[hibernate-dev] [Search] Lazy initialization vs HSearch - Round 4

[Emmanuel Bernard]

My initial reaction is if you really need transactional consistency is to do run a transaction commit every n operations. But that may not be ok for your application. 
We could imagine more or less what you are describing. This is an idea we want to explore to offer consistency between the index and the database even within a non committee transaction. Basically flushing changes to an in memory index plus some smart hand waving to via index filters to hide deleted elements from the committed indexes. 

I don't think this is really going to be an easy task but if you have some spare time, that would be awesome to start digging in this area. 

On 10 déc. 2012, at 21:45, Guillaume Smet <guillaume.smet at gmail.com> wrote:

> On Mon, Dec 10, 2012 at 9:07 PM, Guillaume Smet
> <guillaume.smet at gmail.com> wrote:
>> On Mon, Dec 10, 2012 at 8:27 PM, Guillaume Smet
>> <guillaume.smet at gmail.com> wrote:
>>> Is it transactionally safe?
>> 
>> From what I read, it's not.
>> 
>> Do you see any way to get this type of pattern working in a
>> transactionally safe way?
> 
> Hmmm, just handwaving at the moment but couldn't we imagine that,
> instead of flushing to the indexes, we could flush to a "buffer" of
> Lucene documents. I think it could reduce the memory footprint
> compared to keeping all the entities in memory while allowing us to
> keep the operation transactional? And it might allow us to get the
> above case working.
> 
> Perhaps, flushing to a queue of Lucene documents isn't the right idea
> but we could prepare/"compile" the LuceneWork to whatever is
> convenient for this particular operation (Lucene document, query for
> deletion...), get rid of the entity and all the entity related stuff
> and apply the works at the commit of the transaction as it's already
> done.
> 
> I'm pretty sure it could be an interesting compromise - if doable.
> 
> Any thoughts?
> 
> -- 
> Guillaume
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