Voyage: image freeze/VOMongoError: Lazy reference not found

Hi Sabine,

yes... I have found that problem time to time too.
The way to solve it in mongo is to allow the collection to take dead references as "valid missing content". Of course, this is a dangerous feature, and that's why is not enabled by default.
To enable it, you need to add a property to the trip container:

Trip class>>mongoContainer
        <mongoContainer>

        ^ VOMongoContainer new
                enableMissingContent;
                yourself

that should solve your problem.

I could this "eventual integrity" and is very suspicious... but the only way I found to treat in image what could happen outside it... :)

cheers,
Esteban




On Aug 15, 2013, at 12:04 PM, Sabine Knöfel <[hidden email]> wrote:

> Hi Esteban,
>
> sorry but I need your help again.
>
> I succeeded in re-writing all my code to use voyage and can save all my
> model now. Great!
>
> Now I was experimenting with it and I have an Image freeze which should not
> occur in production;-).
>
> Situation:
>
> I created one Person with two trips. Trip points back to its person.
> After writing it into mongo, I delete one trip from mongo manually (I use
> rockmongo, great tool).
>
> So in the database, I have now
> 1) one Person which points to two trips
> 2) one trip (the other was deleted)
>
> Now, I do:
> Person selectAll first trips
>
> and the image freezes.
>
> Sometimes, I find in the DebugLog:
> VOMongoError: Lazy reference not found RKATrip: OID(103475906)
>
> This is correct ;-)
>
> I did also try with enableMissingContent but did not work.
> http://forum.world.st/Voyage-GC-collecting-random-objects-td4668438.html
>
> Sure, normally, we do not manipulate the database manually.
> But I want to be sure that the image does not freeze if this occurs....
>
> How can I solve this?
>
> regards
> Sabine
>
>
>
> ###########################################
> with this filein you can reproduce it easily
> ###########################################
> Object subclass: #Person
> instanceVariableNames: 'trips lastName'
> classVariableNames: ''
> poolDictionaries: ''
> category: 'RKA24-Demo'!
>
> !Person methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:02'!
> lastName
>
> ^ lastName! !
>
> !Person methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:02'!
> lastName: anObject
>
> lastName := anObject! !
>
> !Person methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:02'!
> trips
>
> ^ trips! !
>
> !Person methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:02'!
> trips: anObject
>
> trips := anObject! !
>
> "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "!
>
> Person class
> instanceVariableNames: ''!
>
> !Person class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 10:06'!
> isVoyageRoot
> ^true! !
>
> !Person class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 11:48'!
> mongoContainer
> <mongoContainer>
>
> ^VOMongoContainer new
> collectionName: 'testPersons';
> enableMissingContent;
> kind: Person;
> yourself! !
>
> !Person class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 10:13'!
> mongoTrips
> <mongoDescription>
>
> ^ VOMongoToManyDescription new
> attributeName: 'trips';
> kind: Trip;
> yourself! !
>
>
> Object subclass: #Trip
> instanceVariableNames: 'description person'
> classVariableNames: ''
> poolDictionaries: ''
> category: 'RKA24-Demo'!
>
> !Trip methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:04'!
> description
>
> ^ description! !
>
> !Trip methodsFor: 'accessing' stamp: 'sabineknoefel 8/12/2013 10:12'!
> description: anObject
>
> description := anObject! !
>
> !Trip methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:04'!
> person
>
> ^ person! !
>
> !Trip methodsFor: 'accessing' stamp: 'sabineknoefel 8/15/2013 10:04'!
> person: anObject
>
> person := anObject! !
>
> "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "!
>
> Trip class
> instanceVariableNames: ''!
>
> !Trip class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/12/2013 09:47'!
> isVoyageRoot
> ^true! !
>
> !Trip class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 11:48'!
> mongoContainer
> <mongoContainer>
>
> ^VOMongoContainer new
> collectionName: 'testTrips';
> enableMissingContent;
> kind: Trip;
> yourself! !
>
> !Trip class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 10:12'!
> mongoPerson
> "VOMongoRepository allInstancesDo: #reset. "
>
> <mongoDescription>
>
> ^ VOMongoToOneDescription new
> attributeName: 'person';
> kind:  Person;
> yourself ! !
>
> !Trip class methodsFor: 'as yet unclassified' stamp: 'sabineknoefel
> 8/15/2013 11:50'!
> testOnePersonTwoTrips
> | theTrip the2ndTrip thePerson |
> thePerson := Person new lastName: 'Knoefel'.
> theTrip := Trip new description: 'Trip to Munic'.
> the2ndTrip := Trip new description: 'Trip to Essen'.
> theTrip person: thePerson.
> the2ndTrip person: thePerson.
> thePerson trips: (OrderedCollection with: theTrip with: the2ndTrip ).
> theTrip save.
>
> VOMongoRepository allInstancesDo: #reset.
>
> "now I delete one trip from mongo"
>
> Person selectAll first trips! !
>
>
>
>
> --
> View this message in context: http://forum.world.st/Voyage-image-freeze-VOMongoError-Lazy-reference-not-found-tp4703739.html

> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>

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NAML

I've been bitten by this too.
This is when the "image" concept get counterproductive if you didn't
commit all your code changes. :-/

Esteban A. Maringolo

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NAML