Class: LogStash::JavaPipeline

Inherits:
JavaBasePipeline
  • Object
show all
Includes:
Util::Loggable
Defined in:
lib/logstash/java_pipeline.rb

Constant Summary collapse

MAX_INFLIGHT_WARN_THRESHOLD = 
10_000

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pipeline_config, namespaced_metric = nil, agent = nil) ⇒ JavaPipeline

Returns a new instance of JavaPipeline.



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# File 'lib/logstash/java_pipeline.rb', line 22

def initialize(pipeline_config, namespaced_metric = nil, agent = nil)
  @logger = self.logger
  super pipeline_config, namespaced_metric, @logger, agent
  open_queue

  @worker_threads = []

  @java_inputs_controller = org.logstash.execution.InputsController.new(lir_execution.javaInputs)

  @drain_queue =  settings.get_value("queue.drain") || settings.get("queue.type") == "memory"

  @events_filtered = java.util.concurrent.atomic.LongAdder.new
  @events_consumed = java.util.concurrent.atomic.LongAdder.new

  @input_threads = []
  # @ready requires thread safety since it is typically polled from outside the pipeline thread
  @ready = Concurrent::AtomicBoolean.new(false)
  @running = Concurrent::AtomicBoolean.new(false)
  @flushing = java.util.concurrent.atomic.AtomicBoolean.new(false)
  @flushRequested = java.util.concurrent.atomic.AtomicBoolean.new(false)
  @shutdownRequested = java.util.concurrent.atomic.AtomicBoolean.new(false)
  @outputs_registered = Concurrent::AtomicBoolean.new(false)

  # @finished_execution signals that the pipeline thread has finished its execution
  # regardless of any exceptions; it will always be true when the thread completes
  @finished_execution = Concurrent::AtomicBoolean.new(false)

  # @finished_run signals that the run methods called in the pipeline thread was completed
  # without errors and it will NOT be set if the run method exits from an exception; this
  # is by design and necessary for the wait_until_started semantic
  @finished_run = Concurrent::AtomicBoolean.new(false)

  @thread = nil
end

Instance Attribute Details

#events_consumed ⇒ Object (readonly)

Returns the value of attribute events_consumed.



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# File 'lib/logstash/java_pipeline.rb', line 13

def events_consumed
  @events_consumed
end

#events_filtered ⇒ Object (readonly)

Returns the value of attribute events_filtered.



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# File 'lib/logstash/java_pipeline.rb', line 13

def events_filtered
  @events_filtered
end

#started_at ⇒ Object (readonly)

Returns the value of attribute started_at.



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# File 'lib/logstash/java_pipeline.rb', line 13

def started_at
  @started_at
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/logstash/java_pipeline.rb', line 13

def thread
  @thread
end

#worker_threads ⇒ Object (readonly)

Returns the value of attribute worker_threads.



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# File 'lib/logstash/java_pipeline.rb', line 13

def worker_threads
  @worker_threads
end

Instance Method Details

#clear_pipeline_metrics ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 410

def clear_pipeline_metrics
  # TODO(ph): I think the metric should also proxy that call correctly to the collector
  # this will simplify everything since the null metric would simply just do a noop
  collector = metric.collector

  unless collector.nil?
    # selectively reset metrics we don't wish to keep after reloading
    # these include metrics about the plugins and number of processed events
    # we want to keep other metrics like reload counts and error messages
    collector.clear("stats/pipelines/#{pipeline_id}/plugins")
    collector.clear("stats/pipelines/#{pipeline_id}/events")
  end
end

#filter(event, &block) ⇒ Object

for backward compatibility in devutils for the rspec helpers, this method is not used anymore and just here to not break TestPipeline that inherits this class.



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# File 'lib/logstash/java_pipeline.rb', line 369

def filter(event, &block)
end

#filters? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/java_pipeline.rb', line 89

def filters?
  filters.any?
end

#finished_execution? ⇒ Boolean

def initialize

Returns:

  • (Boolean) 


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# File 'lib/logstash/java_pipeline.rb', line 57

def finished_execution?
  @finished_execution.true?
end

#flush_filters(options = {}, &block) ⇒ Object

for backward compatibility in devutils for the rspec helpers, this method is not used anymore and just here to not break TestPipeline that inherits this class.



