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

Class UnionInputGate

java.lang.Object

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

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

All Implemented Interfaces:

AutoCloseable, AvailabilityProvider, ChannelStateHolder, PullingAsyncDataInput<BufferOrEvent>

public class UnionInputGate
extends InputGate

Input gate wrapper to union the input from multiple input gates.

Each input gate has input channels attached from which it reads data. At each input gate, the input channels have unique IDs from 0 (inclusive) to the number of input channels (exclusive).

 +---+---+      +---+---+---+
 | 0 | 1 |      | 0 | 1 | 2 |
 +--------------+--------------+
 | Input gate 0 | Input gate 1 |
 +--------------+--------------+
 

The union input gate maps these IDs from 0 to the *total* number of input channels across all unioned input gates, e.g. the channels of input gate 0 keep their original indexes and the channel indexes of input gate 1 are set off by 2 to 2--4.

 +---+---++---+---+---+
 | 0 | 1 || 2 | 3 | 4 |
 +--------------------+
 | Union input gate   |
 +--------------------+
 

It is NOT possible to recursively union union input gates.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.runtime.io.network.partition.consumer.InputGate

InputGate.InputWithData<INPUT,DATA>

Nested classes/interfaces inherited from interface org.apache.flink.runtime.io.AvailabilityProvider

AvailabilityProvider.AvailabilityHelper

Nested classes/interfaces inherited from interface org.apache.flink.runtime.io.PullingAsyncDataInput

PullingAsyncDataInput.EndOfDataStatus

Field Summary

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

availabilityHelper, priorityAvailabilityHelper

Fields inherited from interface org.apache.flink.runtime.io.AvailabilityProvider

AVAILABLE

Constructor Summary

Constructors

Constructor	Description
UnionInputGate(IndexedInputGate... inputGates)

Method Summary

Modifier and Type	Method	Description
void	acknowledgeAllRecordsProcessed(InputChannelInfo channelInfo)
void	close()
void	finishReadRecoveredState()
InputChannel	getChannel(int channelIndex)	Returns the channel of this gate.
Optional<BufferOrEvent>	getNext()	Blocking call waiting for next BufferOrEvent.
int	getNumberOfInputChannels()	Returns the total number of input channels across all unioned input gates.
CompletableFuture<Void>	getStateConsumedFuture()
PullingAsyncDataInput.EndOfDataStatus	hasReceivedEndOfData()	Tells if we consumed all available data.
boolean	isFinished()
Optional<BufferOrEvent>	pollNext()	Poll the BufferOrEvent.
void	requestPartitions()
void	resumeConsumption(InputChannelInfo channelInfo)
void	sendTaskEvent(TaskEvent event)
void	setup()	Setup gate, potentially heavy-weight, blocking operation comparing to just creation.
String	toString()

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

getAvailableFuture, getChannelInfos, getPriorityEventAvailableFuture, setChannelStateWriter

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.io.AvailabilityProvider

isApproximatelyAvailable, isAvailable

Constructor Detail

UnionInputGate

public UnionInputGate(IndexedInputGate... inputGates)

Method Detail

getNumberOfInputChannels

public int getNumberOfInputChannels()

Returns the total number of input channels across all unioned input gates.

Specified by:

getNumberOfInputChannels in class InputGate

getChannel

public InputChannel getChannel(int channelIndex)

Description copied from class: InputGate

Returns the channel of this gate.

Specified by:

getChannel in class InputGate

isFinished

public boolean isFinished()

Specified by:

isFinished in interface PullingAsyncDataInput<BufferOrEvent>

Specified by:

isFinished in class InputGate

Returns:

true if is finished and for example end of input was reached, false otherwise.

hasReceivedEndOfData

public PullingAsyncDataInput.EndOfDataStatus hasReceivedEndOfData()

Description copied from interface: PullingAsyncDataInput

Tells if we consumed all available data.

Moreover it tells us the reason why there is no more data incoming. If any of the upstream subtasks finished because of the stop-with-savepoint --no-drain, we should not drain the input. See also StopMode.

getNext

public Optional<BufferOrEvent> getNext()
                                throws IOException,
                                       InterruptedException

Description copied from class: InputGate

Blocking call waiting for next BufferOrEvent.

Note: It should be guaranteed that the previous returned buffer has been recycled before getting next one.

Specified by:

getNext in class InputGate

Returns:

Optional.empty() if InputGate.isFinished() returns true.

Throws:

IOException

InterruptedException

pollNext

public Optional<BufferOrEvent> pollNext()
                                 throws IOException,
                                        InterruptedException

Description copied from class: InputGate

Poll the BufferOrEvent.

Note: It should be guaranteed that the previous returned buffer has been recycled before polling next one.

Specified by:

pollNext in interface PullingAsyncDataInput<BufferOrEvent>

Specified by:

pollNext in class InputGate

Returns:

Optional.empty() if there is no data to return or if InputGate.isFinished() returns true.

Throws:

IOException

InterruptedException

sendTaskEvent

public void sendTaskEvent(TaskEvent event)
                   throws IOException

Specified by:

sendTaskEvent in class InputGate

Throws:

IOException

resumeConsumption

public void resumeConsumption(InputChannelInfo channelInfo)
                       throws IOException

Specified by:

resumeConsumption in class InputGate

Throws:

IOException

acknowledgeAllRecordsProcessed

public void acknowledgeAllRecordsProcessed(InputChannelInfo channelInfo)
                                    throws IOException

Specified by:

acknowledgeAllRecordsProcessed in class InputGate

Throws:

IOException

setup

public void setup()

Description copied from class: InputGate

Setup gate, potentially heavy-weight, blocking operation comparing to just creation.

Specified by:

setup in class InputGate

getStateConsumedFuture

public CompletableFuture<Void> getStateConsumedFuture()

Specified by:

getStateConsumedFuture in class InputGate

requestPartitions

public void requestPartitions()
                       throws IOException

Specified by:

requestPartitions in class InputGate

Throws:

IOException

close

public void close()
           throws IOException

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

finishReadRecoveredState

public void finishReadRecoveredState()
                              throws IOException

Specified by:

finishReadRecoveredState in class InputGate

Throws:

IOException