I'm having problems with using the time_uuid type as a key in my columnfamily. I want to store my records, and have them ordered by when they were inserted, and then I figured that the time_uuid is a good way to go. This is how I've set up my column family:
sys.create_column_family("keyspace", "records", comparator_type=TIME_UUID_TYPE)
When I try to insert, I do this:
q=pycassa.ColumnFamily(pycassa.connect("keyspace"), "records")
myKey=pycassa.util.convert_time_to_uuid(datetime.datetime.utcnow())
q.insert(myKey,{'somedata':'comevalue'})
However, when I insert data, I always get an error:
Argument for a v1 UUID column name or value was neither a UUID, a datetime, or a number.
If I change the comparator_type to UTF8_TYPE, it works, but the order of the items when returned are not as they should be. What am I doing wrong?
The comparator for a column family is used for ordering the columns within each row. You are seeing that error because 'somedata' is valid utf-8 but not a valid uuid.
The ordering of the rows stored in cassandra is determined by the partitioner. Most likely you are using RandomPartitioner which distributes load evenly across your cluster but does not allow for meaningful range queries (the rows will be returned in a random order.)