELECT y FROM coordinator_shouldhaveshards.test_1503000 test WHERE (x OPERATOR(pg_catalog.=) 1)
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y
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---------------------------------------------------------------------
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1
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(1 row)
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SELECT count(*) FROM test;
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NOTICE: executing the command locally: SELECT count(*) AS count FROM coordinator_shouldhaveshards.test_1503000 test WHERE true
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NOTICE: executing the command locally: SELECT count(*) AS count FROM coordinator_shouldhaveshards.test_1503003 test WHERE true
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count
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---------------------------------------------------------------------
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100
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(1 row)
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END;
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-- DDL connects to locahost
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ALTER TABLE test ADD COLUMN z int;
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-- DDL after local execution
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BEGIN;
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SELECT y FROM test WHERE x = 1;
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NOTICE: executing the command locally: SELECT y FROM coordinator_shouldhaveshards.test_1503000 test WHERE (x OPERATOR(pg_catalog.=) 1)
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y
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---------------------------------------------------------------------
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1
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(1 row)
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ALTER TABLE test DROP COLUMN z;
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ERROR: cannot execute command because a local execution has accessed a placement in the transaction
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DETAIL: Some parallel commands cannot be executed if a previous command has already been executed locally
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HINT: Try re-running the transaction with "SET LOCAL citus.enable_local_execution TO OFF;"
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ROLLBACK;
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BEGIN;
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ALTER TABLE test DROP COLUMN z;
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SELECT y FROM test WHERE x = 1;
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y
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---------------------------------------------------------------------
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1
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(1 row)
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END;
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DELETE FROM test;
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DROP TABLE test;
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DROP SCHEMA coordinator_shouldhaveshards CASCADE;
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SELECT 1 FROM master_set_node_property('<host>', :master_port, 'shouldhaveshards', false);
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?column?
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---------------------------------------------------------------------
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1
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(1 row)
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