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Status

Current state:  [One of " Under Discussion", "Accepted", "Rejected"]

Discussion thread: here [Change the link from the KIP proposal email archive to your own email thread]

JIRA: here [Change the link from KAFKA-95921 to your own ticket]

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

Public Interfaces

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

A public interface is any change to the following:

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Binary log format

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The network protocol and api behavior

Any class in the public packages under clientsConfiguration, especially client configuration

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org/apache/kafka/common/serialization

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org/apache/kafka/common

Currently if a transactional producer hits a fatal exception, the caller usually catches the exception and handle it by aborting the transaction by abortTxn(), and closing the the producer, which makes sense and sounds clean. The tricky scenario is that `abortTxn` is not a safe call when the producer is already in an error state, which means user has to do another try-catch with the first layer catch block, making the error handling pretty annoying. It is more appropriate and user-friendly to ensure that the transactional producer client does not throw an exception since users already intend to abort the transaction.

Public Interfaces

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org/apache/kafka/common/errors

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org/apache/kafka/clients

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Monitoring

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Command line tools and arguments

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Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.

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