FAQ
Hi,

I read the lucene-book about scoring and read a bit of the javadoc but
I can't seem to find somewhere expectations of the bouds for the score
value.
I had believe the score would end up between 0 and 1 but I seem to keep
having values under 0.2. It may be due to my special requests but...
how can I be sure of this ?

thanks

paul


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  • Erik Hatcher at Jun 20, 2005 at 12:49 pm

    On Jun 18, 2005, at 7:39 PM, Paul Libbrecht wrote:
    I read the lucene-book about scoring and read a bit of the javadoc
    but I can't seem to find somewhere expectations of the bouds for
    the score value.
    I had believe the score would end up between 0 and 1 but I seem to
    keep having values under 0.2. It may be due to my special requests
    but... how can I be sure of this ?
    Hits from all non-HitCollector searches are "normalized". Normalized
    in this sense means that if the top-scoring document scores higher
    than 1.0 it is normalized to 1.0 and that ratio is used to normalize
    all scores. However, if the top-scoring document is under 1.0, the
    scores are left as-is.

    Searches using a HitCollector are always left as-is.

    Have a look at IndexSearcher.explain() results for document/query
    combinations to see what is causing the lower than expected scores.

    Erik


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  • Youngho Cho at Jun 21, 2005 at 2:23 am
    Hello,

    I develop our system using lucene 1.4.3 with RemoteSearchable.
    Currently I got the following error message.
    But I don't konw why it happend and how to fix it.

    Could you explain what situation give the following error ???

    Thanks.

    Youngho

    java.io.IOException: read past EOF
    at org.apache.lucene.store.InputStream.refill(InputStream.java:154)
    at org.apache.lucene.store.InputStream.readByte(InputStream.java:43)
    at org.apache.lucene.store.InputStream.readBytes(InputStream.java:57)
    at org.apache.lucene.index.SegmentReader.norms(SegmentReader.java:356)
    at org.apache.lucene.index.MultiReader.norms(MultiReader.java:159)
    at org.apache.lucene.search.TermQuery$TermWeight.scorer(TermQuery.java:64)
    at org.apache.lucene.search.BooleanQuery$BooleanWeight.scorer(BooleanQuery.java:165)
    at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:85)
    at org.apache.lucene.search.RemoteSearchable.search(RemoteSearchable.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
    at sun.rmi.transport.Transport$1.run(Transport.java:148)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
    at java.lang.Thread.run(Thread.java:534)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
    at com.nannet.fulcrum.lucene.util.RefinedRemoteSearchable_Stub.search(Unknown Source)
    at org.apache.lucene.search.MultiSearcherThread.run(ParallelMultiSearcher.java:251)

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postedJun 19, '05 at 9:54p
activeJun 21, '05 at 2:23a
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