Class: Karafka::Web::Processing::Consumers::Aggregators::State::Steps::RefreshCurrentStats

Inherits:
Base
  • Object
show all
Defined in:
lib/karafka/web/processing/consumers/aggregators/state/steps/refresh_current_stats.rb

Overview

Refreshes the counters that are computed based on incoming reports and not a total sum.

For this we use active reports we have in memory. It may not be accurate for the first few seconds but it is much more optimal from performance perspective than computing this fetching all data from Kafka for each view.

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Karafka::Web::Processing::Consumers::Aggregators::State::Steps::Base

Instance Method Details

#call ⇒ Object

Resets and recomputes the context.state[:stats] snapshot from context.active_reports



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# File 'lib/karafka/web/processing/consumers/aggregators/state/steps/refresh_current_stats.rb', line 19

def call
  stats = context.state[:stats]

  stats[:busy] = 0
  stats[:enqueued] = 0
  stats[:waiting] = 0
  stats[:workers] = 0
  stats[:processes] = 0
  stats[:rss] = 0
  stats[:listeners] = { active: 0, standby: 0 }
  stats[:lag_hybrid] = 0
  stats[:bytes_received] = 0
  stats[:bytes_sent] = 0
  utilization = 0

  context
    .active_reports
    .values
    .reject { |report| report[:process][:status] == "stopped" }
    .each do |report|
      report_stats = report[:stats]
      report_process = report[:process]

      lags_hybrid = []

      iterate_partitions(report) do |partition_stats|
        lag_stored = partition_stats[:lag_stored]
        lag = partition_stats[:lag]

        lags_hybrid << (lag_stored.negative? ? lag : lag_stored)
      end

      stats[:busy] += report_stats[:busy]
      stats[:enqueued] += report_stats[:enqueued]
      stats[:waiting] += report_stats[:waiting] || 0
      stats[:workers] += report_process[:workers] || 0
      stats[:bytes_received] += report_process[:bytes_received] || 0
      stats[:bytes_sent] += report_process[:bytes_sent] || 0
      stats[:listeners][:active] += report_process[:listeners][:active]
      stats[:listeners][:standby] += report_process[:listeners][:standby]
      stats[:processes] += 1
      stats[:rss] += report_process[:memory_usage]
      stats[:lag_hybrid] += lags_hybrid.compact.reject(&:negative?).sum
      utilization += report_stats[:utilization]
    end

  stats[:utilization] = stats[:processes].zero? ? 0.0 : utilization / stats[:processes]
end