MySQL mysqlbinlog 访问mysql-bin日志出错

问题

mysqlbinlog -v -v --base64-output=decode-rows mysql-bin.000166 | less

error: error in log_event::read_log_event(): 'found invalid event in binary log', data_len: 111, event_type: 35
/*!50530 set @@session.pseudo_slave_mode=1*/;
/*!40019 set @@session.max_insert_delayed_threads=0*/;


/*!50003 set @old_completion_type=@@completion_type,completion_type=0*/;
delimiter /*!*/;
# at 4
#190408 18:15:19 server id 311948559  end_log_pos 123 crc32 0x56e12e5d  start: binlog v 4, server v 5.7.21-log created 190408 18:15:19
# warning: this binlog is either in use or was not closed properly.
binlog '
nx+rxa8p9zcsdwaaahsaaaabaaqans43ljixlwxvzwaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaezgnaagaegaebaqeegaaxwaegggaaaaicagcaaaacgokkioaejqa
av0u4vy=
'/*!*/;
delimiter ;
# end of log file
rollback /* added by mysqlbinlog */;
/*!50003 set completion_type=@old_completion_type*/;
/*!50530 set @@session.pseudo_slave_mode=0*/;

查看当前使用的mysqlbinlog文件位置

which mysqlbinlog
/usr/bin/mysqlbinlog

ll /usr/bin/mysqlbinlog
-rwxr-xr-x 1 root root 3259000 6月 10 2014 /usr/bin/mysqlbinlog
该myqlbinlog在2014年就已经存在了，推测是该机器中自带的mariadb中的

版本信息

/usr/bin/mysqlbinlog --version
/usr/bin/mysqlbinlog ver 3.3 for linux at x86_64
/usr/bin/mysqlbinlog ver 3.3 for linux at x86_64
copyright (c) 2000, 2013, oracle, monty program ab and others.

dumps a mysql binary log in a format usable for viewing or for piping to
the mysql command line client.

查看当前运行的mysqld进程basedir

ps -ef | grep defaults | grep 3308 | awk '{print $8}'
/opt/mysql/base/5.7.21/bin/mysqld

版本信息

/opt/mysql/base/5.7.21/bin/mysqlbinlog -v
/opt/mysql/base/5.7.21/bin/mysqlbinlog ver 3.4 for linux-glibc2.12 at x86_64

删除原可执行文件mysqlbinlog，重新建立软链接

rm -r /usr/bin/mysqlbinlog
rm：是否删除普通文件 "/usr/bin/mysqlbinlog"？y

ln -s /opt/mysql/base/5.7.21/bin/mysqlbinlog /usr/bin

可正常使用

mysqlbinlog -v -v --base64-output=decode-rows mysql-bin.000166 | less

/*!50530 set @@session.pseudo_slave_mode=1*/;
/*!50003 set @old_completion_type=@@completion_type,completion_type=0*/;
delimiter /*!*/;
# at 4
#190408 18:15:19 server id 311948559  end_log_pos 123 crc32 0x56e12e5d  start: binlog v 4, server v 5.7.21-log created 190408 18:15:19
# warning: this binlog is either in use or was not closed properly.
# at 123

老版本mysql可执行文件却能正常运行

ll /usr/bin/mysql
-rwxr-xr-x 1 root root 3546584 6月 10 2014 /usr/bin/mysql

mysql --version
mysql ver 15.1 distrib 5.5.35-mariadb, for linux (x86_64) using readline 5.1

/opt/mysql/base/5.7.21/bin/mysql -uroot -p --socket=/datas/mysql/data/3308/mysqld.sock -e"select version()"
enter password:
+------------+
| version() |
+------------+
| 5.7.21-log |
+------------+

结论

• 出现 error: error in log_event::read_log_event(): 'found invalid event in binary log', data_len: 111, event_type: 35 错误是由于当前使用的myqlbinlog可执行文件的版本和正在运行的mysqld进程basedir中mysqlbinlog的版本不一致导致的（版本低不能正常读取高版本的mysqld产生的mysql-bin文件，产生的mysql-bin文件有event老版本的myqlbinlog不能正常读取）

• 低版本的mysql可执行文件能正常登陆高版本的mysqld