ElasticSearch
ElasticSearch could be opted if, We build a web site or an application and want to add search to it, and then it hits us: getting search working is hard. We want our search solution to be fast, we want a painless setup and a completely free search schema, we want to be able to index data simply using JSON over HTTP, we want our search server to be always available, we want to be able to start with one machine and scale to hundreds, we want real-time search, we want simple multi-tenancy, and we want a solution that is built for the cloud.
Its feature 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.
http://www.elasticsearch.com
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