elasticsearch

Elasticsearch is a distributed RESTful search engine built for the cloud. Features include: + Distributed and Highly Available Search Engine. - Each index is fully sharded with a configurable number of shards. - Each shard can have one or more replicas. - Read / Search operations performed on either one of the replica shard. + Multi Tenant with Multi Types. - Support for more than one index. - Support for more than one type per index. - Index level configuration (number of shards, index storage, ...). + Various set of APIs - HTTP RESTful API - Native Java API. - All APIs perform automatic node operation rerouting. + Document oriented - No need for upfront schema definition. - Schema can be defined per type for customization of the indexing process. + Reliable, Asynchronous Write Behind for long term persistency. + (Near) Real Time Search. + Built on top of Lucene - Each shard is a fully functional Lucene index - All the power of Lucene easily exposed through simple configuration/plugins. + Per operation consistency - Single document level operations are atomic, consistent, isolated and durable.