[KAFKA-14758] Extract inner classes from Fetcher for reuse in refactoring

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.5.0
• Component/s: clients, consumer
• Labels: consumer-threading-refactor
• Assignee: Kirk True
• Reporter: Kirk True
• Reviewer: Guozhang Wang
• Created: 24/Feb/23 19:46
• Updated: 04/Oct/23 16:50
• Resolved: 14/Mar/23 15:25

Description

The Fetcher class 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.

This task includes refactoring Fetcher by extracting out the inner classes into top-level (though still in internal) so that those classes can be referenced by forthcoming refactored fetch logic.

Issue Links

• blocks: KAFKA-14365 Extract common logic from Fetcher
• is part of: KAFKA-14246 Update threading model for Consumer
• links to: GitHub Pull Request #13301