Sylvain Lebresne created CASSANDRA-4194:
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Summary: CQL3: improve experience with time uuid
Key: CASSANDRA-4194
URL: https://issues.apache.org/jira/browse/CASSANDRA-4194
Project: Cassandra
Issue Type: Improvement
Components: API
Reporter: Sylvain Lebresne
Assignee: Sylvain Lebresne
Priority: Minor
Fix For: 1.1.1
This ticket proposes to add a timeuuid type to CQL3. I know that the uuid type
does support version 1 UUID (which is fine), but my rational is that time
series is a very common use case for Cassandra. But when modeling time series,
it seems to me that you'd almost always want to use time uuids rather than
timestamps to avoid having to care about collision. In those case, using a
timeuuid type would imo have the following advantages over simply uuid:
# the type convey the idea that this is really a date (but need to avoid
collision). In other words, the 'time' in timeuuid has a documentation purpose.
# it validates that you do only insert a UUID v1. Inserting non-time based UUID
when you really care about the time ordering is a important mistake, it's nice
to validate this doesn't happen (it's one of the goal of the type after all)
# it'll allow to parse date values (which TimeUUIDType already does). Since
timeuuid is really a date, it's useful and convenient to allow '2012-04-27
11:32:02' as a value.
I'll note that imho there really is no reason not to at least allow 3) and even
if there is strong opposition to adding a new timeuuid type (though I don't see
why that would be a big deal) we could add the parsing of date to uuid. But I
do think personally that 1) and 2) are equally important and warrant the
addition of timeuuid (and it'll feel less random to parse date as timeuuid than
to do it for uuid).
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