How long does it take for "service mysql start" to start mysql?

Question

I ran a service mysql stop and followed it with a service mysql start, however, this process has been going for about 2 hours now and I don't know if it's a bad idea to kill the process. Any ideas?

Thanks.

Solution

I had to write answer cause I do not have enough reputation to make a comment.

I was dealing with the same problem. MySQL version 5.7.9. I was working on some configuration settings and I realized that some configurations somehow preventing MySQL server start. It just keeps trying to start server giving no error. These are the config that I was trying to configure from the URL https://dba.stackexchange.com/a/41873:

innodb_buffer_pool_size=4G
innodb_buffer_pool_instance=2
innodb_read_io_threads=12
innodb_write_io_threads=12
innodb_io_capacity=300
innodb_log_file_size=128M

Disclaimer: I wrote that answer just because I think It may useful for someone but also I am angry at the OP. He/she probably solved the problem somehow (reinstall also is an answer) but did not write it down.