最近工作太忙了,抽点时间赶紧写一下,最近公司进行抽奖活动,涉及到预扣库存,秒杀等高并发的情况,所以总结写一下心得。大神请忽略哈哈哈,欢迎大家一起分享交流。
在分布式系统中,我们经常会需要进行加锁的操作,而在分布式中加锁的中间件又有很多中方式,譬如常用的Redis,Zoookper,Memcached,Chubby等,或者我们也可以使用MySQL上的锁机制( Mysql 并发事务会引起更新丢失问题),所以在分布式系统中,我们会进行加锁处理。下面简单介绍一下上面几种锁的基本原理(详细的大家可以百度哈哈哈哈)
add
命令。此命令是原子性操作,只有在 key
不存在的情况下,才能 add
成功,也就 意味着线程得到了锁。setnx
命令。此命令同样是原子性操作,只有在 key
不存在的 情况下,才能 set
成功。具体的技术点大家都可以问度娘,我们这次主要是总结一下MySQL中的锁机制(悲观锁&乐观锁)
悲观锁,正如其名,具有强烈的独占和排他特性。它指的是对数据被外界(包括本系统当前的其他事务,以及来自外部系统的事务处理)修改持保守态度,因此,在整个数据处理过程中,将数据处于锁定状态。悲观锁的实现,往往依靠数据库提供的锁机制(也只有数据库层提供的锁机制才能真正保证数据访问的排他性,否则,即使在本系统中实现了加锁机制,也无法保证外部系统不会修改数据)(以上内容来自百度百科)。不过我们简单的来讲就是类似我们Java中的(1.7前重量级锁)Synchronized(关键字),只要我们需要同步执行我们的代码块,就加上Synchronized,JVM底层就能保证其线程安全性(只限制在单体架构上,SOA架构下Synchronized是不能做到这一点的,需要用到我们上面总结的分布式锁机制)。那再MySql中如何实现一把悲观锁呢?我们直接上代码:
准备表数据:
DROP DATABASE IF EXISTS cyhTest;
CREATE DATABASE cyhTest;
USE cyhTest;
DROP TABLE IF EXISTS employee;
CREATE TABLE IF NOT EXISTS employee (
id INTEGER NOT NULL,
money INTEGER,
version INTEGER,
PRIMARY KEY (id)
)
ENGINE = INNODB;
INSERT INTO employee VALUE (1, 0, 1);
SELECT * FROM employee;
测试一下(条件):
第一步:两个终端均关闭自动提交
左边:
右边:
第二步:左边利用 select .... for update 的悲观锁语法锁住记录
select * from employee where id = 1 for update;
第三步:右边也尝试利用 select .... for update 的悲观锁语法锁住记录
可以看到,Sql语句被挂起(被阻塞)!提示:如果被阻塞的时间太长,会提示如下:
第四步:左边执行更新操作并提交事务
update employee set money = 0 + 1 where id = 1;
commit;
执行结果:
执行结果分析:
第五步:查看右边Sql语句的变化
执行分析:
结论:
可以看到,当左边(事务A)使用了 select ... for update 的悲观锁后,右边(事务B)再想使用将被阻塞,同时,阻塞被解除后事务B能看到事务A对数据的修改,所以,这就可以很好地解决并发事务的更新丢失问题啦(诚然,这也是人家悲观锁的分内事)
Mapper层(XML文件):
提示:这里是 SELCT ... FOR UPDATE
Service 层:
@Transactional(rollbackFor = RuntimeException.class)
public void increaseMoneyWithPessimisticLock(Integer id) {
Employee employee = employeeMapper.findByIdWithPessimisticLock(id);
final Integer oldMoney = employee.getMoney();
LOGGER.info("oldMoney: {}", oldMoney);
employee.setMoney(oldMoney + 1);
employeeMapper.updateEmployee(employee);
}
提示:第3行中的 findByIdWithPessimisticLock() 方法就对应上面XML文件中的Mapper,有悲观锁
应用层(测试代码):
private void increaseMoneyWithPessimisticLock() {
int threadCount = 100;
while (threadCount-- > 0) {
new Thread(() -> employeeService.increaseMoneyWithPessimisticLock(1)).start();
}
}
提示:100根线程,每个线程将Money值加1,预期结果是100
查询数据库&查看结果
SELECT * FROM employee;
查看输出日志:
2019-11-26 15:12:14,335 INFO [Thread-5] (EmployeeService.java:36) - oldMoney: 0
2019-11-26 15:12:14,343 INFO [Thread-25] (EmployeeService.java:36) - oldMoney: 1
2019-11-26 15:12:14,345 INFO [Thread-27] (EmployeeService.java:36) - oldMoney: 2
2019-11-26 15:12:14,347 INFO [Thread-23] (EmployeeService.java:36) - oldMoney: 3
2019-11-26 15:12:14,349 INFO [Thread-13] (EmployeeService.java:36) - oldMoney: 4
2019-11-26 15:12:14,350 INFO [Thread-38] (EmployeeService.java:36) - oldMoney: 5
2019-11-26 15:12:14,351 INFO [Thread-24] (EmployeeService.java:36) - oldMoney: 6
2019-11-26 15:12:14,353 INFO [Thread-4] (EmployeeService.java:36) - oldMoney: 7
2019-11-26 15:12:14,355 INFO [Thread-26] (EmployeeService.java:36) - oldMoney: 8
2019-11-26 15:12:14,357 INFO [Thread-8] (EmployeeService.java:36) - oldMoney: 9
2019-11-26 15:12:14,360 INFO [Thread-3] (EmployeeService.java:36) - oldMoney: 10
2019-11-26 15:12:14,361 INFO [Thread-81] (EmployeeService.java:36) - oldMoney: 11
2019-11-26 15:12:14,363 INFO [Thread-20] (EmployeeService.java:36) - oldMoney: 12
2019-11-26 15:12:14,365 INFO [Thread-40] (EmployeeService.java:36) - oldMoney: 13
2019-11-26 15:12:14,366 INFO [Thread-29] (EmployeeService.java:36) - oldMoney: 14
2019-11-26 15:12:14,453 INFO [Thread-14] (EmployeeService.java:36) - oldMoney: 15
2019-11-26 15:12:14,475 INFO [Thread-7] (EmployeeService.java:36) - oldMoney: 16
2019-11-26 15:12:14,485 INFO [Thread-11] (EmployeeService.java:36) - oldMoney: 17
2019-11-26 15:12:14,488 INFO [Thread-48] (EmployeeService.java:36) - oldMoney: 18
2019-11-26 15:12:14,491 INFO [Thread-47] (EmployeeService.java:36) - oldMoney: 19
2019-11-26 15:12:14,494 INFO [Thread-12] (EmployeeService.java:36) - oldMoney: 20
2019-11-26 15:12:14,497 INFO [Thread-72] (EmployeeService.java:36) - oldMoney: 21
2019-11-26 15:12:14,500 INFO [Thread-46] (EmployeeService.java:36) - oldMoney: 22
2019-11-26 15:12:14,501 INFO [Thread-44] (EmployeeService.java:36) - oldMoney: 23
2019-11-26 15:12:14,503 INFO [Thread-45] (EmployeeService.java:36) - oldMoney: 24
2019-11-26 15:12:14,504 INFO [Thread-41] (EmployeeService.java:36) - oldMoney: 25
