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8128a46827
The lock is created during page splitting after moving records and locks(lock_move_rec_list_(start|end)()) to the new page, and inheriting the locks to the supremum of left page from the successor of the infimum on right page. There is no need in such inheritance for READ COMMITTED isolation level and not-gap locks, so the fix is to add the corresponding condition in gap lock inheritance function. One more fix is to forbid gap lock inheritance if XA was prepared. Use the most significant bit of trx_t::n_ref to indicate that gap lock inheritance is forbidden. This fix is based on mysql/mysql-server@b063e52a83
34 lines
865 B
Text
34 lines
865 B
Text
CREATE TABLE t (
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`a` INT NOT NULL,
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`b` INT NOT NULL,
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PRIMARY KEY (`a`)
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) ENGINE=InnoDB;
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SET GLOBAL innodb_limit_optimistic_insert_debug = 3;
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INSERT INTO t VALUES(10, 0);
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INSERT INTO t VALUES(20, 0);
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INSERT INTO t VALUES(30, 0);
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SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
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XA START '1';
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REPLACE INTO t VALUES(10, 1);
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REPLACE INTO t VALUES(20, 1);
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SET DEBUG_SYNC= 'ib_after_row_insert SIGNAL inserted WAIT_FOR cont';
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REPLACE INTO t VALUES(30, 1);
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connect con1,localhost,root;
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SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
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XA START '2';
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SET DEBUG_SYNC= 'now WAIT_FOR inserted';
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INSERT INTO t VALUES(40, 2);
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SET DEBUG_SYNC= 'now SIGNAL cont';
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connection default;
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XA END '1';
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XA PREPARE '1';
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connection default;
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XA COMMIT '1';
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connection con1;
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XA END '2';
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XA PREPARE '2';
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XA COMMIT '2';
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disconnect con1;
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connection default;
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SET DEBUG_SYNC= "RESET";
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DROP TABLE t;
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