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For existing errors, if the application code already handles the error, it will continue to do so. However, for TransactionAbortableException, a new exception the new TransactionAbortableException introduced in KIP-890 that extends KafkaException, it which is expected to be treated as fatal by applications with older code, as KafkaException is considered fatal by applications. Therefore, we expect TransactionAbortableException to also be treated as fatal by older code.

For applications using newer code

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