I am using Lucene 3.6 and i am trying to implement FieldCache. I have seen some posts but did not get any clear idea. Can anyone please suggest me any link where i can find proper example of FieldCache and how to use it while searching.
You dont typically use it directly, it is an internal API used by Lucene.
If you are extending Lucene's search API and need to use it, you will need to provide more details.
Related
I am beginner in solr7.5.0 and I don't know each and every modules of it. As I'm building question answer system I want to integrate wordnet so I can get better query responses. I googled it and found some methods and previous question but I'm really confused on how to do in solr version 7.5.0 step by step.
Edit: solr7.5.0 having WordnetSynonymParser class, So if anyone worked on same please guide me how I can use this class or is there another way to do it? and can I use python to do it?
thanks in advance.
This article is very useful for this question, and the integration of wordnet can be done by, there are WordNet prolog file('wn_s.pl') which has synsets, we can convert it to synonyms.txt which can be consumable by Solr. So, to convert wn_s.pl file we can use Syns2Syms.java. It generates Synonyms.txt which we can index to solr.
But WordNet expansion will only yield marginal gains in relevance if it is domain specific search, so simply creating your own synonyms list based on the common tokens in your index will give more relevance.
I am trying to use Lucene with EclipseLink, and was wondering if there are any good integration libraries out there? I have seen solar-flare, and it looks lime it might do what I want, but it's out of date (although i have an older version of EclipseLink, I am using 4.10 of Lucene) That may work, but I cant find any documentation, examples or tutorials on how to use it.
Any advice would be appreciated (I dont believe we can switch to Hibernate either)
Thanks in advance
If you are ready to use Lucene via a server you can use Solr (with SolrJ)
SolJ provide to you the annotations to annotate your Pojo (look at this: https://wiki.apache.org/solr/Solrj#Directly_adding_POJOs_to_Solr)
I have an opensearch description and am supposed to send my queries using that programmatically. Unfortunately, I'm really new to all of this- are there any examples out there using Lucene and Java?
Thanks!
I don't know nothing about OpenSearch but I can give you some hints of Lucene. To make Lucene search you have to first make a Lucene index of your data (text files, xml files, database, etc..).
There are a lot of example how to use Lucene all over the internet. This looks quite good example how to make a Lucene index.
This covers all: indexing, searching and displaying result (It is very simple example). Because your question is not very specific, this is as I can help. If you'll have a specific problem, I would be happy to help.
I posted this in the Nabble group also, but figured may get some advice here.
is there a way to get SOLR to search whatever index i tell it to during search time without using multiple cores?
i dont build my indexes with SOLR, i build them with my own java class, but i do use SOLR to search them later. It would be nice to tell Solr during search time which index to access.
I have combined them as well, and this works but there are a few issues in my particular case, that make it easier to solve with sending the index name/path at search.
thanks
I don't really think you can really do what you are looking for here. Part of the simplicity of Solr comes from have the core (and therefore index) in the URL. What you could do is hack how Solr works to add another parameter to the url and then when Solr goes to do a search use that to determine which index it uses. I think you might end up throwing out all the auto warming of caches etc though.
Out of curiosity, why do you NOT want to use multiple cores? Is it that you expect to have thousands and thousands, or that each index is incredibly transient?
Eric
You might want to look into Lucid Works' Enterprise Solr release.
http://www.lucidimagination.com/products/lucidworks-search-platform/enterprise
They implement Collections in a way that is similar to your use case.
I had hoped this was baked into the most recent release, but if it is, I can't find the docs via a simple Google search. Failing that, I'd prefer a simple library, but I'll settle for a tutorial.
Thanks.
Ibator can help you with this. Let it autogenerate everything, and you'll find by-Example Queries in the SQL Maps, as well as corresponding Java bindings in the DAOs.
Check "Example Class Usage Notes" on http://ibatis.apache.org/docs/tools/ibator/ for more information.