David Spencer wrote:
> I'm on JDK 1.4.2_06 and Tomcat 4+. Had issues w/ the Tomcat 5.5+/JDK
1.5
> combo so I rolled back.
There have been issues with Tomcat 5.5, although supposedly the latest
version has them resolved. I'm using Tomcat 5.0.28 with JDK 1.5.0_01,
which has been solid -- no problems at all. But your combo should be
fine; I just want to verify Miles Barr's changes to remove the 1.5
dependencies from my classes.
> The baseline will presumably use the default Lucene Similarity and
Query
> Parser.
I think the baseline should use Lucene's MultiFieldQueryParser to expand
the query to search both title and body fields, as this is presumably
the current "out-of-the-box" solution. Similarly, it should use Lucene
1.4.3, the current official release; is this what you are using? There
may be a desire to use the CVS HEAD instead, which I have never run
with.
> For "your case" you'll need to tell me if I need to call
> DistributingMultiFieldQueryParser or whatnot.
Yes, you need something like this:
private static final String[] DEFAULT_FIELDS = {"title", "body"};
private static final float[] DEFAULT_BOOSTS = {3.0f, 1.0f};
DistributingMultiFieldQueryParser.parse(
queryString, DEFAULT_FIELDS, DEFAULT_BOOSTS, new
StandardAnalyzer());
DEFAULT_FIELDS should contain whatever list of fields you are using
(that should be searched for simple query terms containing no explicit
field specs). DEFAULT_BOOSTS must be in 1:1 correspondence with
DEFAULT_FIELDS.
> Also, dumb question...do I need to build an index for every impl of
> Similarity? Thus there will be "n" indexes and wikipedia-sim.jsp
will
> search in each one with the corresponding Similarity?
Yes, you will need a separate index for each Similarity, as some values
computed from the similarity are stored in the index.
I'll send you a Similarity and an initial value for DEFAULT_BOOSTS later
today or tomorrow.
Can you put up an explain mechanism to support tuning? I'll want to
tune the DEFAULT_BOOSTS and various Similarity factors based on the
collection.
Thanks,
Chuck
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