title: What are allowable values for allocate_tokens_for_keyspace in cassandra.yaml?
body: <p>Cassandra 3.0 added a new option to optimize the load across nodes, <code>allocate_tokens_for_keyspace</code>, in cassandra.yaml with default value <code>KEYSPACE</code>.</p>
  
  <ul>
  <li>Does a specific keyspace need to be provided?  </li>
  <li>What does the default value <code>KEYSPACE</code> do?</li>
  <li>If it needs to be specific, how do I specify multiple keyspaces for a
  node?</li>
  </ul>
  
  <p>Experimenting with different values I have been able to put random strings and comma separated lists in when adding a node and the new node joins the cluster but there are no useful messages in the debug log saying whether the value is valid or not. I have searched but found no documentation explaining allowable values for <code>allocate_tokens_for_keyspace</code>. </p>