Kirk True created KAFKA-14365:
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Summary: Refactor Fetcher to allow different implementations
Key: KAFKA-14365
URL: https://issues.apache.org/jira/browse/KAFKA-14365
Project: Kafka
Issue Type: Improvement
Components: clients, consumer
Reporter: Kirk True
Assignee: Kirk True
The `Fetcher` API is used internally by the `KafkaConsumer` to fetch records
from the brokers. There is ongoing work to create a new consumer implementation
with a significantly refactored threading model. The threading refactor work
requires a similarly refactored `Fetcher`. In order to keep the existing
`KafkaConsumer` as untouched as possible, this Jira proposes to refactor the
`Fetcher` so as to allow other implementations to use the unit tests and
`KafkaConsumer`.
Here are the proposed steps:
# Extract out the common APIs used by the `KafkaConsumer` and related unit
tests into a new Java interface named `Fetcher`
# Rename the existing `Fetcher` as `KafkaFetcher` (or similar)
# Refactor the `KafkaConsumer`, `FetcherTest`, and other call sites to
primarily use the new `Fetcher` interface
A future pull request will add the new `Fetcher` implementation and tie it in
to the existing `FetcherTest` tests.
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