2019-11-26 15:12:14,505 INFO [Thread-9] (EmployeeService.java:36) - oldMoney: 26
2019-11-26 15:12:14,507 INFO [Thread-19] (EmployeeService.java:36) - oldMoney: 27
2019-11-26 15:12:14,508 INFO [Thread-55] (EmployeeService.java:36) - oldMoney: 28
2019-11-26 15:12:14,509 INFO [Thread-36] (EmployeeService.java:36) - oldMoney: 29
2019-11-26 15:12:14,518 INFO [Thread-43] (EmployeeService.java:36) - oldMoney: 30
2019-11-26 15:12:14,547 INFO [Thread-53] (EmployeeService.java:36) - oldMoney: 31
2019-11-26 15:12:14,556 INFO [Thread-52] (EmployeeService.java:36) - oldMoney: 32
2019-11-26 15:12:14,558 INFO [Thread-51] (EmployeeService.java:36) - oldMoney: 33
2019-11-26 15:12:14,560 INFO [Thread-50] (EmployeeService.java:36) - oldMoney: 34
2019-11-26 15:12:14,562 INFO [Thread-32] (EmployeeService.java:36) - oldMoney: 35
2019-11-26 15:12:14,563 INFO [Thread-85] (EmployeeService.java:36) - oldMoney: 36
2019-11-26 15:12:14,565 INFO [Thread-84] (EmployeeService.java:36) - oldMoney: 37
2019-11-26 15:12:14,567 INFO [Thread-33] (EmployeeService.java:36) - oldMoney: 38
2019-11-26 15:12:14,568 INFO [Thread-82] (EmployeeService.java:36) - oldMoney: 39
2019-11-26 15:12:14,570 INFO [Thread-34] (EmployeeService.java:36) - oldMoney: 40
2019-11-26 15:12:14,571 INFO [Thread-35] (EmployeeService.java:36) - oldMoney: 41
2019-11-26 15:12:14,573 INFO [Thread-83] (EmployeeService.java:36) - oldMoney: 42
2019-11-26 15:12:14,574 INFO [Thread-42] (EmployeeService.java:36) - oldMoney: 43
2019-11-26 15:12:14,575 INFO [Thread-22] (EmployeeService.java:36) - oldMoney: 44
2019-11-26 15:12:14,585 INFO [Thread-30] (EmployeeService.java:36) - oldMoney: 45
2019-11-26 15:12:14,586 INFO [Thread-28] (EmployeeService.java:36) - oldMoney: 46
2019-11-26 15:12:14,613 INFO [Thread-16] (EmployeeService.java:36) - oldMoney: 47
2019-11-26 15:12:14,615 INFO [Thread-17] (EmployeeService.java:36) - oldMoney: 48
2019-11-26 15:12:14,616 INFO [Thread-21] (EmployeeService.java:36) - oldMoney: 49
2019-11-26 15:12:14,618 INFO [Thread-18] (EmployeeService.java:36) - oldMoney: 50
2019-11-26 15:12:14,619 INFO [Thread-37] (EmployeeService.java:36) - oldMoney: 51
2019-11-26 15:12:14,621 INFO [Thread-39] (EmployeeService.java:36) - oldMoney: 52
2019-11-26 15:12:14,623 INFO [Thread-2] (EmployeeService.java:36) - oldMoney: 53
2019-11-26 15:12:14,624 INFO [Thread-1] (EmployeeService.java:36) - oldMoney: 54
2019-11-26 15:12:14,626 INFO [Thread-10] (EmployeeService.java:36) - oldMoney: 55
2019-11-26 15:12:14,627 INFO [Thread-15] (EmployeeService.java:36) - oldMoney: 56
2019-11-26 15:12:14,628 INFO [Thread-56] (EmployeeService.java:36) - oldMoney: 57
2019-11-26 15:12:14,630 INFO [Thread-54] (EmployeeService.java:36) - oldMoney: 58
2019-11-26 15:12:14,632 INFO [Thread-31] (EmployeeService.java:36) - oldMoney: 59
2019-11-26 15:12:14,642 INFO [Thread-57] (EmployeeService.java:36) - oldMoney: 60
2019-11-26 15:12:14,645 INFO [Thread-6] (EmployeeService.java:36) - oldMoney: 61
2019-11-26 15:12:14,672 INFO [Thread-62] (EmployeeService.java:36) - oldMoney: 62
2019-11-26 15:12:14,677 INFO [Thread-59] (EmployeeService.java:36) - oldMoney: 63
2019-11-26 15:12:14,679 INFO [Thread-61] (EmployeeService.java:36) - oldMoney: 64
2019-11-26 15:12:14,680 INFO [Thread-58] (EmployeeService.java:36) - oldMoney: 65
2019-11-26 15:12:14,681 INFO [Thread-80] (EmployeeService.java:36) - oldMoney: 66
2019-11-26 15:12:14,682 INFO [Thread-76] (EmployeeService.java:36) - oldMoney: 67
2019-11-26 15:12:14,684 INFO [Thread-78] (EmployeeService.java:36) - oldMoney: 68
2019-11-26 15:12:14,685 INFO [Thread-100] (EmployeeService.java:36) - oldMoney: 69
2019-11-26 15:12:14,686 INFO [Thread-99] (EmployeeService.java:36) - oldMoney: 70
2019-11-26 15:12:14,688 INFO [Thread-79] (EmployeeService.java:36) - oldMoney: 71
2019-11-26 15:12:14,689 INFO [Thread-94] (EmployeeService.java:36) - oldMoney: 72
2019-11-26 15:12:14,690 INFO [Thread-60] (EmployeeService.java:36) - oldMoney: 73
2019-11-26 15:12:14,691 INFO [Thread-77] (EmployeeService.java:36) - oldMoney: 74
2019-11-26 15:12:14,709 INFO [Thread-95] (EmployeeService.java:36) - oldMoney: 75
2019-11-26 15:12:14,711 INFO [Thread-96] (EmployeeService.java:36) - oldMoney: 76
2019-11-26 15:12:14,712 INFO [Thread-98] (EmployeeService.java:36) - oldMoney: 77
2019-11-26 15:12:14,738 INFO [Thread-75] (EmployeeService.java:36) - oldMoney: 78
2019-11-26 15:12:14,740 INFO [Thread-74] (EmployeeService.java:36) - oldMoney: 79
