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The test tends to fail if many parallel instances of it are executed: ``` mysqltest: At line 23: query 'ALTER TABLE t1 ADD PRIMARY KEY (f1)' failed: 1317: Query execution was interrupted ``` The `ALTER` fails because it is BF aborted due to an earlier `INSERT SELECT` that is being applied: ``` INSERT INTO t1 (f1) SELECT ... --connection node_2 SET GLOBAL wsrep_desync = TRUE; SET SESSION wsrep_on = FALSE; ALTER TABLE t1 ADD PRIMARY KEY (f1); SET SESSION wsrep_on = TRUE; SET GLOBAL wsrep_desync = FALSE; ``` And because the `ALTER` is executed with `wsrep_on = OFF`, it does not run in total order isolation. To avoid the problem it must be ensured that the `ALTER` only after the large `INSERT SELECT` is done. To do so it is sufficient to issue `SELECT COUNT(*) FROM t1;` from `node_2` before turning off wsrep. The `SELECT` will trigger `wsrep_sync_wait` and proceed only after the `INSERT SELECT` from node_1 is done.
60 lines
1.6 KiB
Plaintext
60 lines
1.6 KiB
Plaintext
#
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# Test the wsrep_desync + wsrep_on method for schema upgrades discussed at
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# http://www.slideshare.net/Severalnines/schema-upgrades-codershippresodec2013 , slide 30
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#
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--source include/big_test.inc
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--source include/galera_cluster.inc
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--source include/have_innodb.inc
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--connection node_1
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CREATE TABLE ten (f1 INTEGER);
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INSERT INTO ten VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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CREATE TABLE t1 (f1 INTEGER) Engine=InnoDB;
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# Insert some values before the ALTER
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INSERT INTO t1 (f1) SELECT 000000 + (10000 * a1.f1) + (1000 * a2.f1) + (100 * a3.f1) + (10 * a4.f1) + a5.f1 FROM ten AS a1, ten AS a2, ten AS a3, ten AS a4, ten AS a5;
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--connection node_2
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SELECT COUNT(*) = 100000 FROM t1;
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SET GLOBAL wsrep_desync = TRUE;
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SET SESSION wsrep_on = FALSE;
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ALTER TABLE t1 ADD PRIMARY KEY (f1);
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SET SESSION wsrep_on = TRUE;
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SET GLOBAL wsrep_desync = FALSE;
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# Insert even more data after the ALTER has completed
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INSERT INTO t1 (f1) SELECT 100000 + (10000 * a1.f1) + (1000 * a2.f1) + (100 * a3.f1) + (10 * a4.f1) + a5.f1 FROM ten AS a1, ten AS a2, ten AS a3, ten AS a4, ten AS a5;
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SELECT COUNT(*) = 200000 FROM t1;
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SELECT MAX(f1) = 199999 FROM t1;
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--connection node_1
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SELECT COUNT(*) = 200000 FROM t1;
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SELECT MAX(f1) = 199999 FROM t1;
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SET GLOBAL wsrep_desync = TRUE;
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SET SESSION wsrep_on = FALSE;
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ALTER TABLE t1 ADD PRIMARY KEY (f1);
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SET SESSION wsrep_on = TRUE;
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SET GLOBAL wsrep_desync = FALSE;
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# Insert some conflicting values after the ALTER has been applied on all nodes.
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--connection node_2
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--error ER_DUP_ENTRY
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INSERT INTO t1 (f1) VALUES (1);
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--connection node_1
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--error ER_DUP_ENTRY
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INSERT INTO t1 (f1) VALUES (100);
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DROP TABLE t1;
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DROP TABLE ten;
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