org.apache.flink.runtime.io.network.partition.consumer

Class UnknownInputChannel

java.lang.Object

org.apache.flink.runtime.io.network.partition.consumer.InputChannel

org.apache.flink.runtime.io.network.partition.consumer.UnknownInputChannel

public class UnknownInputChannel
extends InputChannel

An input channel place holder to be replaced by either a RemoteInputChannel or LocalInputChannel at runtime.

Field Summary

Fields inherited from class org.apache.flink.runtime.io.network.partition.consumer.InputChannel

channelIndex, inputGate, numBytesIn, partitionId

Constructor Summary

Constructors

Constructor and Description
UnknownInputChannel(SingleInputGate gate, int channelIndex, ResultPartitionID partitionId, ResultPartitionManager partitionManager, TaskEventDispatcher taskEventDispatcher, ConnectionManager connectionManager, scala.Tuple2<Integer,Integer> partitionRequestInitialAndMaxBackoff, IOMetricGroup metrics)

Method Summary

Modifier and Type	Method and Description
Buffer	getNextBuffer() Returns the next buffer from the consumed subpartition.
boolean	isReleased() Returns false.
void	notifySubpartitionConsumed()
void	releaseAllResources() Releases all resources of the channel.
void	requestSubpartition(int subpartitionIndex) Requests the queue with the specified index of the source intermediate result partition.
void	sendTaskEvent(TaskEvent event) Sends a TaskEvent back to the task producing the consumed result partition.
LocalInputChannel	toLocalInputChannel()
RemoteInputChannel	toRemoteInputChannel(ConnectionID producerAddress)
String	toString()

Methods inherited from class org.apache.flink.runtime.io.network.partition.consumer.InputChannel

checkError, getCurrentBackoff, increaseBackoff, notifyAvailableBuffer, setError

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

UnknownInputChannel

public UnknownInputChannel(SingleInputGate gate,
                           int channelIndex,
                           ResultPartitionID partitionId,
                           ResultPartitionManager partitionManager,
                           TaskEventDispatcher taskEventDispatcher,
                           ConnectionManager connectionManager,
                           scala.Tuple2<Integer,Integer> partitionRequestInitialAndMaxBackoff,
                           IOMetricGroup metrics)

Method Detail

requestSubpartition

public void requestSubpartition(int subpartitionIndex)
                         throws IOException

Description copied from class: InputChannel

Requests the queue with the specified index of the source intermediate result partition.

The queue index to request depends on which sub task the channel belongs to and is specified by the consumer of this channel.

Throws:

IOException

getNextBuffer

public Buffer getNextBuffer()
                     throws IOException

Description copied from class: InputChannel

Returns the next buffer from the consumed subpartition.

Throws:

IOException

sendTaskEvent

public void sendTaskEvent(TaskEvent event)
                   throws IOException

Description copied from class: InputChannel

Sends a TaskEvent back to the task producing the consumed result partition.

Important: The producing task has to be running to receive backwards events. This means that the result type needs to be pipelined and the task logic has to ensure that the producer will wait for all backwards events. Otherwise, this will lead to an Exception at runtime.

Throws:

IOException

isReleased

public boolean isReleased()

Returns false.

Important: It is important that the method correctly always false for unknown input channels in order to not finish the consumption of an intermediate result partition early in BufferReader.

notifySubpartitionConsumed

public void notifySubpartitionConsumed()

releaseAllResources

public void releaseAllResources()
                         throws IOException

Description copied from class: InputChannel

Releases all resources of the channel.

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

toRemoteInputChannel

public RemoteInputChannel toRemoteInputChannel(ConnectionID producerAddress)

toLocalInputChannel

public LocalInputChannel toLocalInputChannel()