What is Channel Selectors ?

Editor — Sun, 11 Jul 2021 15:50:47 +0000

Channel Selectors

- Channel selectors control and dividing the events and allocating a specific channel. They are default or replicated channel selectors.

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.

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

Editor — Sun, 11 Jul 2021 15:29:39 +0000

Apache Flume offers interceptors as a method of modifying records as they have a Flume channel.
Interceptors are used to filter the events between source and channel, channel and sink. These channels will filter un-necessary or targeted log files.

Interceptors are a part of Flume’s extensibility model. They permit events to be inspected as they pass between a source and a channel, and also the developer is liberated to modify or drop events as needed. Interceptors in the chain along to create a pipeline process.