lucene-java-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Mohammad Norouzi" <mnr...@gmail.com>
Subject Re: regarding FieldSelector
Date Wed, 12 Sep 2007 11:40:30 GMT
Hi Grant,
Really thanks for your nice document about advanced Lucene. it was very
useful for me.

as I understand, we can set some large fields to be lazily loading, now my
question is when it will be loaded? it make sense when we call
doc.get("field_name")
it will load from the index, Am I right?

in my application, I've provided a result set structure to navigate between
results and documents and provide a get(String fieldname) method just like
java.sql.ResultSet.getString() method, and also this result set implements
HitCollector in order to collect my own ID rather than Lucene's document id,
so I think I can set my field ID to be loaded always and the other fields to
be lazily loading, Does this improve the search process?

again, thank you very much indeed.


On 9/12/07, Grant Ingersoll <gsingers@apache.org> wrote:
>
> Hi Mohammad,
>
> The typical use cases are:
> 1. You have several small fields used in a results display and one or
> two large fields (i.e. the original document) and you don't want to
> pay the cost of loading the large fields for results display because
> most of them won't be chosen.  When a result is chosen, the lazily
> loaded field will be retrieved.
>
> 2. You only want to load certain fields, or the first field, or you
> just want to know the size of a field.
>
> Basically, it gives you control over how fields are loaded from disk
> in Lucene.
>
> See my ApacheCon Europe presentation http://cnlp.org/presentations/
> slides/AdvancedLuceneEU.pdf for a few slides (towards the end) on
> FieldSelector.
>
> On Sep 12, 2007, at 5:13 AM, Mohammad Norouzi wrote:
>
> > Hi all,
> >
> > Can anyone explain what is the FieldSelector and the usage or
> > benefits of
> > this structure? I read the javadocs but I can't get for what goal
> > it is
> > provided in Lucene.
> >
> > Thanks in advance
> >
> > --
> > Regards,
> > Mohammad
> > --------------------------
> > see my blog: http://brainable.blogspot.com/
> > another in Persian: http://fekre-motefavet.blogspot.com/
>
> --------------------------
> Grant Ingersoll
> http://lucene.grantingersoll.com
>
> Lucene Helpful Hints:
> http://wiki.apache.org/lucene-java/BasicsOfPerformance
> http://wiki.apache.org/lucene-java/LuceneFAQ
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>


-- 
Regards,
Mohammad
--------------------------
see my blog: http://brainable.blogspot.com/
another in Persian: http://fekre-motefavet.blogspot.com/

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message