Class: Fluent::KafkaOutputBuffered

Inherits:
BufferedOutput
  • Object
show all
Includes:
Fluent::KafkaPluginUtil::SSLSettings, Fluent::KafkaPluginUtil::SaslSettings
Defined in:
lib/fluent/plugin/out_kafka_buffered.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Fluent::KafkaPluginUtil::SaslSettings

included

Methods included from Fluent::KafkaPluginUtil::SSLSettings

included, #read_ssl_file

Constructor Details

#initialize ⇒ KafkaOutputBuffered

Returns a new instance of KafkaOutputBuffered.



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 87

def initialize
  super

  require 'kafka'
  require 'fluent/plugin/kafka_producer_ext'

  @kafka = nil
  @producers = {}
  @producers_mutex = Mutex.new
end

Instance Attribute Details

#field_separator ⇒ Object

Returns the value of attribute field_separator.



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 81

def field_separator
  @field_separator
end

#output_data_type ⇒ Object

Returns the value of attribute output_data_type.



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 80

def output_data_type
  @output_data_type
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 128

def configure(conf)
  super

  if @zookeeper
    require 'zookeeper'
  else
    @seed_brokers = @brokers.match(",").nil? ? [@brokers] : @brokers.split(",")
    log.info "brokers has been set directly: #{@seed_brokers}"
  end

  if conf['ack_timeout_ms']
    log.warn "'ack_timeout_ms' parameter is deprecated. Use second unit 'ack_timeout' instead"
    @ack_timeout = conf['ack_timeout_ms'].to_i / 1000
  end

  @f_separator = case @field_separator
                 when /SPACE/i then ' '
                 when /COMMA/i then ','
                 when /SOH/i then "\x01"
                 else "\t"
                 end

  @formatter_proc = setup_formatter(conf)

  @producer_opts = {max_retries: @max_send_retries, required_acks: @required_acks}
  @producer_opts[:ack_timeout] = @ack_timeout if @ack_timeout
  @producer_opts[:compression_codec] = @compression_codec.to_sym if @compression_codec

  if @discard_kafka_delivery_failed
    log.warn "'discard_kafka_delivery_failed' option discards events which cause delivery failure, e.g. invalid topic or something."
    log.warn "If this is unexpected, you need to check your configuration or data."
  end

  if @active_support_notification_regex
    require 'active_support/notifications'
    require 'active_support/core_ext/hash/keys'
    ActiveSupport::Notifications.subscribe(Regexp.new(@active_support_notification_regex)) do |*args|
      event = ActiveSupport::Notifications::Event.new(*args)
      message = event.payload.respond_to?(:stringify_keys) ? event.payload.stringify_keys : event.payload
      @router.emit("fluent_kafka_stats.#{event.name}", Time.now.to_i, message)
    end
  end
end

#deliver_messages(producer, tag) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 237

def deliver_messages(producer, tag)
  if @discard_kafka_delivery_failed
    begin
      producer.deliver_messages
    rescue Kafka::DeliveryFailed => e
      log.warn "DeliveryFailed occurred. Discard broken event:", :error => e.to_s, :error_class => e.class.to_s, :tag => tag
      producer.clear_buffer
    end
  else
    producer.deliver_messages
  end
end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 183

def emit(tag, es, chain)
  super(tag, es, chain, tag)
end

#format_stream(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 187

def format_stream(tag, es)
  es.to_msgpack_stream
end

#get_producer ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 200

def get_producer
  @producers_mutex.synchronize {
    producer = @producers[Thread.current.object_id]
    unless producer
      producer = @kafka.producer(@producer_opts)
      @producers[Thread.current.object_id] = producer
    end
    producer
  }
end

#refresh_client(raise_error = true) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 98

def refresh_client(raise_error = true)
  if @zookeeper
    @seed_brokers = []
    z = Zookeeper.new(@zookeeper)
    z.get_children(:path => @zookeeper_path)[:children].each do |id|
      broker = Yajl.load(z.get(:path => @zookeeper_path + "/#{id}")[:data])
      @seed_brokers.push("#{broker['host']}:#{broker['port']}")
    end
    z.close
    log.info "brokers has been refreshed via Zookeeper: #{@seed_brokers}"
  end
  begin
    if @seed_brokers.length > 0
      logger = @get_kafka_client_log ? log : nil
      @kafka = Kafka.new(seed_brokers: @seed_brokers, client_id: @client_id, logger: logger, ssl_ca_cert: read_ssl_file(@ssl_ca_cert),
                         ssl_client_cert: read_ssl_file(@ssl_client_cert), ssl_client_cert_key: read_ssl_file(@ssl_client_cert_key),
                         sasl_gssapi_principal: @principal, sasl_gssapi_keytab: @keytab)
      log.info "initialized kafka producer: #{@client_id}"
    else
      log.warn "No brokers found on Zookeeper"
    end
  rescue Exception => e
    if raise_error # During startup, error should be reported to engine and stop its phase for safety.
      raise e
    else
      log.error e
    end
  end
end