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# File 'lib/logstash/java_pipeline.rb', line 374

def flush_filters(options = {}, &block)
end

#inputworker(plugin) ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 289

def inputworker(plugin)
  Util::set_thread_name("[#{pipeline_id}]<#{plugin.class.config_name}")
  begin
    plugin.run(wrapped_write_client(plugin.id.to_sym))
  rescue => e
    if plugin.stop?
      @logger.debug("Input plugin raised exception during shutdown, ignoring it.",
                    default_logging_keys(:plugin => plugin.class.config_name, :exception => e.message, :backtrace => e.backtrace))
      return
    end

    # otherwise, report error and restart
    @logger.error(I18n.t("logstash.pipeline.worker-error-debug",
                          default_logging_keys(
                            :plugin => plugin.inspect,
                            :error => e.message,
                            :exception => e.class,
                            :stacktrace => e.backtrace.join("\n"))))

    # Assuming the failure that caused this exception is transient,
    # let's sleep for a bit and execute #run again
    sleep(1)
    retry
  ensure
    plugin.do_close
  end
end

#inspect ⇒ Object

Sometimes we log stuff that will dump the pipeline which may contain sensitive information (like the raw syntax tree which can contain passwords) We want to hide most of what’s in here



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# File 'lib/logstash/java_pipeline.rb', line 427

def inspect
  {
    :pipeline_id => pipeline_id,
    :settings => settings.inspect,
    :ready => @ready,
    :running => @running,
    :flushing => @flushing
  }
end

#plugin_threads_info ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 396

def plugin_threads_info
  input_threads = @input_threads.select {|t| t.alive? }
  worker_threads = @worker_threads.select {|t| t.alive? }
  (input_threads + worker_threads).map {|t| Util.thread_info(t) }
end

#ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/java_pipeline.rb', line 61

def ready?
  @ready.value
end

#register_plugins(plugins) ⇒ Object

register_plugins calls #register_plugin on the plugins list and upon exception will call Plugin#do_close on all registered plugins

Parameters:

  • plugins (Array[Plugin]) —

    the list of plugins to register



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# File 'lib/logstash/java_pipeline.rb', line 191

def register_plugins(plugins)
  registered = []
  plugins.each do |plugin|
    plugin.register
    registered << plugin
  end
rescue => e
  registered.each(&:do_close)
  raise e
end

#run ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 143

def run
  @started_at = Time.now
  @thread = Thread.current
  Util.set_thread_name("[#{pipeline_id}]-pipeline-manager")

  start_workers

  @logger.info("Pipeline started", "pipeline.id" => pipeline_id)

  # Block until all inputs have stopped
  # Generally this happens if SIGINT is sent and `shutdown` is called from an external thread

  transition_to_running
  start_flusher # Launches a non-blocking thread for flush events
  wait_inputs
  transition_to_stopped

  @logger.debug("Input plugins stopped! Will shutdown filter/output workers.", default_logging_keys)

  shutdown_flusher
  shutdown_workers

  close

  @logger.debug("Pipeline has been shutdown", default_logging_keys)

  # exit code
  return 0
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/java_pipeline.rb', line 181

def running?
  @running.true?
end

#safe_pipeline_worker_count ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 65

def safe_pipeline_worker_count
  default = settings.get_default("pipeline.workers")
  pipeline_workers = settings.get("pipeline.workers") #override from args "-w 8" or config
  safe_filters, unsafe_filters = filters.partition(&:threadsafe?)
  plugins = unsafe_filters.collect { |f| f.config_name }

  return pipeline_workers if unsafe_filters.empty?

  if settings.set?("pipeline.workers")
    if pipeline_workers > 1
      @logger.warn("Warning: Manual override - there are filters that might not work with multiple worker threads", default_logging_keys(:worker_threads => pipeline_workers, :filters => plugins))
    end
  else
    # user did not specify a worker thread count
    # warn if the default is multiple
    if default > 1
      @logger.warn("Defaulting pipeline worker threads to 1 because there are some filters that might not work with multiple worker threads",
                   default_logging_keys(:count_was => default, :filters => plugins))
      return 1 # can't allow the default value to propagate if there are unsafe filters
    end
  end
  pipeline_workers
end

