mirror of https://github.com/citusdata/citus.git
111 lines
3.7 KiB
Plaintext
111 lines
3.7 KiB
Plaintext
\c - - - :master_port
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CREATE TABLE the_table (a int, b int, z bigserial);
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SELECT create_distributed_table('the_table', 'a');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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CREATE TABLE local (a int, b int);
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\c - - - :follower_master_port
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-- inserts normally do not work on a standby coordinator
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INSERT INTO the_table (a, b, z) VALUES (1, 2, 2);
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ERROR: writing to worker nodes is not currently allowed
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DETAIL: the database is read-only
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-- we can allow DML on a writable standby coordinator
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SET citus.writable_standby_coordinator TO on;
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INSERT INTO the_table (a, b, z) VALUES (1, 2, 2);
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SELECT * FROM the_table;
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a | b | z
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---------------------------------------------------------------------
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1 | 2 | 2
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(1 row)
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UPDATE the_table SET z = 3 WHERE a = 1;
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SELECT * FROM the_table;
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a | b | z
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---------------------------------------------------------------------
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1 | 2 | 3
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(1 row)
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DELETE FROM the_table WHERE a = 1;
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SELECT * FROM the_table;
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a | b | z
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---------------------------------------------------------------------
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(0 rows)
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-- drawing from a sequence is not possible
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INSERT INTO the_table (a, b) VALUES (1, 2);
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ERROR: cannot assign TransactionIds during recovery
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-- 2PC is not possible
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INSERT INTO the_table (a, b, z) VALUES (2, 3, 4), (5, 6, 7);
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ERROR: cannot assign TransactionIds during recovery
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-- COPY is not possible in 2PC mode
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COPY the_table (a, b, z) FROM STDIN WITH CSV;
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ERROR: cannot assign TransactionIds during recovery
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-- 1PC is possible
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SET citus.multi_shard_commit_protocol TO '1pc';
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INSERT INTO the_table (a, b, z) VALUES (2, 3, 4), (5, 6, 7);
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SELECT * FROM the_table ORDER BY a;
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a | b | z
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---------------------------------------------------------------------
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2 | 3 | 4
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5 | 6 | 7
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(2 rows)
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-- modifying CTEs are possible
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WITH del AS (DELETE FROM the_table RETURNING *)
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SELECT * FROM del ORDER BY a;
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a | b | z
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---------------------------------------------------------------------
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2 | 3 | 4
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5 | 6 | 7
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(2 rows)
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-- COPY is possible in 1PC mode
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COPY the_table (a, b, z) FROM STDIN WITH CSV;
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SELECT * FROM the_table ORDER BY a;
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a | b | z
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---------------------------------------------------------------------
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10 | 10 | 10
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11 | 11 | 11
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(2 rows)
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DELETE FROM the_table;
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-- DDL is not possible
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TRUNCATE the_table;
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ERROR: cannot execute TRUNCATE TABLE in a read-only transaction
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ALTER TABLE the_table ADD COLUMN c int;
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ERROR: cannot acquire lock mode AccessExclusiveLock on database objects while recovery is in progress
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HINT: Only RowExclusiveLock or less can be acquired on database objects during recovery.
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-- rollback is possible
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BEGIN;
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INSERT INTO the_table (a, b, z) VALUES (1, 2, 2);
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ROLLBACK;
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SELECT * FROM the_table ORDER BY a;
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a | b | z
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---------------------------------------------------------------------
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(0 rows)
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-- we should still disallow writes to local tables
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INSERT INTO local VALUES (1, 1);
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ERROR: cannot execute INSERT in a read-only transaction
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INSERT INTO local SELECT a, b FROM the_table;
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ERROR: cannot execute INSERT in a read-only transaction
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-- we shouldn't be able to create local tables
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CREATE TEMP TABLE local_copy_of_the_table AS SELECT * FROM the_table;
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ERROR: cannot execute CREATE TABLE AS in a read-only transaction
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\c "port=9070 dbname=regression options='-c\ citus.use_secondary_nodes=always\ -c\ citus.cluster_name=second-cluster'"
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-- separate follower formations currently cannot do writes
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SET citus.writable_standby_coordinator TO on;
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INSERT INTO the_table (a, b, z) VALUES (1, 2, 3);
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ERROR: writing to worker nodes is not currently allowed
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DETAIL: citus.use_secondary_nodes is set to 'always'
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SELECT * FROM the_table ORDER BY a;
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a | b | z
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---------------------------------------------------------------------
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(0 rows)
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\c - - - :master_port
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DROP TABLE the_table;
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