Class: Sidekiq::Launcher

Inherits:
Object
  • Object
show all
Includes:
Component
Defined in:
lib/sidekiq/launcher.rb

Overview

The Launcher starts the Capsule Managers, the Poller thread and provides the process heartbeat.

Constant Summary collapse

STATS_TTL =

5 years

5 * 365 * 24 * 60 * 60
PROCTITLES = 
[
  proc { "sidekiq" },
  proc { Sidekiq::VERSION },
  proc { |me, data| data["tag"] },
  proc { |me, data| "[#{Processor::WORK_STATE.size} of #{me.config.total_concurrency} busy]" },
  proc { |me, data| "stopping" if me.stopping? }
]
BEAT_PAUSE = 
10
RTT_READINGS =

We run the heartbeat every five seconds. Capture five samples of RTT, log a warning if each sample is above our warning threshold.

RingBuffer.new(5)
RTT_WARNING_LEVEL = 
50_000
MEMORY_GRABBER = 
case RUBY_PLATFORM
when /linux/
  ->(pid) {
    IO.readlines("/proc/#{$$}/status").each do |line|
      next unless line.start_with?("VmRSS:")
      break line.split[1].to_i
    end
  }
when /darwin|bsd/
  ->(pid) {
    `ps -o pid,rss -p #{pid}`.lines.last.split.last.to_i
  }
else
  ->(pid) { 0 }
end

Instance Attribute Summary collapse

Attributes included from Component

#config

Instance Method Summary collapse

Methods included from Component

#fire_event, #handle_exception, #hostname, #identity, #logger, #process_nonce, #redis, #safe_thread, #tid, #watchdog

Constructor Details

#initialize(config, embedded: false) ⇒ Launcher

Returns a new instance of Launcher.



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# File 'lib/sidekiq/launcher.rb', line 25

def initialize(config, embedded: false)
  @config = config
  @embedded = embedded
  @managers = config.capsules.values.map do |cap|
    Sidekiq::Manager.new(cap)
  end
  @poller = Sidekiq::Scheduled::Poller.new(@config)
  @done = false
end

Instance Attribute Details

#managers ⇒ Object

Returns the value of attribute managers.



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# File 'lib/sidekiq/launcher.rb', line 23

def managers
  @managers
end

#poller ⇒ Object

Returns the value of attribute poller.



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# File 'lib/sidekiq/launcher.rb', line 23

def poller
  @poller
end

Instance Method Details

#beat ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 96

def beat
  $0 = PROCTITLES.map { |proc| proc.call(self, to_data) }.compact.join(" ") unless @embedded
  ❤
end

#check_rtt ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 202

def check_rtt
  a = b = 0
  redis do |x|
    a = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC, :microsecond)
    x.ping
    b = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC, :microsecond)
  end
  rtt = b - a
  RTT_READINGS << rtt
  # Ideal RTT for Redis is < 1000µs
  # Workable is < 10,000µs
  # Log a warning if it's a disaster.
  if RTT_READINGS.all? { |x| x > RTT_WARNING_LEVEL }
    logger.warn <<~EOM
      Your Redis network connection is performing extremely poorly.
      Last RTT readings were #{RTT_READINGS.buffer.inspect}, ideally these should be < 1000.
      Ensure Redis is running in the same AZ or datacenter as Sidekiq.
      If these values are close to 100,000, that means your Sidekiq process may be
      CPU-saturated; reduce your concurrency and/or see https://github.com/sidekiq/sidekiq/discussions/5039
    EOM
    RTT_READINGS.reset
  end
  rtt
end

#clear_heartbeat ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 101

def clear_heartbeat
  flush_stats

  # Remove record from Redis since we are shutting down.
  # Note we don't stop the heartbeat thread; if the process
  # doesn't actually exit, it'll reappear in the Web UI.
  redis do |conn|
    conn.pipelined do |pipeline|
      pipeline.srem("processes", [identity])
      pipeline.unlink("#{identity}:work")
    end
  end
rescue
  # best effort, ignore network errors
end

#flush_stats ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 117

def flush_stats
  fails = Processor::FAILURE.reset
  procd = Processor::PROCESSED.reset
  return if fails + procd == 0

  nowdate = Time.now.utc.strftime("%Y-%m-%d")
  begin
    redis do |conn|
      conn.pipelined do |pipeline|
        pipeline.incrby("stat:processed", procd)
        pipeline.incrby("stat:processed:#{nowdate}", procd)
        pipeline.expire("stat:processed:#{nowdate}", STATS_TTL)

        pipeline.incrby("stat:failed", fails)
        pipeline.incrby("stat:failed:#{nowdate}", fails)
        pipeline.expire("stat:failed:#{nowdate}", STATS_TTL)
      end
    end
  rescue => ex
    logger.warn("Unable to flush stats: #{ex}")
  end
end

#heartbeat ⇒ Object

If embedding Sidekiq, you can have the process heartbeat call this method to regularly heartbeat rather than creating a separate thread.



