WARNING: --master-data is deprecated and will be removed in a future version

Mysql 版本：/usr/local/mysql/bin/mysql Ver 8.0.26 for Linux on x86_64 (MySQL Community Server - GPL)

报错：mysqldump全库备份后，导入时报错

ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WARNING: --master-data is deprecated and will be removed in a future version. Us' at line 1

操作过程：

mysqldump全库备份，操作命令如下：

mysqldump -uroot -p****** --single-transaction --master-data=2 --routines --flush-logs --flush-privileges --all-databases --set-gtid-purged=OFF > fulldb_20220223.sql

后续导入新库报错：

mysql -uroot -p < fulldb_20220223.sql

查看导出的文件头部：

# head -10 fulldb_20220223.sql
WARNING: --master-data is deprecated and will be removed in a future version. Use --source-data instead.
-- MySQL dump 10.13 Distrib 8.0.26, for Linux (x86_64)
--
-- Host: localhost Database:
-- ------------------------------------------------------
-- Server version 8.0.26

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;

导出的sql文件里多了一行Waring，提示master-data将废弃，建议使用source-data。

原因分析：

该情况属于Bug。Mysqldump 8.0.26新版本引入新参数，有waring提示正常，但错误信息本不该直接写到sql文件里的。MySQL Bugs: #104769: CLI options deprecation warnings of mysqldump are printed to stdout

解决方法：

方法一：

导出时就不使用master-data，改为source-data替代。这属于新版本8.0.26 mysqldump 的改变，新引入的参数。

方法二：

原本已经导出好文件，没必要浪费时间重新导出，直接注释掉或者删掉这一行Waring即可。

删除文件里第一行（Linux环境）：

sed -i '1d' fulldb_20220223.sql

参考文档

A message "WARNING: --master-data is deprecated ..." is logged in the redirected file by mysqldump (Doc ID 2807795.1) To BottomTo Bottom
MySQL Bugs: #104769: CLI options deprecation warnings of mysqldump are printed to stdout

MySQL :: MySQL 8.0 Reference Manual :: 4.5.4 mysqldump — A Database Backup Program

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