Class: Kafka::Group

Inherits:
Object
  • Object
show all
Defined in:
lib/jruby-kafka/group.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Group

Create a Kafka client group

options: :zk_connect => “localhost:2181” - REQUIRED: The connection string for the

zookeeper connection in the form host:port. Multiple URLS can be given to allow fail-over.

:zk_connect_timeout => “6000” - (optional) The max time that the client waits while establishing a connection to zookeeper. :group_id => “group” - REQUIRED: The group id to consume on. :topic_id => “topic” - REQUIRED: The topic id to consume on. :reset_beginning => “from-beginning” - (optional) If the consumer does not already have an established offset

to consume from, start with the earliest message present in the log rather than the latest message.

:consumer_restart_on_error => “true” - (optional) Controls if consumer threads are to restart on caught exceptions.

exceptions are logged.



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# File 'lib/jruby-kafka/group.rb', line 33

def initialize(options={})
  validate_required_arguments(options)

  @zk_connect = options[:zk_connect]
  @group_id = options[:group_id]
  @topic = options[:topic_id]
  @zk_session_timeout = '6000'
  @zk_connect_timeout = '6000'
  @zk_sync_time = '2000'
  @auto_offset_reset = 'largest'
  @auto_commit_interval = '1000'
  @running = false
  @rebalance_max_retries = '4'
  @rebalance_backoff_ms = '2000'
  @socket_timeout_ms = "#{30 * 1000}"
  @socket_receive_buffer_bytes = "#{64 * 1024}"
  @fetch_message_max_bytes = "#{1024 * 1024}"
  @auto_commit_enable = "#{true}"
  @queued_max_message_chunks = '10'
  @fetch_min_bytes = '1'
  @fetch_wait_max_ms = '100'
  @refresh_leader_backoff_ms = '200'
  @consumer_timeout_ms = '-1'
  @consumer_restart_on_error = "#{true}"
  @consumer_restart_sleep_ms = '2000'

  if options[:zk_connect_timeout]
    @zk_connect_timeout = options[:zk_connect_timeout]
  end
  if options[:zk_session_timeout]
    @zk_session_timeout = options[:zk_session_timeout]
  end
  if options[:zk_sync_time]
    @zk_sync_time = options[:zk_sync_time]
  end
  if options[:auto_commit_interval]
    @auto_commit_interval = options[:auto_commit_interval]
  end

  if options[:rebalance_max_retries]
    @rebalance_max_retries = options[:rebalance_max_retries]
  end

  if options[:rebalance_backoff_ms]
    @rebalance_backoff_ms = options[:rebalance_backoff_ms]
  end

  if options[:socket_timeout_ms]
    @socket_timeout_ms = options[:socket_timeout_ms]
  end

  if options[:socket_receive_buffer_bytes]
    @socket_receive_buffer_bytes = options[:socket_receive_buffer_bytes]
  end

  if options[:fetch_message_max_bytes]
    @fetch_message_max_bytes = options[:fetch_message_max_bytes]
  end

  if options[:auto_commit_enable]
    @auto_commit_enable = "#{options[:auto_commit_enable]}"
  end

  if options[:queued_max_message_chunks]
    @queued_max_message_chunks = options[:queued_max_message_chunks]
  end

  if options[:fetch_min_bytes]
    @fetch_min_bytes = options[:fetch_min_bytes]
  end

  if options[:fetch_wait_max_ms]
    @fetch_wait_max_ms = options[:fetch_wait_max_ms]
  end

  if options[:refresh_leader_backoff_ms]
    @refresh_leader_backoff_ms = options[:refresh_leader_backoff_ms]
  end

  if options[:consumer_timeout_ms]
    @consumer_timeout_ms = options[:consumer_timeout_ms]
  end

  if options[:consumer_restart_on_error]
    @consumer_restart_on_error = options[:consumer_restart_on_error]
  end

  if options[:consumer_restart_sleep_ms]
    @consumer_restart_sleep_ms = options[:consumer_restart_sleep_ms]
  end


  if options[:reset_beginning]
    if options[:reset_beginning] == 'from-beginning'
      @auto_offset_reset = 'smallest'
    else
      @auto_offset_reset = 'largest'
    end
  end
end

Instance Method Details

#run(a_numThreads, a_queue) ⇒ Object 



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# File 'lib/jruby-kafka/group.rb', line 153

def run(a_numThreads, a_queue)
  begin
    if @auto_offset_reset == 'smallest'
      Java::kafka::utils::ZkUtils.maybeDeletePath(@zk_connect, "/consumers/#{@group_id}")
    end

    @consumer = Java::kafka::consumer::Consumer.createJavaConsumerConnector(createConsumerConfig())
  rescue ZkException => e
    raise KafkaError.new(e), "Got ZkException: #{e}"
  end
  topicCountMap = java.util.HashMap.new()
  thread_value = a_numThreads.to_java Java::int
  topicCountMap.put(@topic, thread_value)
  consumerMap = @consumer.createMessageStreams(topicCountMap)
  streams = Array.new(consumerMap[@topic])

  @executor = Executors.newFixedThreadPool(a_numThreads)
  @executor_submit = @executor.java_method(:submit, [Java::JavaLang::Runnable.java_class])

  threadNumber = 0
  for stream in streams
    @executor_submit.call(Kafka::Consumer.new(stream, threadNumber, a_queue, @consumer_restart_on_error, @consumer_restart_sleep_ms))
    threadNumber += 1
  end
  @running = true
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jruby-kafka/group.rb', line 181

def running?
  @running
end

#shutdown ⇒ Object 



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# File 'lib/jruby-kafka/group.rb', line 142

def shutdown()
  if @consumer
    @consumer.shutdown()
  end
  if @executor
    @executor.shutdown()
  end
  @running = false
end