h12.me/kafka

A modular & idiomatic Kafka client in Go

Install

go get -u h12.me/kafka

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

• broker: client that talks to a single Kafka broker (concurrent, synchronous API wraps inside asynchronous request/response IO)
• cluster: client that talks to a Kafka cluster (leader/coordinator management)
• 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
• tools
  • kafpro: command line tool to query Kafka wire API
  • counter: command line tool to count messages
  • filler: command line tool to fill messages into a topic

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 (-)

Author

Hǎiliàng Wáng

Contributors

• Tao Huang