#setup_formatter(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 211

def setup_formatter(conf)
  if @output_data_type == 'json'
    require 'yajl'
    Proc.new { |tag, time, record| Yajl::Encoder.encode(record) }
  elsif @output_data_type == 'ltsv'
    require 'ltsv'
    Proc.new { |tag, time, record| LTSV.dump(record) }
  elsif @output_data_type == 'msgpack'
    require 'msgpack'
    Proc.new { |tag, time, record| record.to_msgpack }
  elsif @output_data_type =~ /^attr:(.*)$/
    @custom_attributes = $1.split(',').map(&:strip).reject(&:empty?)
    @custom_attributes.unshift('time') if @output_include_time
    @custom_attributes.unshift('tag') if @output_include_tag
    Proc.new { |tag, time, record|
      @custom_attributes.map { |attr|
        record[attr].nil? ? '' : record[attr].to_s
      }.join(@f_separator)
    }
  else
    @formatter = Fluent::Plugin.new_formatter(@output_data_type)
    @formatter.configure(conf)
    @formatter.method(:format)
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 177

def shutdown
  super
  shutdown_producers
  @kafka = nil
end

#shutdown_producers ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 191

def shutdown_producers
  @producers_mutex.synchronize {
    @producers.each { |key, producer|
      producer.shutdown
    }
    @producers = {}
  }
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 172

def start
  super
  refresh_client
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka_buffered.rb', line 250

def write(chunk)
  tag = chunk.key
  def_topic = @default_topic || tag
  producer = get_producer

  records_by_topic = {}
  bytes_by_topic = {}
  messages = 0
  messages_bytes = 0
  record_buf = nil
  record_buf_bytes = nil

  begin
    chunk.msgpack_each { |time, record|
      begin
        if @output_include_time
          if @time_format
            record['time'.freeze] = Time.at(time).strftime(@time_format)
          else
            record['time'.freeze] = time
          end
        end

        record['tag'] = tag if @output_include_tag
        topic = (@exclude_topic_key ? record.delete('topic'.freeze) : record['topic'.freeze]) || def_topic
        partition_key = (@exclude_partition_key ? record.delete('partition_key'.freeze) : record['partition_key'.freeze]) || @default_partition_key
        partition = (@exclude_partition ? record.delete('partition'.freeze) : record['partition'.freeze]) || @default_partition
        message_key = (@exclude_message_key ? record.delete('message_key'.freeze) : record['message_key'.freeze]) || @default_message_key

        records_by_topic[topic] ||= 0
        bytes_by_topic[topic] ||= 0

        record_buf = @formatter_proc.call(tag, time, record)
        record_buf_bytes = record_buf.bytesize
        if @max_send_limit_bytes && record_buf_bytes > @max_send_limit_bytes
          log.warn "record size exceeds max_send_limit_bytes. Skip event:", :time => time, :record => record
          next
        end
      rescue StandardError => e
        log.warn "unexpected error during format record. Skip broken event:", :error => e.to_s, :error_class => e.class.to_s, :time => time, :record => record
        next
      end

      if (messages > 0) and (messages_bytes + record_buf_bytes > @kafka_agg_max_bytes) or (@kafka_agg_max_messages && messages >= @kafka_agg_max_messages)
        log.debug { "#{messages} messages send because reaches the limit of batch transmission." }
        deliver_messages(producer, tag)
        messages = 0
        messages_bytes = 0
      end
      log.trace { "message will send to #{topic} with partition_key: #{partition_key}, partition: #{partition}, message_key: #{message_key} and value: #{record_buf}." }
      messages += 1
      producer.produce2(record_buf, topic: topic, key: message_key, partition_key: partition_key, partition: partition)
      messages_bytes += record_buf_bytes

      records_by_topic[topic] += 1
      bytes_by_topic[topic] += record_buf_bytes
    }
    if messages > 0
      log.debug { "#{messages} messages send." }
      deliver_messages(producer, tag)
    end
    log.debug { "(records|bytes) (#{records_by_topic}|#{bytes_by_topic})" }
  end
rescue Exception => e
  log.warn "Send exception occurred: #{e}"
  log.warn "Exception Backtrace : #{e.backtrace.join("\n")}"
  # For safety, refresh client and its producers
  shutdown_producers
  refresh_client(false)
  # Raise exception to retry sendind messages
  raise e
end