#shutdown(&before_stop) ⇒ Object

initiate the pipeline shutdown sequence this method is intended to be called from outside the pipeline thread

Parameters:

  • before_stop (Proc) —

    code block called before performing stop operation on input plugins



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# File 'lib/logstash/java_pipeline.rb', line 320

def shutdown(&before_stop)
  # shutdown can only start once the pipeline has completed its startup.
  # avoid potential race condition between the startup sequence and this
  # shutdown method which can be called from another thread at any time
  sleep(0.1) while !ready?

  # TODO: should we also check against calling shutdown multiple times concurrently?

  before_stop.call if block_given?

  stop_inputs

  # We make this call blocking, so we know for sure when the method return the shtudown is
  # stopped
  wait_for_workers
  clear_pipeline_metrics
  @logger.info("Pipeline terminated", "pipeline.id" => pipeline_id)
end

#shutdown_flusher ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 384

def shutdown_flusher
  @flusher_thread.close
end

#shutdown_workers ⇒ Object

After ‘shutdown` is called from an external thread this is called from the main thread to tell the worker threads to stop and then block until they’ve fully stopped This also stops all filter and output plugins



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# File 'lib/logstash/java_pipeline.rb', line 355

def shutdown_workers
  @shutdownRequested.set(true)

  @worker_threads.each do |t|
    @logger.debug("Shutdown waiting for worker thread" , default_logging_keys(:thread => t.inspect))
    t.join
  end

  filters.each(&:do_close)
  outputs.each(&:do_close)
end

#stalling_threads_info ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 402

def stalling_threads_info
  plugin_threads_info
    .reject {|t| t["blocked_on"] } # known benign blocking statuses
    .each {|t| t.delete("backtrace") }
    .each {|t| t.delete("blocked_on") }
    .each {|t| t.delete("status") }
end

#start ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 93

def start
  # Since we start lets assume that the metric namespace is cleared
  # this is useful in the context of pipeline reloading
  collect_stats
  collect_dlq_stats

  @logger.debug("Starting pipeline", default_logging_keys)

  @finished_execution.make_false
  @finished_run.make_false

  @thread = Thread.new do
    begin
      LogStash::Util.set_thread_name("pipeline.#{pipeline_id}")
      run
      @finished_run.make_true
    rescue => e
      close
      logger.error("Pipeline aborted due to error", default_logging_keys(:exception => e, :backtrace => e.backtrace))
    ensure
      @finished_execution.make_true
    end
  end

  status = wait_until_started

  if status
    logger.debug("Pipeline started successfully", default_logging_keys(:pipeline_id => pipeline_id))
  end

  status
end

#start_flusher ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 377

def start_flusher
  # Invariant to help detect improper initialization
  raise "Attempted to start flusher on a stopped pipeline!" if stopped?
  @flusher_thread = org.logstash.execution.PeriodicFlush.new(@flushRequested, @flushing)
  @flusher_thread.start
end

#start_input(plugin) ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 285

def start_input(plugin)
  @input_threads << Thread.new { inputworker(plugin) }
end

#start_inputs ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 266

def start_inputs
  moreinputs = []
  inputs.each do |input|
    if input.threadable && input.threads > 1
      (input.threads - 1).times do |i|
        moreinputs << input.clone
      end
    end
  end
  moreinputs.each {|i| inputs << i}

  # first make sure we can register all input plugins
  register_plugins(inputs)

  # then after all input plugins are successfully registered, start them
  inputs.each { |input| start_input(input) }
  @java_inputs_controller.startInputs(self)
end

