Module: Karafka::Pro::Processing::AdaptiveIterator::Consumer

Defined in:
lib/karafka/pro/processing/adaptive_iterator/consumer.rb

Overview

Consumer enhancements needed to wrap the batch iterator for adaptive iterating It automatically marks as consumed, ensures that we do not reach max.poll.interval.ms and does other stuff to simplify user per-message processing

Instance Method Summary collapse

Instance Method Details

#each(*args) ⇒ Object

Parameters:

  • args (Array) —

    anything accepted by Karafka::Messages::Messages#each



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# File 'lib/karafka/pro/processing/adaptive_iterator/consumer.rb', line 24

def each(*args)
  adi_config = topic.adaptive_iterator

  tracker = Tracker.new(
    adi_config.safety_margin,
    coordinator.last_polled_at,
    topic.subscription_group.kafka.fetch(:'max.poll.interval.ms')
  )

  messages.each(*args) do |message|
    # Always stop if we've lost the assignment
    return if revoked?
    # No automatic marking risk when mom is enabled so we can fast stop
    return if Karafka::App.done? && topic.manual_offset_management?

    # Seek request on done will allow us to stop without marking the offset when user had
    # the automatic offset marking. This should not be a big network traffic issue for
    # the end user as we're stopping anyhow but should improve shutdown time
    if tracker.enough? || Karafka::App.done?
      # Enough means we no longer have time to process more data without polling as we
      # risk reaching max poll interval. Instead we seek and we will poll again soon.
      seek(message.offset, reset_offset: true)

      return
    end

    tracker.track { yield(message) }

    # Clean if this is what user configured
    message.clean! if adi_config.clean_after_yielding?

    public_send(adi_config.marking_method, message)
  end
end