I stopped mysqld by killing the process id, and then deleted mysqld.sock file also.
Now, mysqld is not starting.
I know there is some data corruption. But now I need to start MySQL without re-installing it.
Below are the logs that generated.
InnoDB: using the same InnoDB data or log files.
InnoDB: Unable to lock ./ibdata1, error: 11
InnoDB: Check that you do not already have another mysqld process
InnoDB: using the same InnoDB data or log files.
140107 8:27:43 InnoDB: Unable to open the first data file
InnoDB: Error in opening ./ibdata1
140107 8:27:43 InnoDB: Operating system error number 11 in a file operation.
InnoDB: Error number 11 means 'Resource temporarily unavailable'.
InnoDB: Some operating system error numbers are described at
InnoDB: http://dev.mysql.com/doc/refman/5.1/en/operating-system-error-codes.html
InnoDB: Could not open or create data files.
InnoDB: If you tried to add new data files, and it failed here,
InnoDB: you should now edit innodb_data_file_path in my.cnf back
InnoDB: to what it was, and remove the new ibdata files InnoDB created
InnoDB: in this failed attempt. InnoDB only wrote those files full of
InnoDB: zeros, but did not yet use them in any way. But be careful: do not
InnoDB: remove old data files which contain your precious data!
140107 8:27:43 [ERROR] Plugin 'InnoDB' init function returned error.
140107 8:27:43 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140107 8:27:43 [ERROR] /usr/libexec/mysqld: unknown option '--ndbcluster'
140107 8:27:43 [ERROR] Aborting
140107 8:27:43 [Note] /usr/libexec/mysqld: Shutdown complete
140107 08:27:43 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
解決方案
You need to restore the innodb data files.
# cd /var/lib/mysql
# mkdir bak
# mv ibdata1 bak/
# mv ib_logfile* bak/
# cp -a bak/ibdata1 ibdata1
# cp -a bak/ib_logfile* .
# rm -rf bak
# service mysqld restart