I would like to store some timestamped user info in a Column Family with the usernames as the row key and different timestamps as column names. Each user might have a thousand timestamped data.
I understand that the ver 1 UUIDs that Cassandra combines the MAC address of the computer generating the UUID with the number of 100-nanosecond intervals since the beginning of the Gregorian calendar. So, if user1 had data stored for an event at Jan 30, 2011/2:15pm and user2 had an event at the exact same time, the data could potentially be stored in different column names? So, I would have to know the MAC of the generating computer in order to do a column slice, right? When does it make sense to use TimeUUID vs just a time string like 20110130141500 and comparator type UTF8? - Sameer