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# File 'lib/sidekiq/launcher.rb', line 80

def heartbeat
  ❤
end

#memory_usage(pid) ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 243

def memory_usage(pid)
  MEMORY_GRABBER.call(pid)
end

#quiet ⇒ Object

Stops this instance from processing any more jobs,



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# File 'lib/sidekiq/launcher.rb', line 47

def quiet
  return if @done

  @done = true
  @managers.each(&:quiet)
  @poller.terminate
  fire_event(:quiet, reverse: true)
end

#run(async_beat: true) ⇒ Object

Start this Sidekiq instance. If an embedding process already has a heartbeat thread, caller can use ‘async_beat: false` and instead have thread call Launcher#heartbeat every N seconds.



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# File 'lib/sidekiq/launcher.rb', line 38

def run(async_beat: true)
  logger.debug { @config.merge!({}) }
  Sidekiq.freeze!
  @thread = safe_thread("heartbeat", &method(:start_heartbeat)) if async_beat
  @poller.start
  @managers.each(&:start)
end

#start_heartbeat ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 88

def start_heartbeat
  loop do
    beat
    sleep BEAT_PAUSE
  end
  logger.info("Heartbeat stopping...")
end

#stop ⇒ Object

Shuts down this Sidekiq instance. Waits up to the deadline for all jobs to complete.



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# File 'lib/sidekiq/launcher.rb', line 57

def stop
  deadline = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC) + @config[:timeout]

  quiet
  stoppers = @managers.map do |mgr|
    Thread.new do
      mgr.stop(deadline)
    end
  end

  fire_event(:shutdown, reverse: true)
  stoppers.each(&:join)

  clear_heartbeat
end

#stopping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sidekiq/launcher.rb', line 73

def stopping?
  @done
end

#to_data ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 247

def to_data
  @data ||= {
    "hostname" => hostname,
    "started_at" => Time.now.to_f,
    "pid" => ::Process.pid,
    "tag" => @config[:tag] || "",
    "concurrency" => @config.total_concurrency,
    "queues" => @config.capsules.values.flat_map { |cap| cap.queues }.uniq,
    "weights" => to_weights,
    "labels" => @config[:labels].to_a,
    "identity" => identity,
    "version" => Sidekiq::VERSION,
    "embedded" => @embedded
  }
end

#to_json ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 267

def to_json
  # this data changes infrequently so dump it to a string
  # now so we don't need to dump it every heartbeat.
  @json ||= Sidekiq.dump_json(to_data)
end

#to_weights ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 263

def to_weights
  @config.capsules.values.map(&:weights)
end

#❤ ⇒ Object 



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# File 'lib/sidekiq/launcher.rb', line 140

def ❤
  key = identity
  fails = procd = 0

  begin
    flush_stats

    curstate = Processor::WORK_STATE.dup
    curstate.transform_values! { |val| Sidekiq.dump_json(val) }

    redis do |conn|
      # work is the current set of executing jobs
      work_key = "#{key}:work"
      conn.multi do |transaction|
        transaction.unlink(work_key)
        if curstate.size > 0
          transaction.hset(work_key, curstate)
          transaction.expire(work_key, 60)
        end
      end
    end

    rtt = check_rtt

    fails = procd = 0
    kb = memory_usage(::Process.pid)

    _, exists, _, _, signal = redis { |conn|
      conn.multi { |transaction|
        transaction.sadd("processes", [key])
        transaction.exists(key)
        transaction.hset(key, "info", to_json,
          "busy", curstate.size,
          "beat", Time.now.to_f,
          "rtt_us", rtt,
          "quiet", @done.to_s,
          "rss", kb)
        transaction.expire(key, 60)
        transaction.rpop("#{key}-signals")
      }
    }

    # first heartbeat or recovering from an outage and need to reestablish our heartbeat
    fire_event(:heartbeat) unless exists > 0
    fire_event(:beat, oneshot: false)

    ::Process.kill(signal, ::Process.pid) if signal && !@embedded
  rescue => e
    # ignore all redis/network issues
    logger.error("heartbeat: #{e}")
    # don't lose the counts if there was a network issue
    Processor::PROCESSED.incr(procd)
    Processor::FAILURE.incr(fails)
  end
end