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

Motivation

The kafka-consumer-perf-test tool is a great tool for quickly assessing raw consumer performance. Currently, it subscribes to all partitions and provides an overview of the entire cluster's performance. However, the tool does not support testing the performance of a single broker or partition. Introducing this capability would be highly beneficial for debugging and estimating capacity and resource requirements.

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This modification provided the Hardware team with a straightforward method to conduct experiments and verify resolutions, ultimately streamlining the troubleshooting process and ensuring smoother operations.

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:

Add following new optional parameters to kafka-consumer-perf-test:

• partitions
  List of partitions to fetch data from. Multiple partitions can be provided as a comma-separated list. e.g. --partitions 0,1,2
• offsets
  List of offsets to start reading from. If specified, the list must have the same number of elements as the partitions list in the same sequence. If not specified, starts reading from earliest unless --from-latest is specified. Only works with --partitions option.

• 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.

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