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b7718a1c1c
DML transactions on FK-child tables also get table locks on FK-parent tables. If there is a DML transaction holding such a lock, and a TOI transaction starts, the latter BF-aborts the former and puts itself into a waiting state. If at this moment another DML transaction on FK-child table starts, it doesn't check that the transaction waiting on a parent table lock is TOI, and it erroneously BF-aborts the waiting TOI transaction. The fix: don't roll back high-priority transaction waiting on a lock in InnoDB, instead roll back an incoming DML transaction. Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
32 lines
1.2 KiB
Text
32 lines
1.2 KiB
Text
connection node_2;
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connection node_1;
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connect con1_1,127.0.0.1,root,,test,$NODE_MYPORT_1;
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connect con1_2,127.0.0.1,root,,test,$NODE_MYPORT_1;
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CREATE TABLE t1(c1 INT PRIMARY KEY) ENGINE=InnoDB;
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CREATE TABLE t1_fk(c1 INT PRIMARY KEY, c2 INT, INDEX (c2), FOREIGN KEY (c2) REFERENCES t1(c1)) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (1);
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connection con1_1;
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SET DEBUG_SYNC = 'ib_after_row_insert WAIT_FOR bf_abort';
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INSERT INTO t1_fk VALUES (1, 1);
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connection con1_2;
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SET DEBUG_SYNC = 'ha_write_row_start SIGNAL may_alter WAIT_FOR may_insert';
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INSERT INTO t1_fk VALUES (2, 2);
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connection node_1;
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SET DEBUG_SYNC = 'now WAIT_FOR may_alter';
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SET DEBUG_SYNC = 'after_lock_table_for_trx SIGNAL may_insert WAIT_FOR alter_continue';
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ALTER TABLE t1 ADD COLUMN c2 INT;
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connection con1_1;
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ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
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connection con1_2;
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ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
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SET DEBUG_SYNC = 'now SIGNAL alter_continue';
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connection node_1;
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connection node_2;
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INSERT INTO t1 (c1, c2) VALUES (2, 2);
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connection node_1;
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SET DEBUG_SYNC = 'RESET';
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DROP TABLE t1_fk, t1;
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disconnect con1_1;
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disconnect con1_2;
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disconnect node_2;
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disconnect node_1;
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