[dna-dev] Several interesting InfoQ articles about JCR

[Randall Hauch]

You're right that JCR handles heterogeneous data better than almost  
anything else, especially when the information structure changes/ 
evolves over time.

And I thought the InfoQ architecture was brilliant - use multiple  
independent JCRs for infrequently changing data, eliminating the need  
to create/maintain/scale a cluster.  Very elegant and simple  
solution.  And in this particular case, it doesn't really matter if  
there is a slight difference in content among the different machines  
during the push of new information to the independent repositories.

But can you elaborate on your thought that JCR might not be useful for  
transactional data?

IMO, JCR is useful in a lot of situations, and of course it is limited  
in others.  Right now, the implementations don't do clustering or very  
large repositories well.  Most impls also seem to be limited in the  
efficient handling of large numbers of children for any given node.   
Incorporation of information outside of JCR is also difficult, as it  
has to be done above JCR - although DNA will change this.  But I'm not  
sure that frequently changing data is universally a limitation.   
Perhaps frequent additions of large volumes of data are a problem  
because you quickly get to volumes of data that are too large.  Or  
frequent changes to data may be a problem if versioning is used, as it  
could quickly lead to unusable numbers of versions.


On Jun 10, 2008, at 9:45 PM, Michael Neale wrote:

> JCR seems to have a lot of traction I have noticed. Certainly seems to
> be the default choice now for heterogenous data. And data is
> increasingly heterogenous.
>
> I guess my only thoughts on it are its limitations: should JCR *not*
> be used for transactional data - ie feeds of incoming data that change
> often?
>
> On Wed, Jun 11, 2008 at 12:11 PM, Randall Hauch <rhauch at redhat.com>  
> wrote:
>> There have been a couple of recent articles on InfoQ about JCR and/ 
>> or REST.
>> In case you haven't seen them, they're all worth a good read.
>>
>> Interview with David Nuescheler, from Day Software:
>> http://www.infoq.com/articles/nuescheler-jcr-rest
>> InfoQ architecture and use of JCR:
>> http://www.infoq.com/presentations/design-and-architecture-of-infoq
>>
>> Best regards,
>> Randall
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>>
>
>
>
> -- 
> Michael D Neale
> home: www.michaelneale.net
> blog: michaelneale.blogspot.com