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my2sql工具之快速入门

• 1.什么是my2sql
• 2.如何快速部署my2sql工具
• 3.如何使用my2sql工具
  • 3.1使用my2sql工具解析binglog文件
  • 3.2使用my2sql工具快速闪回
• 4.遇到的问题
• 5.使用限制
• 6.总结

1. 什么是my2sql？

my2sql是go版MySQL binlog解析工具，通过解析MySQL binlog ，可以生成原始SQL、回滚SQL、去除主键的INSERT SQL等，也可以生成DML统计信息。类似工具有binlog2sql、MyFlash、my2fback等，本工具基于my2fback、binlog_rollback工具二次开发而来。

2. 如何快速部署my2sql工具

方式一 go编译

git clone https://github.com/liuhr/my2sql.git
cd my2sql/
go build .

方式二 已编译好的二进制文件

二进制文件下载地址
https://github.com/liuhr/my2sql/blob/master/releases/centOS_release_7.x/my2sql

复制到我的docker中

#1、把my2sql 二进制文件复制到mysql8的容器中
 docker cp /usr/local/bin/my2sql  mysql8:/usr/local/bin

#2、进入容器
docker exec -it mysql8  bash
chmod +x /usr/local/bin/my2sql

3. 如何使用my2sql工具

3.1 使用my2sql工具解析binglog文件

step1：查询binglog文件

mysql> show variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW   |
+---------------+-------+
1 row in set (0.00 sec)

mysql> show master status;
+----------+----------+--------------+------------------+--------------------------------------------+
| File     | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                            |
+----------+----------+--------------+------------------+----------------------------------------------+
| 1.000001 |     1021 |              |                  | ecd66956-f106-11ec-bb85-0242ac110005:1-19718 |
+----------+----------+--------------+------------------+----------------------------------------------+
1 row in set (0.00 sec)

mysql> flush logs;
Query OK, 0 rows affected (0.71 sec)

mysql> show master status;
+----------+----------+--------------+------------------+----------------------------------------------+
| File     | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                            |
+----------+----------+--------------+------------------+----------------------------------------------+
| 1.000002 |      193 |              |                  | ecd66956-f106-11ec-bb85-0242ac110005:1-19718 |
+----------+----------+--------------+------------------+----------------------------------------------+
1 row in set (0.00 sec)

mysql> show variables like 'innodb_log_group_home_dir';
+---------------------------+-------+
| Variable_name             | Value |
+---------------------------+-------+
| innodb_log_group_home_dir | ./    |
+---------------------------+-------+
1 row in set (0.01 sec)

mysql> show variables like '%datadir%';
+---------------+-----------------+
| Variable_name | Value           |
+---------------+-----------------+
| datadir       | /var/lib/mysql/ |
+---------------+-----------------+
1 row in set (0.00 sec)

step2：查询测试表：

-- 查看测试表结构
mysql> show create table sbtest.sbtest1\G;
*************************** 1. row ***************************
       Table: sbtest1
Create Table: CREATE TABLE `sbtest1` (
  `id` int NOT NULL AUTO_INCREMENT,
  `k` int NOT NULL DEFAULT '0',
  `c` char(120) COLLATE utf8mb4_0900_bin NOT NULL DEFAULT '',
  `pad` char(60) COLLATE utf8mb4_0900_bin NOT NULL DEFAULT '',
  PRIMARY KEY (`id`),
  KEY `k_1` (`k`)
) ENGINE=InnoDB AUTO_INCREMENT=100001 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin
1 row in set (0.00 sec)

--查看测试表行数
mysql> select count(*) from sbtest.sbtest1;
+----------+
| count(*) |
+----------+
|   100000 |
+----------+
1 row in set (0.00 sec)

--查看测试表的检验值
mysql> checksum table sbtest.sbtest1;
+----------------+------------+
| Table          | Checksum   |
+----------------+------------+
| sbtest.sbtest1 | 4167997150 |
+----------------+------------+
1 row in set (0.09 sec)

