title: Cassandra CLI 'org.apache.thrift.transport.TTransportException'
body: <p>I'm on the latest version of Cassandra 1.1.2 and already have data in my Cassandra db. I want to update the meta data of a column family through:</p>
  
  <p>update column family Comment with column_metadata =  [{column_name: timestamp, validation_class: UTF8Type}];</p>
  
  <p>(prior, timestamp was of IntegerType)</p>
  
  <p>However, Cassandra-CLI returns:
  'org.apache.thrift.transport.TTransportException'</p>
  
  <p>When I try the command again, I get:
  'org.apache.thrift.transport.TTransportException: java.net.SocketException: Broken pipe'</p>
  
  <p>I'm running Cassandra on Ubuntu.</p>