[Solr Wiki] Update of "NearRealtimeSearch" by NagendraNagarajayya

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The "NearRealtimeSearch" page has been changed by NagendraNagarajayya.
The comment on this change is: Solr and NRT with RankingAlgorithm.
http://wiki.apache.org/solr/NearRealtimeSearch?action=diff&rev1=4&rev2=5

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  <!> [[Solr4.0]]
  
  = What is Near Realtime Search? =
- 
  Please see http://wiki.apache.org/lucene-java/NearRealtimeSearch
  
  = Solr and NRT =
+  * Lucene 2.9 has added some NRT capabilities such as loading field caches per segment and carrying deletes over in RAM.
  
-   * Lucene 2.9 has added some NRT capabilities such as loading field caches per segment and carrying deletes over in RAM.  
+  * Solr needs to cache filters per segment (see [[http://issues.apache.org/jira/browse/SOLR-1308|SOLR-1308]])
  
-   * Solr needs to cache filters per segment (see [[http://issues.apache.org/jira/browse/SOLR-1308|SOLR-1308 ]])
+  * Replicate segments RAM -> RAM in order to scale effectively (see [[http://issues.apache.org/jira/browse/SOLR-1278|SOLR-1278]])
  
-   * Replicate segments RAM -> RAM in order to scale effectively (see [[http://issues.apache.org/jira/browse/SOLR-1278|SOLR-1278 ]])
+  * Special tuning for this scenario can be found on the NearRealtimeSearchTuning wiki page
  
-   * Special tuning for this scenario can be found on the NearRealtimeSearchTuning wiki page
+ = Solr and NRT with RankingAlgorithm =
+  * NRT for Solr 1.4.1 is available with RankingAlgorithm. No changes are needed to your code, except for enabling NRT in solrconfig.xml
+  * The NRT functionality allows you  to add documents without the IndexSearchers being closed or caches being  cleared. A commit is not needed with the document update. Searches can  run concurrently with document updates. No changes are needed except for  enabling the NRT through solrconfig.xml. The performance is about  262  TPS (document adds) on a dual core intel system with 2GB heap with  searches in parallel. The performance at the moment is limited by how  fast IndexWriter.getReader() performs.
+  * More info about NRT (download tweets, schema, solrconfig.xml), http://solr-ra.tgels.com/papers/solr-ra_real_time_search.pdf
+  * Download Solr with RankingAlgorithm from here, [[http://solr-ra.tgels.com/|http://solr-ra.tgels.com]]