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From Alessandro Benedetti <benedetti.ale...@gmail.com>
Subject Re: Query result ranking - Score independent
Date Wed, 08 Sep 2010 08:38:48 GMT
My request was very simple:
q= astronomy^0
And Solr returned the exception.
Maybe the zero boost factor is not causing the exception?

1) We indexed n documents with a Schema.xml.
2)Then we changed some field type in the Schema.xml
3)Then we indexed other m documents

Maybe this could cause the exception?



2010/9/7 Grant Ingersoll <gsingers@apache.org>

>
> On Sep 7, 2010, at 7:08 AM, Alessandro Benedetti wrote:
>
> > Hi all,
> > I need to retrieve query-results with a ranking independent from each
> > query-result's default lucene score, which means assigning the same score
> to
> > each query result.
> > I tried to use a zero boost factor ( ^0 ) to reset to zero each
> > query-result's score.
> > This strategy seems to work within the "example" solr instance, but in my
> > Solr instance, using a zero boost factor causes a Buffer Exception
> > (
> > HTTP Status 500 - null java.lang.IllegalArgumentException at
> > java.nio.Buffer.limit(Buffer.java:249) at
> >
> org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.readInternal(NIOFSDirectory.java:123)
> > at
> >
> org.apache.lucene.store.BufferedIndexInput.refill(BufferedIndexInput.java:157)
> > at
> >
> org.apache.lucene.store.BufferedIndexInput.readByte(BufferedIndexInput.java:38)
> > at org.apache.lucene.store.IndexInput.readInt(IndexInput.java:70) at
> > org.apache.lucene.store.IndexInput.readLong(IndexInput.java:93) at
> > org.apache.lucene.index.FieldsReader.doc(FieldsReader.java:210) at
> > org.apache.lucene.index.SegmentReader.document(SegmentReader.java:948) at
> >
> org.apache.lucene.index.DirectoryReader.document(DirectoryReader.java:506)
> > at org.apache.lucene.index.IndexReader.document(IndexReader.java:947)
> > )
>
> Hmm, that stack trace doesn't align w/ the boost factor.  What  was your
> request?  I think there might be something else wrong here.
>
> > Do you know any other technique to reset to some fixed constant value,
> all
> > the query-result's scores?
> > Each query result should obtain the same score.
> > Any suggestion?
>
>
> The ConstantScoreQuery or a Filter should do this.  You could do something
> like:
>
> &q=*:*&fq=<the real query>, as in &q=*:*&fq=field:foo
>
> -Grant
>
>
> --------------------------
> Grant Ingersoll
> http://lucenerevolution.org Apache Lucene/Solr Conference, Boston Oct 7-8
>
>


-- 
--------------------------

Benedetti Alessandro
Personal Page: http://tigerbolt.altervista.org

"Tyger, tyger burning bright
In the forests of the night,
What immortal hand or eye
Could frame thy fearful symmetry?"

William Blake - Songs of Experience -1794 England

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