#start_workers ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 202

def start_workers
  @worker_threads.clear # In case we're restarting the pipeline
  @outputs_registered.make_false
  begin
    maybe_setup_out_plugins

    pipeline_workers = safe_pipeline_worker_count
    batch_size = settings.get("pipeline.batch.size")
    batch_delay = settings.get("pipeline.batch.delay")

    max_inflight = batch_size * pipeline_workers

    config_metric = metric.namespace([:stats, :pipelines, pipeline_id.to_s.to_sym, :config])
    config_metric.gauge(:workers, pipeline_workers)
    config_metric.gauge(:batch_size, batch_size)
    config_metric.gauge(:batch_delay, batch_delay)
    config_metric.gauge(:config_reload_automatic, settings.get("config.reload.automatic"))
    config_metric.gauge(:config_reload_interval, settings.get("config.reload.interval"))
    config_metric.gauge(:dead_letter_queue_enabled, dlq_enabled?)
    config_metric.gauge(:dead_letter_queue_path, dlq_writer.get_path.to_absolute_path.to_s) if dlq_enabled?


    @logger.info("Starting pipeline", default_logging_keys(
      "pipeline.workers" => pipeline_workers,
      "pipeline.batch.size" => batch_size,
      "pipeline.batch.delay" => batch_delay,
      "pipeline.max_inflight" => max_inflight))
    if max_inflight > MAX_INFLIGHT_WARN_THRESHOLD
      @logger.warn("CAUTION: Recommended inflight events max exceeded! Logstash will run with up to #{max_inflight} events in memory in your current configuration. If your message sizes are large this may cause instability with the default heap size. Please consider setting a non-standard heap size, changing the batch size (currently #{batch_size}), or changing the number of pipeline workers (currently #{pipeline_workers})", default_logging_keys)
    end

    filter_queue_client.set_batch_dimensions(batch_size, batch_delay)

    pipeline_workers.times do |t|
      thread = Thread.new do
        Util.set_thread_name("[#{pipeline_id}]>worker#{t}")
        org.logstash.execution.WorkerLoop.new(
            lir_execution, filter_queue_client, @events_filtered, @events_consumed,
            @flushRequested, @flushing, @shutdownRequested, @drain_queue).run
      end
      @worker_threads << thread
    end

    # inputs should be started last, after all workers
    begin
      start_inputs
    rescue => e
      # if there is any exception in starting inputs, make sure we shutdown workers.
      # exception will already by logged in start_inputs
      shutdown_workers
      raise e
    end
  ensure
    # it is important to guarantee @ready to be true after the startup sequence has been completed
    # to potentially unblock the shutdown method which may be waiting on @ready to proceed
    @ready.make_true
  end
end

#stop_inputs ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 345

def stop_inputs
  @logger.debug("Closing inputs", default_logging_keys)
  inputs.each(&:do_stop)
  @java_inputs_controller.stopInputs
  @logger.debug("Closed inputs", default_logging_keys)
end

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/java_pipeline.rb', line 185

def stopped?
  @running.false?
end

#transition_to_running ⇒ Object

def run



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# File 'lib/logstash/java_pipeline.rb', line 173

def transition_to_running
  @running.make_true
end

#transition_to_stopped ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 177

def transition_to_stopped
  @running.make_false
end

#uptime ⇒ Fixnum

Calculate the uptime in milliseconds

Returns:

  • (Fixnum) —

    Uptime in milliseconds, 0 if the pipeline is not started



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# File 'lib/logstash/java_pipeline.rb', line 391

def uptime
  return 0 if started_at.nil?
  ((Time.now.to_f - started_at.to_f) * 1000.0).to_i
end

#wait_for_workers ⇒ Object

def shutdown



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# File 'lib/logstash/java_pipeline.rb', line 339

def wait_for_workers
  @logger.debug("Closing inputs", default_logging_keys)
  @worker_threads.map(&:join)
  @logger.debug("Worker closed", default_logging_keys)
end

#wait_inputs ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 261

def wait_inputs
  @input_threads.each(&:join)
  @java_inputs_controller.awaitStop
end

#wait_until_started ⇒ Object 



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# File 'lib/logstash/java_pipeline.rb', line 126

def wait_until_started
  while true do
    if @finished_run.true?
      # it completed run without exception
      return true
    elsif thread.nil? || !thread.alive?
      # some exception occurred and the thread is dead
      return false
    elsif running?
      # fully initialized and running
      return true
    else
      sleep 0.01
    end
  end
end