Heliosearch – The Next Solr Project Heliosearch is about creating the next major evolution of Solr. To kick things off, I’ve started a project on github and implemented “off-heap” filters, as a first step toward taking performance to the next … Continued
Solr took another step toward increasing it’s NoSQL datastore capabilities, with the addition of realtime get. Background As readers probably know, Lucene/Solr search works off of point-in-time snapshots of the index. After changes have been made to the index, a … Continued
Lucene’s default ranking function uses factors such as tf, idf, and norm to help calculate relevancy scores. Solr has now exposed these factors as function queries. docfreq(field,term) returns the number of documents that contain the term in the field. termfreq(field,term) … Continued
I previously introduced Solr’s Result Grouping, also called Field Collapsing, that limits the number of documents shown for each “group”, normally defined as the unique values in a field or function query. Since then, there have been a number of … Continued
Result Grouping, also called Field Collapsing, has been committed to Solr! This functionality limits the number of documents for each “group”, usually defined by the unique values in a field (just like field faceting). You can think of it like … Continued
Solr 1.4 contains a new feature that allows range queries or range filters over arbitrary functions. It’s implemented as a standard Solr QParser plugin, and thus easily available for use any place that accepts the standard Solr Query Syntax by … Continued
With CPU cores constantly increasing, there has been some major work done in Lucene/Solr to increase the scalability under multi-threaded load. Read-only IndexReaders One bottleneck was synchronization around the checking of deleted docs in a Lucene IndexReader. Since another thread … Continued
Having performance issues with Solr’s faceted search and certain types of fields? Help has arrived in the form of a new Solr faceting algorithm! This new faceting implementation dramatically improves the performance of faceted search, making it suitable for a … Continued
A new chapter in Solr scalability has been opened with the addition of distributed search! http://wiki.apache.org/solr/DistributedSearch Distributed Search splits an index into multiple shards, and queries across all the shards, combining the results and presenting a single merged response that … Continued
