Peter:

You may want to take a look at Solr 3.4 with RankingAlgorithm 1.3. It has
NRT support that allows you to search in real time with updates. The
performance is about 10000 docs / sec with the MBArtists index (approx 43
fields ). MBArtists index is the index of artists from musicbrainz.org in
the Solr 1.4 Enterprise Server book. 

Regards data visibility, you can configure this as a parameter in
solrconfig.xml as below:
           <realtime visible="200" facet="false">true</realtime>

The visible attribute, 200 is in ms and controls the max duration updated
docs may not be visible in a search. The facet attribute, can be true or
false depending on if you need real time faceting. Real time faceting,
depending on update load (for high updates), can see performance problems as
field cache is invalidated. So turn it on as needed. 

You can get more information about the NRT with Solr 3.x and
RankingAlgorithm 1.3 from here:
http://solr-ra.tgels.com/wiki/en/Near_Real_Time_Search_ver_3.x

You can download  Solr 3.4 with RankingAlgorithm 1.3 from here:
http://solr-ra.tgels.org

(there is an early access Solr 3.5 with RankingAlgorithm 1.3 release
available for download also)

Regards,

- Nagendra Nagarajayya
http://solr-ra.tgels.org
http://rankingalgorithm.tgels.org


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