Realtime NRT is a NRT implementation available for Solr 1.4.1 to Solr
4.0. To enable NRT it makes available a NRTIndexReader to the
IndexSearcher for searching the index. It does not close the
SolrIndexSearcher which is a very heavy object with caches, etc. to do
this. Since the Searcher is never closed it always uses the most recent
NRTIndexReader for searching and you get a pipe that is always filled
with new updated documents. The code changes are to handle this dynamic
pipe that may always have something new as in a realtime system.
Realtime NRT is different from soft commit as it does not close the
SolrIndexSearcher object every 1000 secs, invalidating the caches, etc.
SolrIndexSearcher is a very heavy object, ref. counted with caches, etc.
Closing it every time may turn out to be expensive.
I am contributing Realtime NRT to Solr 4.0 and am working on making
available a patch, etc.
Regards,
Nagendra Nagarajayya
http://solr-ra.tgels.org
http://rankingalgorithm.tgels.org
On 7/22/2012 2:03 PM, Darren Govoni wrote:
What exactly is "Realtime NRT" (Near Real Time)?
On Sun, 2012-07-22 at 14:07 -0700, Nagendra Nagarajayya wrote:
Hi!
I am very excited to announce the availability of Solr 4.0-ALPHA with
RankingAlgorithm 1.4.4 with Realtime NRT. The Realtime NRT
implementation now supports both RankingAlgorithm and Lucene. Realtime
NRT is a high performance and more granular NRT implementation as to
soft commit. The update performance is about 70,000 documents / sec*.
You can also scale up to 2 billion documents* in a single core, and
query half a billion documents index in ms**.
RankingAlgorithm 1.4.4 supports the entire Lucene Query Syntax, ± and/or
boolean queries and is compatible with the new Lucene 4.0-ALPHA api.
You can get more information about Solr 4.0-ALPHA with RankingAlgorithm
1.4.4 Realtime performance from here:
http://solr-ra.tgels.org/wiki/en/Near_Real_Time_Search_ver_4.x
You can download Solr 4.0-ALPHA with RankingAlgorithm 1.4.4 from here:
http://solr-ra.tgels.org
Please download and give the new version a try.
Regards,
Nagendra Nagarajayya
http://solr-ra.tgels.org
http://rankingalgorithm.tgels.org
* performance seen at a user installation of Solr 4.0 with
RankingAlgorithm 1.4.3
** performance seen when using the age feature
