>
> On 29 Aug 2013, at 16:51, Esteban Lorenzano <[hidden email]> wrote:
>
>> hi
>>
>> well... I've never been happy on using the UUID generator for my keys, but is the fastest option I found.
>> There are, of course, alternatives:
>>
>> 1) Using your own number generator (sequential, or whatever). Problem with that is that is image based, then you need a persistence strategy... then you are slow.
>> 2) then you can use your own procedure in mongo... with same problem than (1)
>> 3) you could use timestamp. but TimeStamps are slow :(
>>
>> anyway... I open to ideas :)
>>
>> in the mean time, you can check if your UUID generator is using the primitive or not. In you are not, you have more possibilities of having a collision.
>
> Yes, the Smalltalk code (type 4 UUID) is just a random number that is computed in a complex way.
>
> What does the primitive actually do ? Is it different ?

>
>> Esteban
>>
>> On Aug 29, 2013, at 11:27 AM, Sabine Knöfel <[hidden email]> wrote:
>>
>>> Hi Esteban, All,
>>>
>>> I was proceeding to seach for the reason of the problem I described
>>> yesterday.
>>>
>>> I added some debugging code into VOMongoSerializer>>ensurePersisted: and the
>>> problem I described, did NOT occur.
>>>
>>> That made the whole process slower...and I had an idea....
>>>
>>> I was looking into >>UUIDGenerator default makeSeed.
>>> Then I tried the following code:
>>>
>>> |theOld theNew|
>>>
>>> 100000000 timesRepeat: [
>>> theNew :=  UUIDGenerator default makeSeed.
>>> theNew = theOld ifTrue: [self halt].
>>> theOld := theNew]
>>>
>>> The debugger came up! Doesn't that mean that, if the code is run very fast,
>>> there are double OIDs generated?!
>>>
>>> In my case, the objects for country and currency are very lightweight and
>>> so, they are created very fast. Also, the error occured much more often
>>> within my fast production EC2 instance as at my (old and slow) development
>>> pc.
>>>
>>> Important: I work with windows and so >>makeUnixSeed returns nil... :-)
>>>
>>> What is your opinion about that?
>>>
>>> Sabine
>>>
>>>
>>>
>>> --
>>> View this message in context: http://forum.world.st/voyage-mongo-randomly-wrong-OIDs-tp4705396p4705603.html
>>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>>>
>>
>>
>
>