2019-11-26 15:12:14,741 INFO [Thread-73] (EmployeeService.java:36) - oldMoney: 80
2019-11-26 15:12:14,742 INFO [Thread-71] (EmployeeService.java:36) - oldMoney: 81
2019-11-26 15:12:14,743 INFO [Thread-69] (EmployeeService.java:36) - oldMoney: 82
2019-11-26 15:12:14,745 INFO [Thread-70] (EmployeeService.java:36) - oldMoney: 83
2019-11-26 15:12:14,746 INFO [Thread-68] (EmployeeService.java:36) - oldMoney: 84
2019-11-26 15:12:14,748 INFO [Thread-66] (EmployeeService.java:36) - oldMoney: 85
2019-11-26 15:12:14,749 INFO [Thread-67] (EmployeeService.java:36) - oldMoney: 86
2019-11-26 15:12:14,751 INFO [Thread-64] (EmployeeService.java:36) - oldMoney: 87
2019-11-26 15:12:14,754 INFO [Thread-65] (EmployeeService.java:36) - oldMoney: 88
2019-11-26 15:12:14,755 INFO [Thread-63] (EmployeeService.java:36) - oldMoney: 89
2019-11-26 15:12:14,767 INFO [Thread-97] (EmployeeService.java:36) - oldMoney: 90
2019-11-26 15:12:14,769 INFO [Thread-93] (EmployeeService.java:36) - oldMoney: 91
2019-11-26 15:12:14,770 INFO [Thread-49] (EmployeeService.java:36) - oldMoney: 92
2019-11-26 15:12:14,796 INFO [Thread-92] (EmployeeService.java:36) - oldMoney: 93
2019-11-26 15:12:14,801 INFO [Thread-91] (EmployeeService.java:36) - oldMoney: 94
2019-11-26 15:12:14,803 INFO [Thread-89] (EmployeeService.java:36) - oldMoney: 95
2019-11-26 15:12:14,803 INFO [Thread-90] (EmployeeService.java:36) - oldMoney: 96
2019-11-26 15:12:14,804 INFO [Thread-88] (EmployeeService.java:36) - oldMoney: 97
2019-11-26 15:12:14,806 INFO [Thread-87] (EmployeeService.java:36) - oldMoney: 98
2019-11-26 15:12:14,807 INFO [Thread-86] (EmployeeService.java:36) - oldMoney: 99
可以看到,oldMoney 值由0到99依次严格递增且不重复(这就是想要的效果)。
乐观锁机制采取了更加宽松的加锁机制。悲观锁大多数情况下依靠数据库的锁机制实现,以保证操作最大程度的独占性。但随之而来的就是数据库 性能的大量开销,特别是对长事务而言,这样的开销往往无法承受。相对悲观锁而言,乐观锁更倾向于开发运用。乐观锁的特点是先进行业务操作,不到万不得已不会去拿锁。乐观地认为拿锁多半会是成功的,因此在完成业务操作需要实际更新数据的最后一步再去拿一下锁。个人理解乐观锁更加相似于CAS操作,或者更加贴切来说有点类似于我们在版本控制工具中得SVN与Git得原理,当修改了某个文件需要提交的时候,它会检查文件的当前版本是否与服务器上的一致,如果一致那就可以直接提交,如果不一致,那就必须先更新服务器上的最新代码然后再提交(也就是先将这个文件的版本更新成和服务器一样的版本)。
3.1 如何实现乐观锁
乐观锁在数据库中的实现完全是要靠逻辑支撑的,数据库本身并不提供支持,而是需要开发者自己来实现。常用的两种做法:版本号控制或者时间戳控制。
版本号控制原理:
我们以最为常用的version版本号控制,进行乐观锁
Mapper层(XML文件):
UPDATE employee SET money = #{e.money}, version = #{e.version} + 1 WHERE id = #{e.id} AND #{e.version} = version
提示:
Service 层:
1 /**
2 * 失败尝试
3 * @param id
4 */
5 public void increaseMoneyWithOptimisticLock(Integer id) {
6 int tryTimes = 0;
7 while (true) {
8 tryTimes++;
9 if (internalIncreaseMoneyWithOptimisticLock(id) != 0) {
10 // 说明更新成功,直接退出
11 break;
12 }
13 if (tryTimes == 200) {
14 // 达到最大重试次数,退出
15 break;
16 }
17 try {
18 // 休息一段时间后再重试
19 TimeUnit.MILLISECONDS.sleep(new Random().nextInt(1000));
20 } catch (InterruptedException e) {
21 e.printStackTrace();
22 Thread.currentThread().interrupt();
23 }
24 }
25 LOGGER.info("tryTimes: {}", tryTimes);
26 }
27
28 /**
29 * 查找Employee对象,并进行更新
30 * @param id
31 * @return
32 */
33 @Transactional(rollbackFor = RuntimeException.class)
34 public Integer internalIncreaseMoneyWithOptimisticLock(Integer id) {
35 Employee employee = employeeMapper.findById(id);
36 final Integer oldMoney = employee.getMoney();
37 LOGGER.info("oldMoney: {}", oldMoney);
38 employee.setMoney(oldMoney + 1);
39 return employeeMapper.updateEmployeeWithOptimisticLock(employee);
40 }
提示:
应用层(测试代码):
private void increaseMoneyWithOptimisticLock() {
int threadCount = 100;
while (threadCount-- > 0) {
new Thread(() -> employeeService.increaseMoneyWithOptimisticLock(1)).start();
}
}
提示:100根线程,每个线程将Money值加1,预期结果是Money的值在之前的基础上增加100
查询数据库&查看结果:
之前Money=100,现在预期增加100,所以现在Money=200符合预期。同时,version 字段的值也由最初的1更新为101(也被更新了100次,每次加一)。
查看输出日志:
2019-11-26 16:24:07,851 INFO [Thread-36] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,853 INFO [Thread-54] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,856 INFO [Thread-55] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,856 INFO [Thread-45] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,858 INFO [Thread-56] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,858 INFO [Thread-53] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,858 INFO [Thread-33] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,859 INFO [Thread-57] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,859 INFO [Thread-31] (EmployeeService.java:77) - oldMoney: 100
2019-11-26 16:24:07,863 INFO [Thread-30] (EmployeeService.java:77) - oldMoney: 101
