insert into on duplicate key update导致的cap锁以及死锁

CREATE TABLE `tb2002` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`c1` varchar(20) DEFAULT NULL,
`c2` varchar(20) DEFAULT NULL,
`c3` int(11) DEFAULT '0',
PRIMARY KEY (`id`),
UNIQUE KEY `idx_c1` (`c1`,`c2`)
) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8;


insert into tb2002(c1,c2) values('a','1');
insert into tb2002(c1,c2) values('f','1');


                                        
insert into tb2002(c1,c2) values('d','2') ON DUPLICATE KEY UPDATE c3=c3+1;            
insert into tb2002(c1,c2) values('c','1') ON DUPLICATE KEY UPDATE c3=c3+1;
insert into tb2002(c1,c2) values('d','1') ON DUPLICATE KEY UPDATE c3=c3+1;