Oh, I just realized that you're asking about the lowest TimeUUID *overall*, not just for a particular timestamp. Sorry.
The lowest possible TimeUUID is '00000000-0000-1000-8080-808080808080'. The highest is 'ffffffff-ffff-1fff-bf7f-7f7f7f7f7f7f'. On Tue, Apr 24, 2012 at 12:47 PM, Drew Kutcharian <d...@venarc.com> wrote: > Thanks. So looking at the code, to get the lowest possible TimeUUID value > using your function I should just call convert_time_to_uuid(0) ? > > > On Apr 24, 2012, at 10:15 AM, Tyler Hobbs wrote: > > Yes, I have tested it. > > On Tue, Apr 24, 2012 at 12:08 PM, Drew Kutcharian <d...@venarc.com> wrote: > >> Thanks Tyler. So have you actually tried this with Cassandra? >> >> >> >> On Apr 24, 2012, at 5:44 AM, Tyler Hobbs wrote: >> >> At least for TimeUUIDs, this email I sent to client-dev@ a couple of >> weeks ago should help to explain things: >> http://www.mail-archive.com/client-dev@cassandra.apache.org/msg00125.html >> >> Looking at the linked pycassa code might be the most useful thing. >> >> On Tue, Apr 24, 2012 at 1:46 AM, Drew Kutcharian <d...@venarc.com> wrote: >> >>> Hi All, >>> >>> Considering that UUIDs are compared as numbers in Java [1], what are the >>> lowest and highest possible values a valid UUID can have? How about >>> TimeUUIDs? >>> >>> The reason I ask is that I would like to pick a "default" UUID value in >>> a composite column definition like Composite(UUID1, UUID2) where UUID1 can >>> be set to the default value if not supplied. In addition, it'd be nice if >>> the "default" columns are always sorted before the rest of the columns. >>> >>> I was thinking of just doing "new UUID(Long.MAX_VALUE, Long.MAX_VALUE)" >>> or "new UUID(Long.MIN_VALUE, Long.MIN_VALUE)" but not sure if that's going >>> to cause other issues that I'm not aware of. >>> >>> Thanks, >>> >>> Drew >>> >>> >>> [1] Here's the compareTo of java.util.UUID as a reference: >>> >>> public int compareTo(UUID val) { >>> // The ordering is intentionally set up so that the UUIDs >>> // can simply be numerically compared as two numbers >>> return (this.mostSigBits < val.mostSigBits ? -1 : >>> (this.mostSigBits > val.mostSigBits ? 1 : >>> (this.leastSigBits < val.leastSigBits ? -1 : >>> (this.leastSigBits > val.leastSigBits ? 1 : >>> 0)))); >>> } >>> >>> >> >> >> -- >> Tyler Hobbs >> DataStax <http://datastax.com/> >> >> >> > > > -- > Tyler Hobbs > DataStax <http://datastax.com/> > > > -- Tyler Hobbs DataStax <http://datastax.com/>
