title: MySQL fails to start with myisam_repair_threads variable not found
body: <p>I'm troubleshooting a MySQL 14.14** instance that is failing to start on Ubuntu 18.04.</p>
  <p>Upon starting the service, MySQL is exiting with <code>unknown variable 'myisam_repair_threads=1'</code></p>
  <p>I've run <code>myisamchk</code> and confirmed that I do not see the variable listed. I also don't see the variable set in the systemd file for mysql. I'm not sure how to begin to troubleshoot.</p>
  <p><strong>Edit</strong></p>
  <p>** Per Bill Karwin's response below, this is the client version. The version of the MySQL server instance in question is incompatible with this variable. Commenting out the config where this value was set and restarting resolved the issue.</p>