Still, no luck. I am not able to search on a single field let alone multiple
fields per class.
I tried debugging the code and this is what I found:
* I see the field listed in the FIELD_NAMES HashSet in QueryFilters.java.
* LuceneQueryOptimizer's method: optimize has a call to searcher.search and
this returns no TopDocs in the case of author. If I do a search on "url" it
works fine and I see results.
* I tried changing the boost value. No effect.
The fields that I am searching on are not tokenized. I don't have any
analyzers defined. Is this a problem?
What else could be wrong?
Could this be a problem with Lucene or am I missing some configuration?
Thanks,
Gautham
Sagar Naik-2 wrote:
>
> Hey,
> Pl see the answers to the questions below.
> Gautham Pai wrote:
>> I have seen this question being asked multiple times in this forum.
>> However
>> this has confused me more because each has its own approach to solving
>> the
>> issue and no one has outlined the steps in one place. The tutorials seem
>> to
>> be a bit outdated too.
>>
>> The version of Nutch I am using is 0.9.
>>
>> I have 3 custom fields that I have added via an IndexingFilter. The
>> fields
>> are: author, title and description. I now intend to provide support for
>> querying these fields as:
>> author:Gautham
>> title:Nutch
>> etc.
>>
>> I added an Author class as follows:
>>
>> public class Author extends RawFieldQueryFilter {
>> private Configuration conf;
>>
>> public Author() {
>> super("author", 5f);
>> }
>>
>> public void setConf(Configuration conf) {
>> this.conf = conf;
>> }
>>
>> public Configuration getConf() {
>> return this.conf;
>> }
>> }
>>
>> and made an entry in plugin.xml as:
>>
>> <extension id="query.Author"
>> name="Author"
>> point="org.apache.nutch.searcher.QueryFilter">
>> <implementation id="Author"
>> class="query.Author">
>> <parameter name="fields" value="author"/>
>> </implementation>
>> </extension>
>>
>> When I use NutchBean to perform the query, I see no results. I also tried
>> changing the RawFieldQueryFilter to QueryFilter and following the
>> approach
>> used in the query-more plugin. It does not seem to work either.
>>
>> The questions I have specifically are:
>> * Do I need to create one class per custom field that I intend to provide
>> support for query?
>>
> Generally, one class for all the custom fields is sufficient. In your
> case too, u should be able to do with one class
>> * Should I use RawFieldQueryFilter or QueryFilter?
>>
> RawFieldQueryFilter implements QueryFilter , So I would use
> RawfieldQueryFilter.
>> * Should I make an entry as: <parameter name="fields" value="author"/> or
>> <parameter name="fields" value="DEFAULT"/> in plugin.xml?
>>
>>
> In your case,
>
> <parameter name="fields" value="author, title, description"/> should solve
> the problem.
> Check "out org.apache.nutch.searcher.QueryFilters" class's Ctor.
>
>> Any help or pointers is greatly appreciated.
>>
>> Thanks,
>> Gautham.
>>
>
>
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