Module: Karafka::Pro::Processing::Strategies::Aj::DlqMom

Includes:
Dlq::Mom
Included in:
DlqFtrLrjMom
Defined in:
lib/karafka/pro/processing/strategies/aj/dlq_mom.rb

Overview

ActiveJob enabled DLQ enabled Manual offset management enabled

AJ has manual offset management on by default and the offset management is delegated to the AJ consumer. This means, we cannot mark as consumed always. We can only mark as consumed when we skip given job upon errors. In all the other scenarios marking as consumed needs to happen in the AJ consumer on a per job basis.

Constant Summary collapse

FEATURES =

Features for this strategy

%i[
  active_job
  dead_letter_queue
  manual_offset_management
].freeze

Instance Method Summary collapse

Methods included from Dlq::Default

#build_dlq_message, #dispatch_to_dlq, #dispatch_to_dlq?, #find_skippable_message

Methods included from Default

#handle_before_consume, #handle_before_enqueue, #handle_consume, #handle_revoked

Methods included from Karafka::Processing::Strategies::Default

#commit_offsets, #commit_offsets!, #handle_before_consume, #handle_before_enqueue, #handle_consume, #handle_idle, #handle_revoked, #handle_shutdown, #mark_as_consumed, #mark_as_consumed!

Methods included from Karafka::Processing::Strategies::Base

#handle_before_consume, #handle_before_enqueue, #handle_consume, #handle_idle, #handle_revoked, #handle_shutdown

Instance Method Details

#handle_after_consume ⇒ Object

How should we post-finalize consumption.



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# File 'lib/karafka/pro/processing/strategies/aj/dlq_mom.rb', line 38

def handle_after_consume
  coordinator.on_finished do
    return if revoked?

    if coordinator.success?
      # Do NOT commit offsets, they are comitted after each job in the AJ consumer.
      coordinator.pause_tracker.reset
    elsif coordinator.pause_tracker.attempt <= topic.dead_letter_queue.max_retries
      retry_after_pause
    else
      coordinator.pause_tracker.reset
      skippable_message, = find_skippable_message
      dispatch_to_dlq(skippable_message) if dispatch_to_dlq?
      # We can commit the offset here because we know that we skip it "forever" and
      # since AJ consumer commits the offset after each job, we also know that the
      # previous job was successful
      mark_as_consumed(skippable_message)
      pause(coordinator.seek_offset, nil, false)
    end
  end
end