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

Class BufferWritingResultPartition

java.lang.Object

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

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

All Implemented Interfaces:

AutoCloseable, AvailabilityProvider, ResultPartitionWriter

Direct Known Subclasses:

BoundedBlockingResultPartition, PipelinedResultPartition

public abstract class BufferWritingResultPartition
extends ResultPartition

A ResultPartition which writes buffers directly to ResultSubpartitions. This is in contrast to implementations where records are written to a joint structure, from which the subpartitions draw the data after the write phase is finished, for example the sort-based partitioning.

To avoid confusion: On the read side, all subpartitions return buffers (and backlog) to be transported through the network.

Nested Class Summary

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

AvailabilityProvider.AvailabilityHelper

Field Summary

Fields

Modifier and Type	Field	Description
protected final ResultSubpartition[]	subpartitions	The subpartitions of this partition.

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

bufferCompressor, bufferPool, LOG, numBuffersOut, numBytesOut, numSubpartitions, partitionId, partitionManager, partitionType, resultPartitionBytes

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

AVAILABLE

Constructor Summary

Constructors

Constructor	Description
BufferWritingResultPartition(String owningTaskName, int partitionIndex, ResultPartitionID partitionId, ResultPartitionType partitionType, ResultSubpartition[] subpartitions, int numTargetKeyGroups, ResultPartitionManager partitionManager, BufferCompressor bufferCompressor, org.apache.flink.util.function.SupplierWithException<BufferPool,IOException> bufferPoolFactory)

Method Summary

Modifier and Type	Method	Description
void	abortCheckpoint(long checkpointId, CheckpointException cause)	Abort the checkpoint.
protected int	addToSubpartition(int targetSubpartition, BufferConsumer bufferConsumer, int partialRecordLength)
void	alignedBarrierTimeout(long checkpointId)	Timeout the aligned barrier to unaligned barrier.
void	broadcastEvent(AbstractEvent event, boolean isPriorityEvent)	Writes the given AbstractEvent to all subpartitions.
void	broadcastRecord(ByteBuffer record)	Writes the given serialized record to all subpartitions.
void	close()	Closes the partition writer which releases the allocated resource, for example the buffer pool.
protected ResultSubpartitionView	createSubpartitionView(int subpartitionIndex, BufferAvailabilityListener availabilityListener)	Returns a reader for the subpartition with the given index.
void	emitRecord(ByteBuffer record, int targetSubpartition)	Writes the given serialized record to the target subpartition.
void	finish()	Finishes the result partition.
protected void	flushAllSubpartitions(boolean finishProducers)
protected void	flushSubpartition(int targetSubpartition, boolean finishProducers)
ResultSubpartition[]	getAllPartitions()
TimerGauge	getHardBackPressuredTimeMsPerSecond()
int	getNumberOfQueuedBuffers()	Returns the total number of queued buffers of all subpartitions.
int	getNumberOfQueuedBuffers(int targetSubpartition)	Returns the number of queued buffers of the given target subpartition.
long	getSizeOfQueuedBuffersUnsafe()	Returns the total size in bytes of queued buffers of all subpartitions.
protected void	releaseInternal()	Releases all produced data including both those stored in memory and persisted on disk.
void	setMetricGroup(TaskIOMetricGroup metrics)	Sets the metric group for the ResultPartitionWriter.
protected void	setupInternal()	Do the subclass's own setup operation.

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

canBeCompressed, checkInProduceState, createSubpartitionView, fail, getAllDataProcessedFuture, getAvailableFuture, getBufferPool, getFailureCause, getNumberOfSubpartitions, getNumTargetKeyGroups, getOwningTaskName, getPartitionId, getPartitionIndex, getPartitionManager, getPartitionType, getResultPartitionBytes, isFinished, isNumberOfPartitionConsumerUndefined, isNumberOfPartitionConsumerUndefined, isReleased, notifyEndOfData, onSubpartitionAllDataProcessed, release, release, setMaxOverdraftBuffersPerGate, setup, toString

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

Methods inherited from interface org.apache.flink.runtime.io.network.api.writer.ResultPartitionWriter

flush, flushAll

Field Details

subpartitions

protected final ResultSubpartition[] subpartitions

The subpartitions of this partition. At least one.

Constructor Details

BufferWritingResultPartition

public BufferWritingResultPartition(String owningTaskName,
 int partitionIndex,
 ResultPartitionID partitionId,
 ResultPartitionType partitionType,
 ResultSubpartition[] subpartitions,
 int numTargetKeyGroups,
 ResultPartitionManager partitionManager,
 @Nullable
 BufferCompressor bufferCompressor,
 org.apache.flink.util.function.SupplierWithException<BufferPool,IOException> bufferPoolFactory)

Method Details

setupInternal

protected void setupInternal()
                      throws IOException

Description copied from class: ResultPartition

Do the subclass's own setup operation.

