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Status

Current state: Under Discussion

Discussion thread: None

JIRA: KAFKA-10186 [Aborting transaction with pending data should throw non-fatal exception]

Motivation

Currently in the Java client producer, if you try to abort a transaction with any pending (non-flushed) data, the exception thrown is a

 KafkaException("Failing batch since transaction was aborted")

This exception type is generally considered fatal. The is a valid state to be in - the . The point of throwing the exception is to alert that the records will not be sent, not that you are in an unrecoverable error state.

We should throw a different type of exception here to alert the user to the aborted transaction and distinguish this from fatal and recoverable errors.

Public Interfaces

Work in progress

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:

• Binary log format

• The network protocol and api behavior

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

  • org/apache/kafka/common/serialization

  • org/apache/kafka/common

  • org/apache/kafka/common/errors

  • org/apache/kafka/clients/producer

  • org/apache/kafka/clients/consumer (eventually, once stable)

• Monitoring

• Command line tools and arguments

• Anything else that will likely break existing users in some way when they upgrade

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.

Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?
• If we are changing behavior how will we phase out the older behavior?
• If we need special migration tools, describe them here.
• When will we remove the existing behavior?

Rejected Alternatives

If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.