Class: Kafka::TransactionManager

Inherits:
Object
  • Object
show all
Defined in:
lib/kafka/transaction_manager.rb

Constant Summary collapse

DEFAULT_TRANSACTION_TIMEOUT =

60 seconds

60
TRANSACTION_RESULT_COMMIT = 
true
TRANSACTION_RESULT_ABORT = 
false

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cluster:, logger:, idempotent: false, transactional: false, transactional_id: nil, transactional_timeout: DEFAULT_TRANSACTION_TIMEOUT) ⇒ TransactionManager

Returns a new instance of TransactionManager.



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# File 'lib/kafka/transaction_manager.rb', line 13

def initialize(
  cluster:,
  logger:,
  idempotent: false,
  transactional: false,
  transactional_id: nil,
  transactional_timeout: DEFAULT_TRANSACTION_TIMEOUT
)
  @cluster = cluster
  @logger = TaggedLogger.new(logger)

  @transactional = transactional
  @transactional_id = transactional_id
  @transactional_timeout = transactional_timeout
  @transaction_state = Kafka::TransactionStateMachine.new(logger: logger)
  @transaction_partitions = {}

  # If transactional mode is enabled, idempotent must be enabled
  @idempotent = transactional || idempotent

  @producer_id = -1
  @producer_epoch = 0

  @sequences = {}
end

Instance Attribute Details

#producer_epoch ⇒ Object (readonly)

Returns the value of attribute producer_epoch.



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# File 'lib/kafka/transaction_manager.rb', line 11

def producer_epoch
  @producer_epoch
end

#producer_id ⇒ Object (readonly)

Returns the value of attribute producer_id.



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# File 'lib/kafka/transaction_manager.rb', line 11

def producer_id
  @producer_id
end

#transactional_id ⇒ Object (readonly)

Returns the value of attribute transactional_id.



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# File 'lib/kafka/transaction_manager.rb', line 11

def transactional_id
  @transactional_id
end

Instance Method Details

#abort_transaction ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 186

def abort_transaction
  force_transactional!

  if @transaction_state.aborting_transaction?
    @logger.warn("Transaction is being aborted")
    return
  end

  unless @transaction_state.in_transaction?
    raise 'Transaction is not valid to abort'
  end

  @transaction_state.transition_to!(TransactionStateMachine::ABORTING_TRANSACTION)

  @logger.info "Aborting transaction #{@transactional_id}, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"

  response = transaction_coordinator.end_txn(
    transactional_id: @transactional_id,
    producer_id: @producer_id,
    producer_epoch: @producer_epoch,
    transaction_result: TRANSACTION_RESULT_ABORT
  )
  Protocol.handle_error(response.error_code)

  @logger.info "Transaction #{@transactional_id} is aborted, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"

  complete_transaction

  nil
rescue
  @transaction_state.transition_to!(TransactionStateMachine::ERROR)
  raise
end

#add_partitions_to_transaction(topic_partitions) ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 94

def add_partitions_to_transaction(topic_partitions)
  force_transactional!

  if @transaction_state.uninitialized?
    raise 'Transaction is uninitialized'
  end

  # Extract newly created partitions
  new_topic_partitions = {}
  topic_partitions.each do |topic, partitions|
    partitions.each do |partition|
      @transaction_partitions[topic] ||= {}
      if !@transaction_partitions[topic][partition]
        new_topic_partitions[topic] ||= []
        new_topic_partitions[topic] << partition

        @logger.info "Adding parition #{topic}/#{partition}  to transaction #{@transactional_id}, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"
      end
    end
  end

  unless new_topic_partitions.empty?
    response = transaction_coordinator.add_partitions_to_txn(
      transactional_id: @transactional_id,
      producer_id: @producer_id,
      producer_epoch: @producer_epoch,
      topics: new_topic_partitions
    )