2019-11-26 16:24:07,868 INFO [Thread-29] (EmployeeService.java:77) - oldMoney: 101
2019-11-26 16:24:07,880 INFO [Thread-75] (EmployeeService.java:77) - oldMoney: 101
2019-11-26 16:24:07,881 INFO [Thread-76] (EmployeeService.java:77) - oldMoney: 102
2019-11-26 16:24:07,882 INFO [Thread-78] (EmployeeService.java:77) - oldMoney: 102
2019-11-26 16:24:07,883 INFO [Thread-77] (EmployeeService.java:77) - oldMoney: 102
2019-11-26 16:24:07,885 INFO [Thread-79] (EmployeeService.java:77) - oldMoney: 103
2019-11-26 16:24:07,887 INFO [Thread-80] (EmployeeService.java:77) - oldMoney: 103
2019-11-26 16:24:07,888 INFO [Thread-28] (EmployeeService.java:77) - oldMoney: 104
2019-11-26 16:24:07,890 INFO [Thread-27] (EmployeeService.java:77) - oldMoney: 104
2019-11-26 16:24:07,892 INFO [Thread-26] (EmployeeService.java:77) - oldMoney: 105
2019-11-26 16:24:07,894 INFO [Thread-25] (EmployeeService.java:77) - oldMoney: 105
2019-11-26 16:24:07,895 INFO [Thread-24] (EmployeeService.java:77) - oldMoney: 106
2019-11-26 16:24:07,897 INFO [Thread-83] (EmployeeService.java:77) - oldMoney: 106
2019-11-26 16:24:07,898 INFO [Thread-82] (EmployeeService.java:77) - oldMoney: 106
2019-11-26 16:24:07,900 INFO [Thread-84] (EmployeeService.java:77) - oldMoney: 107
2019-11-26 16:24:07,904 INFO [Thread-21] (EmployeeService.java:77) - oldMoney: 108
2019-11-26 16:24:07,906 INFO [Thread-20] (EmployeeService.java:77) - oldMoney: 109
2019-11-26 16:24:07,907 INFO [Thread-6] (EmployeeService.java:77) - oldMoney: 109
2019-11-26 16:24:07,908 INFO [Thread-9] (EmployeeService.java:77) - oldMoney: 110
2019-11-26 16:24:07,909 INFO [Thread-85] (EmployeeService.java:77) - oldMoney: 110
2019-11-26 16:24:07,909 INFO [Thread-86] (EmployeeService.java:77) - oldMoney: 111
2019-11-26 16:24:07,911 INFO [Thread-91] (EmployeeService.java:77) - oldMoney: 111
2019-11-26 16:24:07,912 INFO [Thread-81] (EmployeeService.java:77) - oldMoney: 112
2019-11-26 16:24:07,913 INFO [Thread-90] (EmployeeService.java:77) - oldMoney: 112
2019-11-26 16:24:07,915 INFO [Thread-96] (EmployeeService.java:77) - oldMoney: 112
2019-11-26 16:24:07,924 INFO [Thread-97] (EmployeeService.java:77) - oldMoney: 113
2019-11-26 16:24:07,926 INFO [Thread-36] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,928 INFO [Thread-18] (EmployeeService.java:77) - oldMoney: 113
2019-11-26 16:24:07,929 INFO [Thread-4] (EmployeeService.java:77) - oldMoney: 113
2019-11-26 16:24:07,932 INFO [Thread-94] (EmployeeService.java:77) - oldMoney: 114
2019-11-26 16:24:07,934 INFO [Thread-12] (EmployeeService.java:77) - oldMoney: 114
2019-11-26 16:24:07,935 INFO [Thread-93] (EmployeeService.java:77) - oldMoney: 114
2019-11-26 16:24:07,939 INFO [Thread-92] (EmployeeService.java:77) - oldMoney: 115
2019-11-26 16:24:07,940 INFO [Thread-69] (EmployeeService.java:77) - oldMoney: 115
2019-11-26 16:24:07,960 INFO [Thread-86] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,961 INFO [Thread-9] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,960 INFO [Thread-75] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,962 INFO [Thread-33] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,963 INFO [Thread-87] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,963 INFO [Thread-6] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,964 INFO [Thread-20] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,964 INFO [Thread-21] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,964 INFO [Thread-90] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,965 INFO [Thread-26] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,965 INFO [Thread-28] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,965 INFO [Thread-83] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,966 INFO [Thread-76] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,966 INFO [Thread-79] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,967 INFO [Thread-84] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:07,974 INFO [Thread-16] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,974 INFO [Thread-17] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,974 INFO [Thread-89] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,975 INFO [Thread-13] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,976 INFO [Thread-7] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,976 INFO [Thread-100] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,976 INFO [Thread-95] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,978 INFO [Thread-88] (EmployeeService.java:77) - oldMoney: 116
