[jira] [Created] (KAFKA-8409) Seperate controller thread/manager events from controller events

["Jose Armando Garcia Sancio (JIRA)" <ji...@apache.org>]

Jose Armando Garcia Sancio created KAFKA-8409:
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             Summary: Seperate controller thread/manager events from controller events
                 Key: KAFKA-8409
                 URL: https://issues.apache.org/jira/browse/KAFKA-8409
             Project: Kafka
          Issue Type: Improvement
          Components: controller
    Affects Versions: 2.4.0
            Reporter: Jose Armando Garcia Sancio
            Assignee: Jose Armando Garcia Sancio


The _ControllerEventManager_ and the _KafkaController_ are driven by processing _ControllerEvent_ in the queue. As of right now the _ControllerEventManager_ is responsible for handling _ShutdownEventThread_ while the _KafkaController_ handles all other events. Since we are using a _sealed trait_ the scala compiler is able to check that all cases are handle in match expressions.

To by pass this compiler feature the _KafkaController_ is matching on _ShutdownEventThread_ and ignoring the result. We should instead  create two type of events. For example:

{code}
sealed trait ControllerThreadEvent
final case object ShutdownEventThread extends ControllerThreadEvent
final case class ControllerEvent(event: ControllerEvent) extends ControllerThreadEvent
{code}

And remove _ShutdownEventThread_ from the _ControlleveEvent_ _sealed trait_. 



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