title: Cassandra Super Column Family Schema Creation
body: <p>I am trying to create a Super Column Family that will replicate a structure like this.</p>
  
  <pre><code>{ 'hd':
      '2008/12/12 10:03': { metric1: 'blah', metric2: 'blah'}
      '2008/12/2 9:03': { metric1: 'blah', metric2: 'blah'}
     'cpu':
      '2008/12/12 10:03': { metric1: 'blah', metric2: 'blah'}
      '2008/12/2 9:03': { metric1: 'blah', metric2: 'blah'}
  }
  </code></pre>
  
  <p>My current try looks like this:</p>
  
  <pre><code>create column family Timestep
  with column_type = 'Super'
  and comparator = 'AsciiType'
  and subcomparator = 'DateType'
  and default_validation_class = 'DoubleType'
  and key_validation_class = 'AsciiType'
  and column_metadata = [
      {column_name : metric1, validation_class : DoubleType}
      {column_name : metric2, validation_class : DoubleType}
  ];
  </code></pre>
  
  <p>But if I try and run the above in the cassandra-cli:</p>
  
  <pre><code>java.lang.RuntimeException: org.apache.cassandra.db.marshal.MarshalException: unable to coerce 'open' to a  formatted date (long)
  </code></pre>
  
  <p>Maybe I am not understanding what a super column family is properly, but any help would be awesome.</p>
  
  <p>Thanks.</p>