Thanks, Tatu! I'm going ahead with it. Now if something goes wrong I'll say: "But Tatu said..." (just kidding).
I've replaced Random in the code above with SecureRandom, for that extra dose of randomness (my biggest worry was that Random self-seeds with System.currentTimeMillis(), and there is some infinitesimal chance that two servers could start up in the same clock tick). Any thoughts? On Thu, Jun 24, 2010 at 8:31 PM, Tatu Saloranta <tsalora...@gmail.com>wrote: > On Wed, Jun 23, 2010 at 12:18 AM, David Boxenhorn <da...@lookin2.com> > wrote: > > Tatu, I did read your comments - and I appreciate them very much! > > > > I want someone to argue with me (using good arguments) since what I'm > doing > > *does* seem weird to me - because no one else is doing it. > > > > What I mean by readable is that the sort order of my UUIDs are obvious to > > humans. > > > > What I mean by "weird code" is mostly that it doesn't come with enough > > authority that I would trust it as a black-box more than my own code. For > > example, what happens when I want to port it to different kinds of > machines? > > Ok! It all makes sense -- honestly I just wanted to try to explain why > certain consensus builds, not to argue against your way of doing > things. > I don't think you are missing anything obvious, my suggestions are > really secondary arguments. I think you have good reasons and code > looked solid. > > And yes, implementing time-based UUIDs leads to quite a few > complications, if one tries to address all oddities. > This is probably why JDK UUID is so limiting, I assume JDK authors did > not want to deal with such aspects. > And that is why I think that fundamentally random-based variant is > good for the main goal of achieving uniqueness. > > > But another thing weird about it is the complexity (and I think low > speed) > > of the algorithms I need in my *own* code to use it. Just look at it > > http://wiki.apache.org/cassandra/FAQ#working_with_timeuuid_in_java ! > > Yes, that is definitely overly complicated (IMO). Perhaps Cassandra > could add convenience methods for mundane things like converting > between java.util.UUID and byte[]. > Or authors of nice extension/convenience libraries like Hector (and > others mentioned -- apologies for not listing I just worry I misspell > their names :) ) > > -+ Tatu +- >
