String keyspace_string = keyspace.toString();
AvroValidation.validateKey(keyspace_string);
AvroValidation.validateColumnPath(keyspace_string, cp);
RowMutation rm = new RowMutation(keyspace_string, key.toString());
try
{
rm.add(new QueryPath(column_family, super_column, column), value.array(), timestamp);
}
catch (MarshalException e)
{
throw newInvalidRequestException(e.getMessage());
}