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Druid (open-source data store)
Druid is a column-oriented open-source distributed data store written in Java. Druid is designed to quickly ingest massive quantities of event data, making that data immediately available to queries.〔Hemsoth, Nicole. ("Druid Summons Strength in Real-Time" ), ''datanami'', 08 November 2012〕 This is sometimes referred to as real-time data.
On the developer Q&A site Stack Overflow, Druid is described as "open-source infrastructure for real-time exploratory analytics on large datasets."〔(Stackoverflow shorthand tag description )〕 It is designed to ingest event/log data, chunking and compressing that data into column-based queryable segments.〔Monash, Curt. ("Metamarkets Druid Overview" ), ''DBMS2'', 16 June 2012〕
== Architecture〔(Druid Project Documentation )〕 ==
Fully deployed, Druid runs as a cluster of specialized nodes to support a fault-tolerant architecture where data is stored redundantly and there are multiple members of each node type.〔Yang, Fangjin; Tschetter, Eric; Léauté, Xavier; Ray, Nelson; Merlino, Gian; Ganguli, Deep. ("Druid: A Real-time Analytical Data Store" ), ''Metamarkets'', retrieved 6 February 2014〕 In addition, the cluster includes external dependencies for coordination (Apache ZooKeeper), storage of metadata (Mysql), and a deep storage facility (e.g., HDFS, Amazon S3, or Apache Cassandra).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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