You can't specify that sort of custom type as part of the schema; instead, use BytesType and tell pycassa to interpret those columns as your custom type through the 'column_validators' attribute on your ColumnFamily object.
For example: mycf = ColumnFamily(...) mycf.column_validators["email_addresses"] = MyListType() Basically, pycassa will call your pack() function when inserting that column and your unpack() function when reading that column. On Sat, Aug 10, 2013 at 9:20 AM, Vladimir Prudnikov <v.prudni...@gmail.com>wrote: > Hi all, > I use pycassa and I want to store lists and tuples in cassandra by > serializing them using MessagePack. Seems like custom data type is what I > need. Here is data type I created: > ########################################## > class MyListType(CassandraType): > @staticmethod > def pack(value): > return msgpack.packb(value) > > @staticmethod > def unpack(value): > return msgpack.unpackb(value) > ########################################## > Now I'm creating a new column family and use instance of this class in > column_validation_classes but unsuccessful. It raises > "InvalidRequestException: InvalidRequestException(why="Unable to find > abstract-type class 'org.apache.cassandra.db.marshal.MyListType'")". > > What I'm doing wrong? How to do it properly? > Thanks. > -- > Vladimir Prudnikov > -- Tyler Hobbs DataStax <http://datastax.com/>
