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From Elias Torres <el...@torrez.us>
Subject Re: uuid-string not generating unique ids
Date Wed, 25 Jul 2007 19:17:22 GMT
It's just my laptop (IBM ThinkPad Core Duo 2.16Ghz).

-Elias

Patrick Linskey wrote:
> Great! What type of hardware are you running on, btw? We were already
> doing some testing in a pretty tight loop, but maybe Hotspot was being
> clever and optimizing it away.
> 
> -Patrick
> 
> On 7/25/07, Elias Torres <elias@torrez.us> wrote:
>> FYI, the patch worked.
>>
>> -Elias
>>
>> Patrick Linskey wrote:
>> > There have been a lot of changes since then, but things should be
>> > pretty compatible.
>> >
>> > If you've got a good test suite, I'd recommend switching to trunk and
>> > seeing what happens.
>> >
>> > -Patrick
>> >
>> > On 7/25/07, Elias Torres <elias@torrez.us> wrote:
>> >>
>> >> Thank you Patrick and Mark. I'm using 0.9.7, so I'm either patching it
>> >> or switching to trunk. Do you think it'd be safe (for an agile
>> >> development group) to switch to trunk from 0.9.7 or were there many
>> big
>> >> changes since then?
>> >>
>> >> Anyways, thanks again. I'll ask a couple of other things later.
>> >>
>> >> -Elias
>> >>
>> >> Patrick Linskey wrote:
>> >> > I just committed a change that will maybe resolve the issue. Please
>> >> > let us know if you see it come up again.
>> >> >
>> >> > I also logged the issue as OPENJPA-296.
>> >> >
>> >> > -Patrick
>> >> >
>> >> > On 7/25/07, Marc Prud'hommeaux <mprudhom@apache.org> wrote:
>> >> >> Patrick-
>> >> >>
>> >> >> I bet you are right. Your analysis of the problem looks correct
>> to me.
>> >> >>
>> >> >>
>> >> >> On Jul 25, 2007, at 9:12 AM, Patrick Linskey wrote:
>> >> >>
>> >> >> > Hi,
>> >> >> >
>> >> >> > Based on a quick read, it looks like maybe the problem is
>> >> >> > UUIDGenerator.java:178. I suspect that we should be changing
>> that to
>> >> >> > obtain another newTime inside the if block after incrementing
the
>> >> >> > sequence. However, I'm not an expert in this algorithm; does
>> anyone
>> >> >> > have a better grasp on it than do I?
>> >> >> >
>> >> >> > -Patrick
>> >> >> >
>> >> >> > On 7/25/07, Elias Torres <elias@torrez.us> wrote:
>> >> >> >>
>> >> >> >> Hi,
>> >> >> >>
>> >> >> >> First off, I want to say thank you for the hard work this
>> >> >> >> community has
>> >> >> >> put on this JPA implementation. I'm extremely eager in
>> getting to
>> >> >> >> know
>> >> >> >> it better and hopefully put it to good use in some of
the
>> projects
>> >> >> >> I'm
>> >> >> >> currently working on at IBM. If all goes well, I'll be
asking
>> >> some of
>> >> >> >> the harder questions later and possibly discuss new features
not
>> >> >> >> currently implemented.
>> >> >> >>
>> >> >> >> Now if you could please help me out with a small issue
I'm
>> having
>> >> >> >> with
>> >> >> >> uuid generation.
>> >> >> >>
>> >> >> >> @Entity
>> >> >> >> public class Foo {
>> >> >> >>
>> >> >> >>   @Id
>> >> >> >>   @GeneratedValue(strategy=GenerationType.AUTO, generator="uuid-
>> >> >> >> string")
>> >> >> >>   private String id;
>> >> >> >>
>> >> >> >> }
>> >> >> >>
>> >> >> >> CREATE TABLE Foo (
>> >> >> >>   id VARCHAR(16) NOT NULL
>> >> >> >> }
>> >> >> >>
>> >> >> >> If I do one em.persist() it works just fine. However,
if I do
>> a a
>> >> >> >> whole
>> >> >> >> list of them, I get exceptions (duplicate). If I enable
logging
>> >> I can
>> >> >> >> see they are all using the same id during INSERT. I stepped
a
>> bit
>> >> >> >> through the code and noticed that uuid-string doesn't
get
>> generated
>> >> >> >> while em.persist(), but much later while committing/flushing.
I
>> >> then
>> >> >> >> looked a bit (just a bit) at the UUID generator code and
noticed
>> >> that
>> >> >> >> the bytes are not changing much (maybe only the first
two), but
>> >> >> >> again,
>> >> >> >> that was while debugging, so I'm assuming I have a supa-fast
>> >> machine.
>> >> >> >>
>> >> >> >> Anybody running into the same problem? Any suggestions?
>> >> >> >>
>> >> >> >> -Elias
>> >> >> >>
>> >> >> >
>> >> >> >
>> >> >> > --
>> >> >> > Patrick Linskey
>> >> >> > 202 669 5907
>> >> >>
>> >> >>
>> >> >
>> >> >
>> >>
>> >
>> >
>>
> 
> 

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