2019-11-26 16:24:07,978 INFO [Thread-8] (EmployeeService.java:77) - oldMoney: 117
2019-11-26 16:24:07,979 INFO [Thread-11] (EmployeeService.java:77) - oldMoney: 117
2019-11-26 16:24:07,980 INFO [Thread-5] (EmployeeService.java:77) - oldMoney: 118
2019-11-26 16:24:07,980 INFO [Thread-19] (EmployeeService.java:77) - oldMoney: 118
2019-11-26 16:24:07,980 INFO [Thread-22] (EmployeeService.java:77) - oldMoney: 118
2019-11-26 16:24:07,981 INFO [Thread-2] (EmployeeService.java:77) - oldMoney: 119
2019-11-26 16:24:07,981 INFO [Thread-23] (EmployeeService.java:77) - oldMoney: 119
2019-11-26 16:24:07,982 INFO [Thread-35] (EmployeeService.java:77) - oldMoney: 119
2019-11-26 16:24:07,982 INFO [Thread-32] (EmployeeService.java:77) - oldMoney: 119
2019-11-26 16:24:07,983 INFO [Thread-34] (EmployeeService.java:77) - oldMoney: 120
2019-11-26 16:24:07,983 INFO [Thread-37] (EmployeeService.java:77) - oldMoney: 120
2019-11-26 16:24:07,984 INFO [Thread-38] (EmployeeService.java:77) - oldMoney: 120
2019-11-26 16:24:07,985 INFO [Thread-39] (EmployeeService.java:77) - oldMoney: 121
2019-11-26 16:24:07,985 INFO [Thread-40] (EmployeeService.java:77) - oldMoney: 121
2019-11-26 16:24:07,986 INFO [Thread-41] (EmployeeService.java:77) - oldMoney: 121
2019-11-26 16:24:07,986 INFO [Thread-43] (EmployeeService.java:77) - oldMoney: 121
2019-11-26 16:24:07,987 INFO [Thread-44] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,988 INFO [Thread-48] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,988 INFO [Thread-49] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,989 INFO [Thread-50] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,986 INFO [Thread-42] (EmployeeService.java:77) - oldMoney: 121
2019-11-26 16:24:07,990 INFO [Thread-52] (EmployeeService.java:77) - oldMoney: 123
2019-11-26 16:24:07,989 INFO [Thread-51] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,988 INFO [Thread-47] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,987 INFO [Thread-46] (EmployeeService.java:77) - oldMoney: 122
2019-11-26 16:24:07,991 INFO [Thread-60] (EmployeeService.java:77) - oldMoney: 123
2019-11-26 16:24:07,990 INFO [Thread-58] (EmployeeService.java:77) - oldMoney: 123
2019-11-26 16:24:07,992 INFO [Thread-64] (EmployeeService.java:77) - oldMoney: 124
2019-11-26 16:24:07,992 INFO [Thread-65] (EmployeeService.java:77) - oldMoney: 124
2019-11-26 16:24:07,992 INFO [Thread-61] (EmployeeService.java:77) - oldMoney: 124
2019-11-26 16:24:07,993 INFO [Thread-63] (EmployeeService.java:77) - oldMoney: 125
2019-11-26 16:24:07,995 INFO [Thread-68] (EmployeeService.java:77) - oldMoney: 125
2019-11-26 16:24:07,995 INFO [Thread-67] (EmployeeService.java:77) - oldMoney: 125
2019-11-26 16:24:07,995 INFO [Thread-15] (EmployeeService.java:77) - oldMoney: 125
2019-11-26 16:24:07,996 INFO [Thread-66] (EmployeeService.java:77) - oldMoney: 125
2019-11-26 16:24:07,997 INFO [Thread-99] (EmployeeService.java:77) - oldMoney: 126
2019-11-26 16:24:07,998 INFO [Thread-98] (EmployeeService.java:77) - oldMoney: 126
2019-11-26 16:24:07,998 INFO [Thread-74] (EmployeeService.java:77) - oldMoney: 126
2019-11-26 16:24:08,002 INFO [Thread-92] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,002 INFO [Thread-73] (EmployeeService.java:77) - oldMoney: 127
2019-11-26 16:24:08,002 INFO [Thread-18] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,004 INFO [Thread-62] (EmployeeService.java:77) - oldMoney: 127
2019-11-26 16:24:08,004 INFO [Thread-27] (EmployeeService.java:77) - oldMoney: 127
2019-11-26 16:24:08,005 INFO [Thread-46] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,006 INFO [Thread-59] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,006 INFO [Thread-71] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,006 INFO [Thread-3] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,007 INFO [Thread-56] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,008 INFO [Thread-72] (EmployeeService.java:77) - oldMoney: 128
2019-11-26 16:24:08,008 INFO [Thread-93] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,010 INFO [Thread-70] (EmployeeService.java:77) - oldMoney: 129
2019-11-26 16:24:08,010 INFO [Thread-10] (EmployeeService.java:77) - oldMoney: 129