Specified by:

setupInternal in class ResultPartition

Throws:

IOException

getNumberOfQueuedBuffers

public int getNumberOfQueuedBuffers()

Description copied from class: ResultPartition

Returns the total number of queued buffers of all subpartitions.

Specified by:

getNumberOfQueuedBuffers in class ResultPartition

getSizeOfQueuedBuffersUnsafe

public long getSizeOfQueuedBuffersUnsafe()

Description copied from class: ResultPartition

Returns the total size in bytes of queued buffers of all subpartitions.

Specified by:

getSizeOfQueuedBuffersUnsafe in class ResultPartition

getNumberOfQueuedBuffers

public int getNumberOfQueuedBuffers(int targetSubpartition)

Description copied from class: ResultPartition

Returns the number of queued buffers of the given target subpartition.

Specified by:

getNumberOfQueuedBuffers in class ResultPartition

flushSubpartition

protected void flushSubpartition(int targetSubpartition,
 boolean finishProducers)

flushAllSubpartitions

protected void flushAllSubpartitions(boolean finishProducers)

emitRecord

public void emitRecord(ByteBuffer record,
 int targetSubpartition)
                throws IOException

Description copied from interface: ResultPartitionWriter

Writes the given serialized record to the target subpartition.

Throws:

IOException

broadcastRecord

public void broadcastRecord(ByteBuffer record)
                     throws IOException

Description copied from interface: ResultPartitionWriter

Writes the given serialized record to all subpartitions. One can also achieve the same effect by emitting the same record to all subpartitions one by one, however, this method can have better performance for the underlying implementation can do some optimizations, for example coping the given serialized record only once to a shared channel which can be consumed by all subpartitions.

Throws:

IOException

broadcastEvent

public void broadcastEvent(AbstractEvent event,
 boolean isPriorityEvent)
                    throws IOException

Description copied from interface: ResultPartitionWriter

Writes the given AbstractEvent to all subpartitions.

Throws:

IOException

alignedBarrierTimeout

public void alignedBarrierTimeout(long checkpointId)
                           throws IOException

Description copied from interface: ResultPartitionWriter

Timeout the aligned barrier to unaligned barrier.

Throws:

IOException

abortCheckpoint

public void abortCheckpoint(long checkpointId,
 CheckpointException cause)

Description copied from interface: ResultPartitionWriter

Abort the checkpoint.

setMetricGroup

public void setMetricGroup(TaskIOMetricGroup metrics)

Description copied from interface: ResultPartitionWriter

Sets the metric group for the ResultPartitionWriter.

Specified by:

setMetricGroup in interface ResultPartitionWriter

Overrides:

setMetricGroup in class ResultPartition

createSubpartitionView

protected ResultSubpartitionView createSubpartitionView(int subpartitionIndex,
 BufferAvailabilityListener availabilityListener)
                                                 throws IOException

Description copied from class: ResultPartition

Returns a reader for the subpartition with the given index.

Given that the function to merge outputs from multiple subpartition views is supported uniformly in UnionResultSubpartitionView, subclasses of ResultPartition only needs to take care of creating subpartition view for a single subpartition.

Specified by:

createSubpartitionView in class ResultPartition

Throws:

IOException

finish

public void finish()
            throws IOException

Description copied from class: ResultPartition

Finishes the result partition.

After this operation, it is not possible to add further data to the result partition.

For BLOCKING results, this will trigger the deployment of consuming tasks.

Specified by:

finish in interface ResultPartitionWriter

Overrides:

finish in class ResultPartition

Throws:

IOException

releaseInternal

protected void releaseInternal()

Description copied from class: ResultPartition

Releases all produced data including both those stored in memory and persisted on disk.

Specified by:

releaseInternal in class ResultPartition

close

public void close()

Description copied from interface: ResultPartitionWriter

Closes the partition writer which releases the allocated resource, for example the buffer pool.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface ResultPartitionWriter

Overrides:

close in class ResultPartition

addToSubpartition

protected int addToSubpartition(int targetSubpartition,
 BufferConsumer bufferConsumer,
 int partialRecordLength)
                         throws IOException

Throws:

IOException

getHardBackPressuredTimeMsPerSecond

@VisibleForTesting
public TimerGauge getHardBackPressuredTimeMsPerSecond()

getAllPartitions

@VisibleForTesting
public ResultSubpartition[] getAllPartitions()