Data Lake for Enterprises

Interceptor

As seen in the preceding figure, the channel processor then passes the events to the interceptor. Channel selector has instance of its interceptor attached to it.

Interceptors act upon event soon after the event is generated and before sending it to the channel. Flume gets this ability to modify and filter events with help from these interceptors. Interceptors are mainly classified into:

1. Built-in/predefined interceptors - As the name says these interceptors built-in in Flume. Some examples are:
   • Timestamp Interceptor: Inserts header of time in milliseconds when the event is acted upon.
   • Host Interceptor: Inserts host or IP of the machine where agent is running.
   • UUID Interceptor: Inserts universally unique identifier to every event. ...