mirror of https://github.com/citusdata/citus.git
62 lines
1.9 KiB
PL/PgSQL
62 lines
1.9 KiB
PL/PgSQL
CREATE SCHEMA adaptive_executor;
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SET search_path TO adaptive_executor;
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CREATE TABLE test (x int, y int);
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SET citus.shard_count TO 4;
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SET citus.shard_replication_factor TO 1;
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SET citus.next_shard_id TO 801009000;
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SELECT create_distributed_table('test','x');
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-- Add 1 row to each shard
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SELECT get_shard_id_for_distribution_column('test', 1);
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INSERT INTO test VALUES (1,2);
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SELECT get_shard_id_for_distribution_column('test', 3);
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INSERT INTO test VALUES (3,2);
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SELECT get_shard_id_for_distribution_column('test', 6);
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INSERT INTO test VALUES (8,2);
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SELECT get_shard_id_for_distribution_column('test', 11);
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INSERT INTO test VALUES (11,2);
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-- Set a very high slow start to avoid opening parallel connections
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SET citus.executor_slow_start_interval TO '60s';
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SET citus.max_adaptive_executor_pool_size TO 2;
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BEGIN;
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SELECT count(*) FROM test a JOIN (SELECT x, pg_sleep(0.1) FROM test) b USING (x);
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SELECT sum(result::bigint) FROM run_command_on_workers($$
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SELECT count(*) FROM pg_stat_activity
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WHERE pid <> pg_backend_pid() AND query LIKE '%8010090%'
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$$);
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END;
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-- SELECT takes longer than slow start interval, should open multiple connections
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SET citus.executor_slow_start_interval TO '10ms';
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BEGIN;
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SELECT count(*) FROM test a JOIN (SELECT x, pg_sleep(0.2) FROM test) b USING (x);
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SELECT sum(result::bigint) FROM run_command_on_workers($$
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SELECT count(*) FROM pg_stat_activity
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WHERE pid <> pg_backend_pid() AND query LIKE '%8010090%'
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$$);
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END;
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CREATE OR REPLACE FUNCTION select_for_update()
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RETURNS void
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AS $$
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DECLARE
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my int;
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BEGIN
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SELECT y INTO my FROM test WHERE x = 1 FOR UPDATE;
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END;
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$$ LANGUAGE plpgsql;
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-- so that we can prove that we open a transaction block by logging below:
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-- "NOTICE: issuing BEGIN TRANSACTION ISOLATION LEVEL READ COMMITTED;..."
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SET citus.log_remote_commands TO on;
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SELECT select_for_update();
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SET citus.log_remote_commands TO off;
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DROP SCHEMA adaptive_executor CASCADE;
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