Install

go get -u h12.io/kpax

Talk

I gave a talk about Kpax at Gopher Meetup Shanghai 2016. See the slides.

Design

The client is built on top of Kafka Wire Protocol (i.e. low-level API). The protocol related types & marshal/unmarshal functions are automatically generated by wipro from the HTML spec).

(-) means to be done.

Sub packages

• model is an abstraction model for request, response, broker and cluster
• broker is a lazy, asynchronous and recoverable round tripper that talks to a single Kafka broker
• cluster is a metadata manager that talks to a Kafka cluster
• proto contains both low level API and a “middle” level facade
• producer: fault tolerant high-level producer (batching and partitioning strategy)
• consumer: fault tolerant high-level consumer (consumer group and offset commit)
• log: replaceable global logger
• cmd
  • kpax: command line tool to help with Kafka programming

Compatibility

Compatible with Kafka Server 0.8.2.

Error Handling

• broker
  • fail fast: timeout returns error immediately
  • release resources carefully
  • reconnect when requested next time
• client
  • metadata reload lazily (only when a leader/coordinator cannot be found in cache)
  • leader/coordinator should be deleted on error
• producer
  • fail over to another partition
  • failed partition will be retried again after a period of time
  • partition expand (-)
• consumer
  • just loop & wait on error
  • partition expand (-)
• graceful shutdown (-)

Efficiency

• efficiency
  • batching
  • consumer response
  • consumer request (-)
  • producer (-)
  • decompression
  • snappy
  • gzip (-)
  • compression
  • snappy (-)
  • gzip (-)