flume 1.6 user guide - Wikitechy https://www.wikitechy.com/interview-questions/tag/flume-1-6-user-guide/ Interview Questions Wed, 15 Sep 2021 05:37:02 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png flume 1.6 user guide - Wikitechy https://www.wikitechy.com/interview-questions/tag/flume-1-6-user-guide/ 32 32 What are the channel types in Flume and Which channel type is faster ? https://www.wikitechy.com/interview-questions/apache-flume/what-are-the-channel-types-in-flume-and-which-channel-type-is-faster/ https://www.wikitechy.com/interview-questions/apache-flume/what-are-the-channel-types-in-flume-and-which-channel-type-is-faster/#respond Sun, 11 Jul 2021 16:10:38 +0000 https://www.wikitechy.com/interview-questions/?p=141

Channels in Flume

  • It stores events; events are delivered to the channel by means of sources operating within the agent.
  • An event remains in the channel until a sink removes it for further transport.
Flume Flow Crop

There are three different built in channels in Flume –

  • MEMORY Channel – Events are study from the source into memory and passed to the sink.
  • JDBC Channel – It stores the events in an embedded Derby database.
  • FILE Channel – It writes the contents to a file on the file system after reading the event from a source. The file is erased only after the contents are successfully delivered to the sink.

MEMORY Channel – It is the fastest channel among the three however has the risk of data loss. The channel that you choose totally depends on the nature of the big data application and the value of each event.

Apche Flume Features
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Channel Selectors

    • Channel selectors control and dividing the events and allocating a specific channel. They are default or replicated channel selectors.
Apache Flume Features
  • Replicated channel selectors can duplicate the information in multiple or all channels. Multiplexing channel selectors used to divide and aggregate the data based on the events header data.
  • It means based on sinks destination, the event aggregate into the specific sink.
  • Example: One sink associated with hadoop, another with S3 another with Hbase, at that time, Multiplexing channel selectors can divide the events and flow to the specific sink.
What are channel selectors

Learn Flume – Flume tutorial – what are channel selectors – Flume examples – Flume programs

  • Overview and Architecture, a source can write at least with one or more channels.
  • This is reason the property is plural channels instead of channel.
  • There are two ways multiple channels can be handled. The event can be written to every channel or to only one channel, based on some Flume header value.
  • The internal mechanism for this in Flume is known as channel selector.
  • The selector for any channel can be determined using the selector.type property.

All selector-specific properties start with the typical Source prefix: the agent name, keyword sources, and source name:

agent.sources.s1.selector.type=replicating
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