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Apache Flume is a framework based on streaming data flows for collecting, aggregating, and transferring large quantities of data. Flume is an efficient and reliable distributed service. A unit of data flow in Flume is called an event. The main components in Flume architecture are Flume source, Flume channel, and Flume sink, all of which are hosted by a Flume agent. A Flume source consumes events from an external source such as a log file or a web server. A Flume source stores the events it receives in a passive data store called a Flume channel. Examples of Flume channel types are a JDBC channel, a file channel, and a memory channel. The Flume sink component removes the events from the Flume channel and puts them in an external storage such as HDFS. A Flume sink can also forward events to another Flume source to be processed by another Flume agent. The Flume architecture for a single-hop data flow is shown in Figure 6-1.
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