2019-11-26 16:24:08,010 INFO [Thread-17] (EmployeeService.java:77) - oldMoney: 129
2019-11-26 16:24:08,011 INFO [Thread-14] (EmployeeService.java:77) - oldMoney: 129
2019-11-26 16:24:08,012 INFO [Thread-1] (EmployeeService.java:77) - oldMoney: 130
2019-11-26 16:24:08,032 INFO [Thread-5] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,032 INFO [Thread-49] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,032 INFO [Thread-87] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,032 INFO [Thread-64] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,032 INFO [Thread-8] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,033 INFO [Thread-41] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,033 INFO [Thread-52] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,034 INFO [Thread-2] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,034 INFO [Thread-72] (EmployeeService.java:77) - oldMoney: 131
2019-11-26 16:24:08,035 INFO [Thread-99] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,035 INFO [Thread-34] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,035 INFO [Thread-68] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,037 INFO [Thread-30] (EmployeeService.java:77) - oldMoney: 131
2019-11-26 16:24:08,049 INFO [Thread-30] (EmployeeService.java:77) - oldMoney: 132
2019-11-26 16:24:08,068 INFO [Thread-3] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,068 INFO [Thread-10] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,068 INFO [Thread-73] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,068 INFO [Thread-1] (EmployeeService.java:65) - tryTimes: 1
2019-11-26 16:24:08,070 INFO [Thread-24] (EmployeeService.java:77) - oldMoney: 133
2019-11-26 16:24:08,082 INFO [Thread-69] (EmployeeService.java:77) - oldMoney: 134
2019-11-26 16:24:08,087 INFO [Thread-60] (EmployeeService.java:77) - oldMoney: 135
2019-11-26 16:24:08,117 INFO [Thread-38] (EmployeeService.java:77) - oldMoney: 136
2019-11-26 16:24:08,125 INFO [Thread-46] (EmployeeService.java:77) - oldMoney: 137
2019-11-26 16:24:08,131 INFO [Thread-30] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,132 INFO [Thread-72] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,149 INFO [Thread-11] (EmployeeService.java:77) - oldMoney: 138
2019-11-26 16:24:08,170 INFO [Thread-98] (EmployeeService.java:77) - oldMoney: 139
2019-11-26 16:24:08,180 INFO [Thread-60] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,181 INFO [Thread-46] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,180 INFO [Thread-69] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,180 INFO [Thread-38] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,180 INFO [Thread-24] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,188 INFO [Thread-71] (EmployeeService.java:77) - oldMoney: 140
2019-11-26 16:24:08,204 INFO [Thread-96] (EmployeeService.java:77) - oldMoney: 141
2019-11-26 16:24:08,210 INFO [Thread-11] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,210 INFO [Thread-98] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,230 INFO [Thread-91] (EmployeeService.java:77) - oldMoney: 142
2019-11-26 16:24:08,239 INFO [Thread-71] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,239 INFO [Thread-96] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,254 INFO [Thread-25] (EmployeeService.java:77) - oldMoney: 143
2019-11-26 16:24:08,254 INFO [Thread-58] (EmployeeService.java:77) - oldMoney: 143
2019-11-26 16:24:08,263 INFO [Thread-17] (EmployeeService.java:77) - oldMoney: 144
2019-11-26 16:24:08,268 INFO [Thread-91] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,275 INFO [Thread-63] (EmployeeService.java:77) - oldMoney: 145
2019-11-26 16:24:08,275 INFO [Thread-89] (EmployeeService.java:77) - oldMoney: 145
2019-11-26 16:24:08,277 INFO [Thread-51] (EmployeeService.java:77) - oldMoney: 146
2019-11-26 16:24:08,279 INFO [Thread-56] (EmployeeService.java:77) - oldMoney: 147
2019-11-26 16:24:08,280 INFO [Thread-40] (EmployeeService.java:77) - oldMoney: 147
2019-11-26 16:24:08,280 INFO [Thread-65] (EmployeeService.java:77) - oldMoney: 147
2019-11-26 16:24:08,287 INFO [Thread-100] (EmployeeService.java:77) - oldMoney: 148
2019-11-26 16:24:08,298 INFO [Thread-25] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,299 INFO [Thread-17] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,310 INFO [Thread-47] (EmployeeService.java:77) - oldMoney: 149
