Hi Raj,
I'm guessing your slug field is much shorter and thus a match in that field has
more weight than a match is a much longer story field. If you omit norms for
those fields in the schema (and reindex), I believe you will see File 4 drop to
position #4.
Otis
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- Original Message
From: Nemani, Raj raj.nem...@turner.com
To: solr-user@lucene.apache.org
Sent: Mon, April 11, 2011 4:12:52 PM
Subject: Question on Dismax plugin
All,
I have a question on the Dismax plugin for the search handler. I have
two test instances of Solr. In one I am using the default search
handler. In this case, the fields that I am working with (slug and
story) are indexed via the all_text filed and the searches are done on
the all_text field.
For the other one I have configured a search handler using the dismax
plugin as shown below.
requestHandler name=mydismax class=solr.SearchHandler
lst name=defaults
str name=defTypedismax/str
str name=echoParamsexplicit/str
float name=tie0.01/float
str name=qf
story^3.0 slug^0.2
/str
int name=ps100/int
str name=q.alt*:*/str
/lst
/requestHandler
To make testing easier, I only have 4 (same) documents in both indexes
with the word Obama appearing inside as described below.
File 1:: The word Obama appears zero times in slug field and four
times in story field
File 2:: The word Obama appears zero times in slug field and thrice in
story field
File 3:: The word Obama appears zero times in slug field and two times
in story field
File 4:: The word Obama appears One time in slug field and one time in
story field
Here is the order of the documents in the order of decreasing scores
from the search results
Dismax Search Handler (steadily decreasing scores):
* File 1:: The word Obama appears zero times in slug field and
four times in story field
* File 4:: The word Obama appears One time in slug field and
one time in story field
* File 2:: The word Obama appears zero times in slug field and
thrice in story field
* File 3:: The word Obama appears zero times in slug field and
two times in story field
Standard Search handler:
* File 1:: The word Obama appears zero times in slug field and
four times in story field
* File 2:: The word Obama appears zero times in slug field and
thrice in story field (same score as File 4 score below)
* File 4:: The word Obama appears One time in slug field and
one time in story field (same score as File 2 score above)
* File 3:: The word Obama appears zero times in slug field and
two times in story field
My question, why is dismax showing File 4:: The word Obama appears One
time in slug field and one time in story field
ahead of
File 2:: The word Obama appears zero times in slug field and thrice
in story field given that I have boosted these fields as shown below.
str name=qf
story^3.0 slug^0.2
/str
I would have thought that the File 4:: The word Obama appears One time
in slug field and one time in story field would have gone all the
way done in the result list.
Any help is appreciated
Thanks much in advance
Raj
