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MDEV-28422 Page split breaks a gap lock

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btr_insert_into_right_sibling(): Inherit any gap lock from the
left sibling to the right sibling before inserting the record
to the right sibling and updating the node pointer(s).

lock_update_node_pointer(): Update locks in case a node pointer
will move.

Based on mysql/mysql-server@c7d93c274f
This commit is contained in:
Marko Mäkelä
2022-04-27 13:16:07 +03:00
parent b208030ef5
commit 0806592ac8
5 changed files with 118 additions and 7 deletions
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39
mysql-test/suite/innodb/t/gap_lock_split.test Normal file
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--source include/have_innodb.inc
--source include/have_sequence.inc
--source include/have_debug.inc
SET @save_frequency=@@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000)) ENGINE=InnoDB;
INSERT INTO t1 (id,val) SELECT 2*seq,'x' FROM seq_0_to_1023;
connect(con1,localhost,root,,);
# Prevent purge.
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connection default;
DELETE FROM t1 WHERE id=1788;
BEGIN;
# This will return no result, but should acquire a gap lock.
SELECT * FROM t1 WHERE id=1788 FOR UPDATE;
connection con1;
COMMIT;
source include/wait_all_purged.inc;
connection default;
INSERT INTO t1 (id,val) VALUES (1787, REPEAT('x',2000));
connection con1;
SET innodb_lock_wait_timeout=0;
--error ER_LOCK_WAIT_TIMEOUT
INSERT INTO t1 (id,val) VALUES (1788, 'x');
SELECT * FROM t1 WHERE id=1788 FOR UPDATE;
disconnect con1;
connection default;
COMMIT;
DROP TABLE t1;
SET GLOBAL innodb_purge_rseg_truncate_frequency=@save_frequency;