-- 删除5万行数据
mysql> delete from sbtest.sbtest1 where id<50000; 【这里删除了49999行数据】
Query OK, 49999 rows affected (7.72 sec)

--再次看测试表的检验值
mysql> checksum table sbtest.sbtest1;
+----------------+------------+
| Table          | Checksum   |
+----------------+------------+
| sbtest.sbtest1 | 1629663751 |
+----------------+------------+
1 row in set (0.04 sec)

step3：解析binglog文件

#解析binglog文件
[email protected]:/tmp# my2sql  -user root -password ****** -host 127.0.0.1 -port 3306 -databases sbtest -tables sbtest1 -mode repl -work-type 2sql -start-file 1.000002 -output-dir /tmp
[2022/07/28 10:26:42] [info] binlogsyncer.go:144 create BinlogSyncer with config {1113306 mysql 127.0.0.1 3306 root   utf8 false false <nil> false UTC false 0 0s 0s 0 false false 0}
[2022/07/28 10:26:42] [info] events.go:60 start thread 1 to generate redo/rollback sql
[2022/07/28 10:26:42] [info] binlogsyncer.go:360 begin to sync binlog from position (1.000002, 4)
[2022/07/28 10:26:42] [info] stats_process.go:166 start thread to analyze statistics from binlog
[2022/07/28 10:26:42] [info] events.go:210 start thread to write redo/rollback sql into file
[2022/07/28 10:26:42] [info] events.go:60 start thread 2 to generate redo/rollback sql
[2022/07/28 10:26:42] [info] repl.go:16 start to get binlog from mysql
[2022/07/28 10:26:42] [info] binlogsyncer.go:777 rotate to (1.000002, 4)
[2022/07/28 10:26:50] [info] repl.go:84 deadline exceeded.
[2022/07/28 10:26:50] [info] repl.go:18 finish getting binlog from mysql
[2022/07/28 10:26:50] [info] stats_process.go:266 exit thread to analyze statistics from binlog
[2022/07/28 10:26:50] [info] events.go:185 exit thread 1 to generate redo/rollback sql
[2022/07/28 10:26:50] [info] events.go:185 exit thread 2 to generate redo/rollback sql
[2022/07/28 10:26:50] [info] events.go:274 finish writing redo/forward sql into file
[2022/07/28 10:26:50] [info] events.go:277 exit thread to write redo/rollback sql into file
[email protected]:/tmp# ls -lrt
total 2392
-rw-r--r-- 1 root root     261 Jul 28 10:26 biglong_trx.txt
-rw-r--r-- 1 root root 2438845 Jul 28 10:26 forward.2.sql
-rw-r--r-- 1 root root     288 Jul 28 10:26 binlog_status.txt 

step4：查看解析后的sql：

--文件binlog_status.txt和biglong_trx.txt是事务的统计信息
[email protected]:/tmp# cat binlog_status.txt 
binlog            starttime           stoptime            startpos   stoppos    inserts  updates  deletes  database        table               
1.000002          2022-07-28_10:24:06 2022-07-28_10:24:06 341        9536267    0        0        49999    sbtest          sbtest1             
[email protected]:/tmp# cat biglong_trx.txt
binlog            starttime           stoptime            startpos   stoppos    rows     duration   tables
1.000002          2022-07-28_10:24:06 2022-07-28_10:24:06 269        9536294    49999    0          [sbtest.sbtest1(inserts=0, updates=0, deletes=49999)]

--文件forward.2.sql是binlog解析之后的sql
[email protected]:/tmp#  more -10 forward.2.sql 
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=1;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=2;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=3;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=4;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=5;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=6;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=7;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=8;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=9;
DELETE FROM `sbtest`.`sbtest1` WHERE `id`=10;
--More--(0%)