2019-11-26 16:24:08,319 INFO [Thread-6] (EmployeeService.java:77) - oldMoney: 150
2019-11-26 16:24:08,327 INFO [Thread-100] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,327 INFO [Thread-56] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,327 INFO [Thread-63] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,328 INFO [Thread-51] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,364 INFO [Thread-6] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,365 INFO [Thread-47] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,388 INFO [Thread-33] (EmployeeService.java:77) - oldMoney: 151
2019-11-26 16:24:08,400 INFO [Thread-58] (EmployeeService.java:77) - oldMoney: 152
2019-11-26 16:24:08,404 INFO [Thread-35] (EmployeeService.java:77) - oldMoney: 153
2019-11-26 16:24:08,424 INFO [Thread-89] (EmployeeService.java:77) - oldMoney: 154
2019-11-26 16:24:08,427 INFO [Thread-33] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,431 INFO [Thread-88] (EmployeeService.java:77) - oldMoney: 155
2019-11-26 16:24:08,453 INFO [Thread-12] (EmployeeService.java:77) - oldMoney: 156
2019-11-26 16:24:08,454 INFO [Thread-70] (EmployeeService.java:77) - oldMoney: 157
2019-11-26 16:24:08,457 INFO [Thread-89] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,457 INFO [Thread-58] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,458 INFO [Thread-35] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,459 INFO [Thread-54] (EmployeeService.java:77) - oldMoney: 158
2019-11-26 16:24:08,461 INFO [Thread-67] (EmployeeService.java:77) - oldMoney: 159
2019-11-26 16:24:08,470 INFO [Thread-31] (EmployeeService.java:77) - oldMoney: 160
2019-11-26 16:24:08,485 INFO [Thread-12] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,485 INFO [Thread-70] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,486 INFO [Thread-88] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,488 INFO [Thread-81] (EmployeeService.java:77) - oldMoney: 161
2019-11-26 16:24:08,497 INFO [Thread-23] (EmployeeService.java:77) - oldMoney: 162
2019-11-26 16:24:08,504 INFO [Thread-82] (EmployeeService.java:77) - oldMoney: 163
2019-11-26 16:24:08,507 INFO [Thread-50] (EmployeeService.java:77) - oldMoney: 164
2019-11-26 16:24:08,510 INFO [Thread-78] (EmployeeService.java:77) - oldMoney: 165
2019-11-26 16:24:08,514 INFO [Thread-67] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,514 INFO [Thread-54] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,516 INFO [Thread-97] (EmployeeService.java:77) - oldMoney: 166
2019-11-26 16:24:08,517 INFO [Thread-31] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,534 INFO [Thread-61] (EmployeeService.java:77) - oldMoney: 167
2019-11-26 16:24:08,538 INFO [Thread-29] (EmployeeService.java:77) - oldMoney: 168
2019-11-26 16:24:08,543 INFO [Thread-23] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,544 INFO [Thread-81] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,544 INFO [Thread-50] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,543 INFO [Thread-82] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,544 INFO [Thread-78] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,556 INFO [Thread-74] (EmployeeService.java:77) - oldMoney: 169
2019-11-26 16:24:08,572 INFO [Thread-61] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,573 INFO [Thread-29] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,572 INFO [Thread-97] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,582 INFO [Thread-80] (EmployeeService.java:77) - oldMoney: 170
2019-11-26 16:24:08,583 INFO [Thread-48] (EmployeeService.java:77) - oldMoney: 171
2019-11-26 16:24:08,584 INFO [Thread-27] (EmployeeService.java:77) - oldMoney: 172
2019-11-26 16:24:08,589 INFO [Thread-32] (EmployeeService.java:77) - oldMoney: 173
2019-11-26 16:24:08,602 INFO [Thread-74] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,608 INFO [Thread-85] (EmployeeService.java:77) - oldMoney: 174
2019-11-26 16:24:08,631 INFO [Thread-32] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,631 INFO [Thread-27] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:08,631 INFO [Thread-80] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,632 INFO [Thread-48] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,634 INFO [Thread-22] (EmployeeService.java:77) - oldMoney: 175
