MYSQL 8.0 - unsupported redo log format - php

Question

I have recently updated mysql that was located under my xampp folder, and i've got the following errors, reporting from the log file :
2018-04-19T12:59:19.667059Z 0 [System] [MY-010116] [Server] C:\xampp\mysql\bin\mysqld.exe (mysqld 8.0.11) starting as process 9324
2018-04-19T12:59:20.025280Z 1 [ERROR] [MY-013090] [InnoDB] InnoDB: Unsupported redo log format (0). The redo log was created before MySQL 5.7.9
2018-04-19T12:59:20.026140Z 1 [ERROR] [MY-012930] [InnoDB] InnoDB: Plugin initialization aborted with error Generic error.
2018-04-19T12:59:20.229069Z 1 [ERROR] [MY-011013] [Server] Failed to initialize DD Storage Engine.
2018-04-19T12:59:20.230803Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2018-04-19T12:59:20.231371Z 0 [ERROR] [MY-010119] [Server] Aborting
2018-04-19T12:59:20.233136Z 0 [System] [MY-010910] [Server] C:\xampp\mysql\bin\mysqld.exe: Shutdown complete (mysqld 8.0.11) MySQL Community Server - GPL.
I have been told if updating your mysql, you should comment out the deprecated configs that are located in your my.ini, but i had no idea what to comment out, so i left it as it is.
Any idea what causes this?

Answer 1

If you have already installed MySQL and did not perform a slow shutdown using the
innodb_fast_shutdown
Flag, simply go to your MySQL directory
/var/lib/mysql/
And remove the log files (Do not do this if you need the table data in your database until you have backed up your database):
ib_logfile0
ib_logfile1
Back them up before if you need them again.

Answer 2

Docker users
I faced with the same error while using dockerized mariaDB.
The solution was:
remove the docker image:
docker image ls
docker rmi imagename
remove the volume:
docker volume ls
docker volume rm yourvolume
remove the container:
docker ps -a
docker rm yourcontainer
Then:
docker-compose up
Windows 10 Users
Also in windows if you want to remove the log files as it was suggested earlier:
The ib_logfiles are in
C:\ProgramData\MySQL\MySQL Server x.x\Data

Answer 3

Mac OS X Users
The ib_logfiles are here
rm /usr/local/var/mysql/ib_logfile*

Answer 4

In my case, I have deleted the complete folder /var/lib/mysql and restarted the mysql service and it worked...
rm -rf /var/lib/mysql
Note: You may loose your data if you delete that folder