3.2 使用my2sql工具快速闪回

step1：生成闪回sql文件

[email protected]:/tmp# my2sql  -user root -password ****** -host 127.0.0.1 -port 3306 -databases sbtest -tables sbtest1 -mode repl -work-type rollback   -start-file 1.000002  -output-dir /tmp/flashback/
[2022/07/28 10:42:55] [info] events.go:60 start thread 1 to generate redo/rollback sql
[2022/07/28 10:42:55] [info] events.go:210 start thread to write redo/rollback sql into file
[2022/07/28 10:42:55] [info] binlogsyncer.go:144 create BinlogSyncer with config {1113306 mysql 127.0.0.1 3306 root   utf8 false false <nil> false UTC false 0 0s 0s 0 false false 0}
[2022/07/28 10:42:55] [info] events.go:60 start thread 2 to generate redo/rollback sql
[2022/07/28 10:42:55] [info] stats_process.go:166 start thread to analyze statistics from binlog
[2022/07/28 10:42:55] [info] binlogsyncer.go:360 begin to sync binlog from position (1.000002, 4)
[2022/07/28 10:42:55] [info] repl.go:16 start to get binlog from mysql
[2022/07/28 10:42:55] [info] binlogsyncer.go:777 rotate to (1.000002, 4)
[2022/07/28 10:43:00] [info] repl.go:84 deadline exceeded.
[2022/07/28 10:43:00] [info] repl.go:18 finish getting binlog from mysql
[2022/07/28 10:43:00] [info] stats_process.go:266 exit thread to analyze statistics from binlog
[2022/07/28 10:43:00] [info] events.go:185 exit thread 1 to generate redo/rollback sql
[2022/07/28 10:43:00] [info] events.go:185 exit thread 2 to generate redo/rollback sql
[2022/07/28 10:43:00] [info] events.go:259 finish writing rollback sql into tmp files, start to revert content order of tmp files
[2022/07/28 10:43:00] [info] rollback_process.go:15 start thread 1 to revert rollback sql files
[2022/07/28 10:43:00] [info] rollback_process.go:41 start to revert tmp file /tmp/flashback/.rollback.2.sql into /tmp/flashback/rollback.2.sql
[2022/07/28 10:43:00] [info] rollback_process.go:156 finish reverting tmp file /tmp/flashback/.rollback.2.sql into /tmp/flashback/rollback.2.sql
[2022/07/28 10:43:00] [info] rollback_process.go:25 exit thread 1 to revert rollback sql files
[2022/07/28 10:43:00] [info] events.go:272 finish reverting content order of tmp files
[2022/07/28 10:43:00] [info] events.go:277 exit thread to write redo/rollback sql into file

step2：查看生成的闪回文件：

[email protected]:/tmp/flashback# ls -lrt
total 12596
-rw-r--r-- 1 root root      261 Jul 28 10:42 biglong_trx.txt
-rw-r--r-- 1 root root      288 Jul 28 10:43 binlog_status.txt
-rw-r--r-- 1 root root 12888636 Jul 28 10:43 rollback.2.sql

[email protected]:/tmp/flashback# cat  biglong_trx.txt
binlog            starttime           stoptime            startpos   stoppos    rows     duration   tables
1.000002          2022-07-28_10:24:06 2022-07-28_10:24:06 269        9536294    49999    0          [sbtest.sbtest1(inserts=0, updates=0, deletes=49999)]

[email protected]:/tmp/flashback# cat binlog_status.txt
binlog            starttime           stoptime            startpos   stoppos    inserts  updates  deletes  database        table               
1.000002          2022-07-28_10:24:06 2022-07-28_10:24:06 341        9536267    0        0        49999    sbtest          sbtest1           

