title: ERROR 3098 (HY000): The table does not comply with the requirements by an external plugin
body: <p><strong>SETUP:</strong></p>
  
  <ul>
  <li>Three mysql group replication nodes in master master master.</li>
  <li>All work fine. I can add users/dbs and insert/update data.</li>
  <li>Each node is bound to a private IP address.</li>
  <li>I created a bash script to connect to mysql to delete users.</li>
  <li>Deleting a database with a script works fine.</li>
  </ul>
  
  <p><strong>PROBLEM:</strong> </p>
  
  <p>The following commands will NOT run. I can create users and databases and delete databases but cant delete the users. I cant tell if its a replication issue OR a privilege issue.</p>
  
  <ul>
  <li>DELETE FROM mysql.user WHERE user='testme123';</li>
  <li>DELETE FROM mysql.db   WHERE user='testme123';</li>
  <li>DROP USER IF EXISTS 'testme123';</li>
  </ul>
  
  <p>ERROR 3098 (HY000) at line 1: The table does not comply with the requirements by an external plugin.</p>
  
  <p>LOG: [ERROR] Plugin group_replication reported: 'Table user does not use the InnoDB storage engine. This is not compatible with Group Replication.</p>
  
  <p>I get same error via local mysql console too logged in as root.</p>
  
  <p><strong>QUESTION(S):</strong></p>
  
  <ul>
  <li>What could be preventing this?</li>
  <li>How can I troubleshoot what it is I am missing?</li>
  </ul>