    # Update added topic partitions
    response.errors.each do |tp|
      tp.partitions.each do |p|
        Protocol.handle_error(p.error_code)
        @transaction_partitions[tp.topic] ||= {}
        @transaction_partitions[tp.topic][p.partition] = true
      end
    end
  end

  nil
rescue
  @transaction_state.transition_to!(TransactionStateMachine::ERROR)
  raise
end

#begin_transaction ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 139

def begin_transaction
  force_transactional!
  raise 'Transaction has already started' if @transaction_state.in_transaction?
  raise 'Transaction is not ready' unless @transaction_state.ready?
  @transaction_state.transition_to!(TransactionStateMachine::IN_TRANSACTION)

  @logger.info "Begin transaction #{@transactional_id}, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"

  nil
rescue
  @transaction_state.transition_to!(TransactionStateMachine::ERROR)
  raise
end

#close ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 228

def close
  if in_transaction?
    @logger.warn("Aborting pending transaction ...")
    abort_transaction
  elsif @transaction_state.aborting_transaction? || @transaction_state.committing_transaction?
    @logger.warn("Transaction is finishing. Sleeping until finish!")
    sleep 5
  end
end

#commit_transaction ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 153

def commit_transaction
  force_transactional!

  if @transaction_state.committing_transaction?
    @logger.warn("Transaction is being committed")
    return
  end

  unless @transaction_state.in_transaction?
    raise 'Transaction is not valid to commit'
  end

  @transaction_state.transition_to!(TransactionStateMachine::COMMITTING_TRANSACTION)

  @logger.info "Commiting transaction #{@transactional_id}, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"

  response = transaction_coordinator.end_txn(
    transactional_id: @transactional_id,
    producer_id: @producer_id,
    producer_epoch: @producer_epoch,
    transaction_result: TRANSACTION_RESULT_COMMIT
  )
  Protocol.handle_error(response.error_code)

  @logger.info "Transaction #{@transactional_id} is committed, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"
  complete_transaction

  nil
rescue
  @transaction_state.transition_to!(TransactionStateMachine::ERROR)
  raise
end

#error? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kafka/transaction_manager.rb', line 224

def error?
  @transaction_state.error?
end

#idempotent? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kafka/transaction_manager.rb', line 39

def idempotent?
  @idempotent == true
end

#in_transaction? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kafka/transaction_manager.rb', line 220

def in_transaction?
  @transaction_state.in_transaction?
end

#init_producer_id(force = false) ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 47

def init_producer_id(force = false)
  return if @producer_id >= 0 && !force

  response = transaction_coordinator.init_producer_id(
    transactional_id: @transactional_id,
    transactional_timeout: @transactional_timeout
  )
  Protocol.handle_error(response.error_code)

  # Reset producer id
  @producer_id = response.producer_id
  @producer_epoch = response.producer_epoch

  # Reset sequence
  @sequences = {}

  @logger.debug "Current Producer ID is #{@producer_id} and Producer Epoch is #{@producer_epoch}"
end

#init_transactions ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 76

def init_transactions
  force_transactional!
  unless @transaction_state.uninitialized?
    @logger.warn("Transaction already initialized!")
    return
  end
  init_producer_id(true)
  @transaction_partitions = {}
  @transaction_state.transition_to!(TransactionStateMachine::READY)

  @logger.info "Transaction #{@transactional_id} is initialized, Producer ID: #{@producer_id} (Epoch #{@producer_epoch})"

  nil
rescue
  @transaction_state.transition_to!(TransactionStateMachine::ERROR)
  raise
end

#next_sequence_for(topic, partition) ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 66

def next_sequence_for(topic, partition)
  @sequences[topic] ||= {}
  @sequences[topic][partition] ||= 0
end

#transactional? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kafka/transaction_manager.rb', line 43

def transactional?
  @transactional == true && !@transactional_id.nil?
end

#update_sequence_for(topic, partition, sequence) ⇒ Object 



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# File 'lib/kafka/transaction_manager.rb', line 71

def update_sequence_for(topic, partition, sequence)
  @sequences[topic] ||= {}
  @sequences[topic][partition] = sequence
end