Solr简介，
原文地址：http://zh.hortonworks.com/apache/solr/
Rapid indexing & search on Hadoop
Apache Solr is the open source platform for searches of data stored in HDFS in Hadoop. Solr powers the search and navigation features of many of the world’s largest Internet sites, enabling powerful full-text search and near real-time indexing. Whether users search for tabular（表格式的）, text, geo-location or sensor（传感式） data in Hadoop, they find it quickly with Apache Solr.
WHAT SOLR DOES
Hadoop operators put documents in Apache Solr by “indexing” via XML, JSON, CSV or binary over HTTP.
Then users can query those petabytes of data via HTTP GET. They can receive XML, JSON, CSV or binary results. Apache Solr is optimized for high volume web traffic.
Top features include:
- Advanced full-text search
- Near real-time indexing
- Standards-based open interfaces like XML, JSON and HTTP
- Comprehensive HTML administration interfaces
- Server statistics exposed over JMX for monitoring
- Linearly scalable, auto index replication, auto failover and recovery
- Flexible and adaptable, with XML configuration
Solr is highly reliable, scalable and fault tolerant. Both data analysts and developers in the open source community trust Solr’s distributed indexing, replication and load-balanced querying capabilities.