Apache Solr

Apache Solr

Apache Solr is the leading Open Source Enterprise Search solution and well-proven on thousands of WebPages and applications. Searchperience employs it as a search index, to which end it is configured and optimized accordingly.

Apache Solr Features

Apache Solr is based on the Lucene search library. Solr extends this engine and augments the search results with such interesting features as hit-highlighting, faceting, caching, replication and much more. Solr is one of the top 15 Open Source projects and in the top 5 Apache projects. 4,000 installations and 10,000 downloads per day testify to the size of its user community.

Apache Solr is also used by:

AOL
Apple
Panasonic
MTV
mySpace.com
eBay
SourceForge
Salesforce
Microsoft
Zappos

Features:

2 billion documents per index
> 1,000 searches a second per index
Logging
Caching
Distributed search, index replication and shards
Full text search with such features as stemming, splitting, filtering etc.
Flexible and convincing relevance evaluation
Powerful query options (Query)
and much more