MySQL Bugs: #86007: --pid-file did not define the parameters as we specified

Bug #86007	--pid-file did not define the parameters as we specified
Submitted:	19 Apr 2017 14:13	Modified:	20 Apr 2017 1:25
Reporter:	Lihong Cao	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server	Severity:	S3 (Non-critical)
Version:	5.7.16	OS:	Any (pid--file)
Assigned to:		CPU Architecture:	Any
Tags:	Pid-file

Description:
we specified the parameters  in the [mysqld] of the my.cnf like this
pid-file=/opt/mysql/data/mysql.pid ，but in fact, ps -ef  it is   --pid-file=/opt/mysql/data/localhost.pid ，i think it will depend on the hostname  and is not a good habit.
if in the future one day I modified the host name, it will give me an error，And its definition does not like the describe in the document  "--pid-file=file_name".
i think it's a little bug.we will be misunderstand easily.

How to repeat:
as we known ,we can modify the 258 line of the file which named mysqld(start mysqld ,we copy the file from $basedir/support-files/mysql.server)
modify "mysqld_pid_file_path=$datadir/`hostname`.pid" to "mysqld_pid_file_path=$datadir/pid" ,relieve dependency from the hostname.

but,don't known how to modify the correct definition as he specified the meaning.

Thanks!

Please try version 5.7.18. Thanks.

https://bugs.mysql.com/bug.php?id=84172

thinks a lot