[email protected]:/tmp/flashback# more -10 rollback.2.sql
INSERT INTO `sbtest`.`sbtest1` (`id`,`k`,`c`,`pad`) VALUES (49999,33022,'82276829554-28600016482-71437056503-67189283057-49828408020-97469013057-54486869404-00631592142
-97314346455-10619483378','14496218158-82953408254-72982060504-31493955809-57788873512');
INSERT INTO `sbtest`.`sbtest1` (`id`,`k`,`c`,`pad`) VALUES (49998,50244,'96937339387-30971064351-79066739653-24906328840-02614118448-07131634761-96921531810-30574594369
-22852947139-53163560618','11061918782-99235282357-54725926348-09882016546-43656283296');
INSERT INTO `sbtest`.`sbtest1` (`id`,`k`,`c`,`pad`) VALUES (49997,49958,'23875561992-79383179714-31844019265-78678195929-11039506986-44432953782-19018620372-45679869851
-21838821757-54316746647','72021998255-21544610411-49097617755-83325624702-67496909817');
INSERT INTO `sbtest`.`sbtest1` (`id`,`k`,`c`,`pad`) VALUES (49996,49784,'64121185719-74243968401-44193775190-53796401184-56297492349-79981936074-03057285270-03714583251
-22209198873-10937378934','77159337465-83656217977-70877234699-71552982384-42185635425');
INSERT INTO `sbtest`.`sbtest1` (`id`,`k`,`c`,`pad`) VALUES (49995,49750,'32364537835-96169411677-52025383891-99856461851-54876781624-38035712955-18254695168-34412213489
-24174915574-41228645716','40846762001-49118260546-21871620253-63339659850-56585169893');
--More--(0%)

step3：应用rollback文件进行数据恢复

mysql -uroot -p****** -P3306 -h127.0.0.1 sbtest < /tmp/flashback/rollback.2.sql

step4：最后检查恢复情况

mysql> select count(*) from sbtest.sbtest1;
+----------+
| count(*) |
+----------+
|   100000 |
+----------+
1 row in set (0.01 sec)

mysql> checksum table sbtest.sbtest1;
+----------------+------------+
| Table          | Checksum   |
+----------------+------------+
| sbtest.sbtest1 | 4167997150 |
+----------------+------------+
1 row in set (0.08 sec)

4. 遇到的问题

问题1：Connect mysql failed this authentication plugin is not supported

my2sql  -user greatsql -password ****** -host 127.0.0.1 -port 3306  -mode repl -work-type 2sql -start-file binlog.000001
[2022/07/28 10:00:01] [fatal] context.go:575 Connect mysql failed this authentication plugin is not supported

解决

#修改
ALTER USER 'username'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
FLUSH PRIVILEGES;

问题2：Connect mysql failed this user requires mysql native password authentication.

my2sql  -user greatsql  -password ****** 127.0.0.1 -port 3306 -mode repl -work-type 2sql -start-file binlog.000001
[2022/07/28 09:35:08] [fatal] context.go:575 Connect mysql failed this user requires mysql native password authentication.

解决

#mysql配置文件中增加以下配置项并重启
default_authentication_plugin=mysql_native_password

5. 使用限制

• 使用回滚/闪回功能时，binlog格式必须为row,且binlog_row_image=full， DML统计以及大事务分析不受影响。
• 只能回滚DML， 不能回滚DDL。
• 支持指定-tl时区来解释binlog中time/datetime字段的内容。开始时间-start-datetime与结束时间-stop-datetime也会使用此指定的时区， 但注意此开始与结束时间针对的是binlog event header中保存的unix timestamp。结果中的额外的datetime时间信息都是binlog event header中的unix timestamp。
• 此工具是伪装成从库拉取binlog，需要连接数据库的用户有SELECT, REPLICATION SLAVE, REPLICATION CLIENT权限。
• MySQL8.0版本需要在配置文件中加入default_authentication_plugin =mysql_native_password，用户密码认证必须是mysql_native_password才能解析。

6.总结

my2sql除了可以用来做binlog的解析、闪回，还提供主从切换后新master丢数据的修复、大事务和长事务的分析、主从延迟分析等，后面有空继续分享my2sql在事务方面的应用，大家也可以自己动手实践一下。

参考文档

https://github.com/liuhr/my2sql/blob/master/README.md

Enjoy GreatSQL