Hello Derek,
See answers inline.
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Mark Bennett / LucidWorks: Search & Big Data / mark.benn...@lucidworks.com
Office: 408-898-4201 / Telecommute: 408-733-0387 / Cell: 408-829-6513
On Jun 9, 2014, at 12:00 AM, Derek Poh <d...@globalsources.com> wrote:
My company is actively looking at alternative search engine applications to
replace our current Endeca application.
I have no experience and knowledge on Solr and Lucene.
Please bear with me, I would like to find out if the following features are
available on Solr.
1. Aggregate results (rollups).
Eg. Froma list of search result of products (each has field = supplier id), can
the results be aggregated by supplier id with the original results ordering
retain.
Yes it can:
http://wiki.apache.org/solr/FieldCollapsing
2. Filter/Navigator, counts.
List out a field's possible values and their counts fromthe indexed data and
from the return results.
The field's values can be sorted by the values description or by the values
countsin the return results.
Yes, Solr calls these "Facets" and offers several types:
http://wiki.apache.org/solr/SimpleFacetParameters
http://wiki.apache.org/solr/HierarchicalFaceting
Eg. Field "Business Type" belowwith it's possible values and the count for each
value(in bracket). Can the field be return in the result with it's values sorted either
by description or bycounts?
Business Type
Manufacturer (15269)
Exporter (12493)
Trading Company (5541)
Agent (1324)
Wholesaler (1202)
Importer (682)
Buying Office (394)
Distributor (278)
Other (157)
Retailer (116)
Consultant (54)
Absolutely, and Solr is very fast and accurate.
3. Configureand defined the relevance rankingand matching logic of the return
result.
Yes, though not by that name.
Step 1:
Configure default edismax parameters in your solrconfig.xml
Step 2:
Create additional search handlers in solrconfig.xml, and each search handler
can have its own edismax configuration.
Normally the format of the search URL is:
http://localhost:8983/solr/collection_name/select?q=text:budget
You would replace the "select" with the name of the search handler that has the
edismax config you want.
With multiple search handlers, you'd use something like:
http://localhost:8983/solr/collection_name/search_freshest?q=text:budget
http://localhost:8983/solr/collection_name/search_most_popular?q=text:budget
4. Defined and configure the thesaurus (1-wayor 2-way), stemming and stop words.
Yes, Solr is very good about this, you have both options.
Also, Solr let's you choose:
* Index time, or query time, or both
* Use expansion or reduction
You can even have more than one thesaurus file and have them each handled
differently.
For example:
* Use an english_language thesaurus, which rarely changes, and expand that at
index time
* Use your company_synonyms, which may change frequently, and expand them at
search time.
I'll let you find these in the wiki, http://wiki.apache.org
5. Multi-language supportfor Simplified Chinese and Spanish.
Yes!
And for simplified Chinese, please make sure to use the SmartCN analyzer, and not the
simplistic "CJK"; SmartCN actually looks for Chinese language word breaks using
statistical methods, and therefore should give better results.
6. Scalability.
At present, we are indexing 4million recordsand the number is expected to
increase by more than 10 folds in the near future.
40 million documents can normally be handled on a single machine, assuming it
has enough RAM and doesn't have a lot of other stuff running.
You might want a second machine for failover.
When people use multiple machines, then the way to do that is via SolrCloud.
7. Search results debugging. Eg. why record was matchedor why record was ranked
as such.
Yes.
You typically add &debugQuery=true&debug.explain.structured=true to the URL.
The output is a bit technical, it takes some practice to understand.
There's also a graphical relevancy debugger with a free eval period:
http://www.lucidworks.com/market_app/lucidworks-relevancy-workbench/
Derek
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