Hi Max, That's a interesting library thanks.
Does the library guarantee monotonically increasing IDs? Eg protection against clock reset and other clock fluctuations? Another thing I've noticed is that you are using (System/currentTimeMillis) to get the wall clock on every generation. (System/currentTimeMillis) causes a low level system call which in turn causes a context switch. Maybe one way to improve could be use a initial (System/currentTimeMillis) on the first init! and then use System/nanoTime to calculate the time elapsed from the init. The advantage would be that System/nanoTime runs in the UserSpace (not Kernel Space) and it doesn't require a system call (so no context switch). This could really help the case of a bulk production of IDs and any other burst situation. Bruno On Friday, June 3, 2016 at 4:40:26 PM UTC+1, Max Countryman wrote: > > Hi Mark, > > I haven’t done any benchmarking comparing Flakes to UUIDs. However the > primary benefit of flake IDs, over a traditional UUID, e.g. UUID-1, is > flakes do not require coordination (i.e. to avoid clock-skew and duplicate > IDs), provide k-ordering (UUID-1’s bit ordering breaks this), and use the > standard Unix epoch. It would be interesting to compare performance, but > the features of flakes are certainly their primary selling points. > > > Max > > On Jun 2, 2016, at 20:38, Mark Engelberg <mark.en...@gmail.com > <javascript:>> wrote: > > This is interesting. Is it faster than uuid for generation and/or > comparing for equality? > > On Thu, Jun 2, 2016 at 6:03 PM, Max Countryman <ma...@me.com <javascript:> > > wrote: > >> Hi, >> >> I’m happy to announce a new release of Flake, the decentralized, >> k-ordered unique ID generator. >> >> Flake 0.4.0 includes a number of important breaking changes, but by far >> the most important is dropping `generate` in favor of `generate!` which now >> returns a ByteBuffer. Previously `generate` returned a BigInteger, however >> this arbitrarily limits how an application can handle IDs and goes against >> the spirit of the Erlang implementation. In order to maintain backwards >> compatibility, a helper `flake->bigint` was added to the core namespace. >> Applications which already consume flakes should update their calls to >> `generate` so they are `generate!` and wrap them with `flake->bigint` if >> BigIntegers are desirable or already used. >> >> Github: https://github.com/maxcountryman/flake >> Changes: https://github.com/maxcountryman/flake/blob/master/CHANGELOG.md >> >> Thanks! >> >> >> Max >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com >> <javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clo...@googlegroups.com <javascript:> > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+u...@googlegroups.com <javascript:> > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+u...@googlegroups.com <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