2019-11-26 16:24:08,660 INFO [Thread-85] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,689 INFO [Thread-22] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,696 INFO [Thread-44] (EmployeeService.java:77) - oldMoney: 176
2019-11-26 16:24:08,696 INFO [Thread-43] (EmployeeService.java:77) - oldMoney: 176
2019-11-26 16:24:08,704 INFO [Thread-13] (EmployeeService.java:77) - oldMoney: 177
2019-11-26 16:24:08,712 INFO [Thread-4] (EmployeeService.java:77) - oldMoney: 178
2019-11-26 16:24:08,722 INFO [Thread-45] (EmployeeService.java:77) - oldMoney: 179
2019-11-26 16:24:08,723 INFO [Thread-7] (EmployeeService.java:77) - oldMoney: 179
2019-11-26 16:24:08,727 INFO [Thread-44] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,743 INFO [Thread-77] (EmployeeService.java:77) - oldMoney: 180
2019-11-26 16:24:08,748 INFO [Thread-59] (EmployeeService.java:77) - oldMoney: 181
2019-11-26 16:24:08,754 INFO [Thread-57] (EmployeeService.java:77) - oldMoney: 182
2019-11-26 16:24:08,756 INFO [Thread-45] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,756 INFO [Thread-13] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,757 INFO [Thread-4] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,765 INFO [Thread-39] (EmployeeService.java:77) - oldMoney: 183
2019-11-26 16:24:08,779 INFO [Thread-66] (EmployeeService.java:77) - oldMoney: 184
2019-11-26 16:24:08,785 INFO [Thread-59] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,785 INFO [Thread-77] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,796 INFO [Thread-55] (EmployeeService.java:77) - oldMoney: 185
2019-11-26 16:24:08,811 INFO [Thread-62] (EmployeeService.java:77) - oldMoney: 186
2019-11-26 16:24:08,814 INFO [Thread-39] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,814 INFO [Thread-57] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,814 INFO [Thread-66] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,827 INFO [Thread-94] (EmployeeService.java:77) - oldMoney: 187
2019-11-26 16:24:08,840 INFO [Thread-53] (EmployeeService.java:77) - oldMoney: 188
2019-11-26 16:24:08,840 INFO [Thread-95] (EmployeeService.java:77) - oldMoney: 188
2019-11-26 16:24:08,843 INFO [Thread-62] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,843 INFO [Thread-55] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,857 INFO [Thread-37] (EmployeeService.java:77) - oldMoney: 189
2019-11-26 16:24:08,872 INFO [Thread-94] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,872 INFO [Thread-53] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,887 INFO [Thread-15] (EmployeeService.java:77) - oldMoney: 190
2019-11-26 16:24:08,891 INFO [Thread-16] (EmployeeService.java:77) - oldMoney: 191
2019-11-26 16:24:08,902 INFO [Thread-37] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,909 INFO [Thread-14] (EmployeeService.java:77) - oldMoney: 192
2019-11-26 16:24:08,931 INFO [Thread-16] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,931 INFO [Thread-15] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,960 INFO [Thread-14] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:08,964 INFO [Thread-65] (EmployeeService.java:77) - oldMoney: 193
2019-11-26 16:24:08,965 INFO [Thread-42] (EmployeeService.java:77) - oldMoney: 194
2019-11-26 16:24:08,970 INFO [Thread-19] (EmployeeService.java:77) - oldMoney: 195
2019-11-26 16:24:08,989 INFO [Thread-65] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:09,018 INFO [Thread-42] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:09,018 INFO [Thread-19] (EmployeeService.java:65) - tryTimes: 2
2019-11-26 16:24:09,025 INFO [Thread-40] (EmployeeService.java:77) - oldMoney: 196
2019-11-26 16:24:09,056 INFO [Thread-40] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:09,318 INFO [Thread-43] (EmployeeService.java:77) - oldMoney: 197
2019-11-26 16:24:09,352 INFO [Thread-43] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:09,433 INFO [Thread-7] (EmployeeService.java:77) - oldMoney: 198
2019-11-26 16:24:09,473 INFO [Thread-7] (EmployeeService.java:65) - tryTimes: 3
2019-11-26 16:24:09,578 INFO [Thread-95] (EmployeeService.java:77) - oldMoney: 199
2019-11-26 16:24:09,627 INFO [Thread-95] (EmployeeService.java:65) - tryTimes: 3
可以看到,还是有一些线程会拿到相同的值,但是由于版本控制使得最终只有一根线程能够更新成功,其它更新失败的线程会继续尝试,最终能更新成功。
悲观锁 | 乐观锁 | |
概念 | 查询时直接锁住记录使得其它事务不能查询,更不能更新 | 提交更新时检查版本或者时间戳是否符合 |
语法 | select ... for update | 使用 version 或者 timestamp 进行比较 |
实现者 | 数据库本身 | 开发者 |
适用场景 | 并发量大 | 并发量小 |
类比Java | Synchronized关键字 | CAS 算法 |