org.apache.flink.runtime.operators.shipping

类 OutputEmitter<T>

java.lang.Object

org.apache.flink.runtime.operators.shipping.OutputEmitter<T>

类型参数:

T - The type of the element handled by the emitter.

所有已实现的接口:

ChannelSelector<SerializationDelegate<T>>

public class OutputEmitter<T>
extends Object
implements ChannelSelector<SerializationDelegate<T>>

The output emitter decides to which of the possibly multiple output channels a record is sent. It implement routing based on hash-partitioning, broadcasting, round-robin, custom partition functions, etc.

构造器概要

构造器

构造器和说明
OutputEmitter(ShipStrategyType strategy, int indexInSubtaskGroup) Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...)
OutputEmitter(ShipStrategyType strategy, int indexInSubtaskGroup, org.apache.flink.api.common.typeutils.TypeComparator<T> comparator, org.apache.flink.api.common.functions.Partitioner<?> partitioner, org.apache.flink.api.common.distributions.DataDistribution distribution)
OutputEmitter(ShipStrategyType strategy, org.apache.flink.api.common.typeutils.TypeComparator<T> comparator) Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...)

方法概要

限定符和类型	方法和说明
boolean	isBroadcast() Returns whether the channel selector always selects all the output channels.
int	selectChannel(SerializationDelegate<T> record) Returns the logical channel index, to which the given record should be written.
void	setup(int numberOfChannels) Initializes the channel selector with the number of output channels.

从类继承的方法 java.lang.Object

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

构造器详细资料

OutputEmitter

public OutputEmitter(ShipStrategyType strategy,
                     int indexInSubtaskGroup)

Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied task index perform a round robin distribution.

参数:

strategy - The distribution strategy to be used.

OutputEmitter

public OutputEmitter(ShipStrategyType strategy,
                     org.apache.flink.api.common.typeutils.TypeComparator<T> comparator)

Creates a new channel selector that uses the given strategy (broadcasting, partitioning, ...) and uses the supplied comparator to hash / compare records for partitioning them deterministically.

参数:

strategy - The distribution strategy to be used.

comparator - The comparator used to hash / compare the records.

OutputEmitter

public OutputEmitter(ShipStrategyType strategy,
                     int indexInSubtaskGroup,
                     org.apache.flink.api.common.typeutils.TypeComparator<T> comparator,
                     org.apache.flink.api.common.functions.Partitioner<?> partitioner,
                     org.apache.flink.api.common.distributions.DataDistribution distribution)

方法详细资料

setup

public void setup(int numberOfChannels)

从接口复制的说明: ChannelSelector

Initializes the channel selector with the number of output channels.

指定者:

setup 在接口中 ChannelSelector<SerializationDelegate<T>>

参数:

numberOfChannels - the total number of output channels which are attached to respective output gate.

selectChannel

public final int selectChannel(SerializationDelegate<T> record)

从接口复制的说明: ChannelSelector

Returns the logical channel index, to which the given record should be written. It is illegal to call this method for broadcast channel selectors and this method can remain not implemented in that case (for example by throwing UnsupportedOperationException).

指定者:

selectChannel 在接口中 ChannelSelector<SerializationDelegate<T>>

参数:

record - the record to determine the output channels for.

返回:

an integer number which indicates the index of the output channel through which the record shall be forwarded.

isBroadcast

public boolean isBroadcast()

从接口复制的说明: ChannelSelector

Returns whether the channel selector always selects all the output channels.

指定者:

isBroadcast 在接口中 ChannelSelector<SerializationDelegate<T>>

返回:

true if the selector is for broadcast mode.