Jason Gustafson created KAFKA-8472:
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Summary: Use composition for better isolation of fetcher logic
Key: KAFKA-8472
URL: https://issues.apache.org/jira/browse/KAFKA-8472
Project: Kafka
Issue Type: Improvement
Reporter: Jason Gustafson
Assignee: Jason Gustafson
Currently the log dir fetcher and the replica fetcher extend from
`AbstractFetcherThread` even though the logic they implement is independent of
the follower state machine. We can simplify testing and maintain a cleaner
separation of concerns by pulling the behavior that needs to be customized into
a separate trait. So the `FetcherThread` implementation can focus on the state
machine and the new trait focuses on fetch mechanics (i.e. how to pull data
from the source log) while avoiding the pitfalls of class inheritance.
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