[WIP] KAFKA-18376: High CPU load when AsyncKafkaConsumer uses a small max poll value #20521
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… max poll value Introduces CompositePollEvent and CompositePollResult to refactor and streamline the poll event handling in AsyncKafkaConsumer and ApplicationEventProcessor. The new approach enables multi-step polling logic, improves callback and background event processing, and enhances testability. Also adds size methods to BackgroundEventHandler and OffsetCommitCallbackInvoker, disables several tests, and updates related classes to support the new event flow.
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Introduces
CompositePollEventandCompositePollResultto streamline the poll event handling in AsyncKafkaConsumer and ApplicationEventProcessor. The new approach enables multi-step polling logic, where possible.