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From "Aleksander M. Stensby" <>
Subject Re: Index confusion and organization
Date Tue, 27 Jun 2006 10:24:58 GMT
Thank you very much Erik!
I will definatly check into this. I'm currently using xfire in my  
implementation. I guess to big issue was/is that the indexing is done by  
one application, and the searching from several different applications.  

I have been bitten by the lucene-virus;) Heh, so I tend to think, hmm,  
maybe i should use an lucene index here instead!? :)

Trying to sort things out now, and recently moved most of my codebase to  
lucene 2.0.0. (some minor problem since i skipped the whole 1.9.0 step,  
and then in terms jumped past all the deprecation-warnings (doh!). :) But  
now it seems to be working just fine:) (well, apart from the  
searcher/writer/reader-mess :(

On Tue, 27 Jun 2006 12:06:27 +0200, Erik Hatcher  
<> wrote:

> Aleksander - if you're wrapping Lucene with a web service, you'd do well  
> to investigate Solr - - as it handles  
> all of the index management in a very elegant fashion.  It currently  
> does not support a SOAP interface, but rather a RESTful light-weight  
> custom XML format, but I'm sure a SOAP interface would be a welcome  
> contribution if that is what you're using.
> And yes, you're right it is tricky to manage and it often varies per- 
> project on the needs of IndexSearcher management.
> 	Erik
> On Jun 27, 2006, at 2:55 AM, Aleksander M. Stensby wrote:
>> Hello,
>> I tried sending this message yesterday, but I think i wasn't registered  
>> until now, so i'll post again. (Sorry if this gets doubled up).
>> I have recently started using Lucene and I must say i love it:)
>> But, i have a few questions (probably stupid ones), but still, here  
>> goes:
>> I have created one project that reads information from a database, then  
>> indexes this information in a Lucene Index. This process runs about 4  
>> times a day (the database has constant input flow).
>> In the beginning of my development i created a search engine project to  
>> search this engine (web-based) using lucene and spring. (i have yet to  
>> investigate Compass Framework)
>> I have recently found an increasing need to restructure my code-base  
>> and make the search logic available to other projects aswell. I  
>> therefore created a search-API and a search-luceneimpl project.
>> I then created another project, a web service offering the basic search  
>> feature, with a list of information beans as a return object.
>> the problem is this, (and the whole confusion regarding indexsearchers,  
>> writers and stuff:) ):
>> i noticed today that the webservice only access a "snapshot" of the  
>> index, from the actual moment the webservice was loaded. If i then  
>> reload the webservice context, the results will be "up-to-date" again.  
>> So it seems that i have done something wrong in my logic. (doh)
>> In the webservice, i load my searcher-class from the spring-context,  
>> setting it in the constructor.
>> The searcher-class have the following logic in its constructor:
>>   searcher = new IndexSearcher(indexPath);
>> then i have specified a close-method in the spring-context, which will  
>> call the close method containing the
>>   searcher.close();
>> I have read that one should only open one searcher object and use this  
>> for all searches, then close it when done... Well, that is a bit tricky  
>> i think. As for now i have to projects "reading" from the index (the  
>> old search-engine project) and this new web service. In addition the  
>> indexer-project is the only project writing to the index...
>> Any ideas or input to a mere beginner on how to organize this mess?
>> Sincerely yours,
>> Aleksander M. Stensby
>> --Aleksander M. Stensby
>> Software Developer
>> Integrasco A/S
>> Tlf.: +47 41 22 82 72
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Aleksander M. Stensby
Software Developer
Integrasco A/S
Tlf.: +47 41 22 82 72

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