Package org.apache.flink.streaming.runtime.partitioner

Class RebalancePartitioner<T>

java.lang.Object

org.apache.flink.streaming.runtime.partitioner.StreamPartitioner<T>

org.apache.flink.streaming.runtime.partitioner.RebalancePartitioner<T>

Type Parameters:

T - Type of the elements in the Stream being rebalanced

All Implemented Interfaces:

Serializable, ChannelSelector<SerializationDelegate<StreamRecord<T>>>

@Internal
public class RebalancePartitioner<T>
extends StreamPartitioner<T>

Partitioner that distributes the data equally by cycling through the output channels.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.flink.streaming.runtime.partitioner.StreamPartitioner

numberOfChannels

Constructor Summary

Constructors

Constructor	Description
RebalancePartitioner()

Method Summary

Modifier and Type	Method	Description
StreamPartitioner<T>	copy()
SubtaskStateMapper	getDownstreamSubtaskStateMapper()	Defines the behavior of this partitioner, when downstream rescaled during recovery of in-flight data.
boolean	isPointwise()
int	selectChannel(SerializationDelegate<StreamRecord<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.
String	toString()

Methods inherited from class org.apache.flink.streaming.runtime.partitioner.StreamPartitioner

disableUnalignedCheckpoints, equals, getUpstreamSubtaskStateMapper, hashCode, isBroadcast, isSupportsUnalignedCheckpoint

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RebalancePartitioner

public RebalancePartitioner()

Method Detail

setup

public void setup(int numberOfChannels)

Description copied from interface: ChannelSelector

Initializes the channel selector with the number of output channels.

Specified by:

setup in interface ChannelSelector<T>

Overrides:

setup in class StreamPartitioner<T>

Parameters:

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

selectChannel

public int selectChannel(SerializationDelegate<StreamRecord<T>> record)

Description copied from interface: 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).

Parameters:

record - the record to determine the output channels for.

Returns:

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

getDownstreamSubtaskStateMapper

public SubtaskStateMapper getDownstreamSubtaskStateMapper()

Description copied from class: StreamPartitioner

Defines the behavior of this partitioner, when downstream rescaled during recovery of in-flight data.

Specified by:

getDownstreamSubtaskStateMapper in class StreamPartitioner<T>

copy

public StreamPartitioner<T> copy()

Specified by:

copy in class StreamPartitioner<T>

isPointwise

public boolean isPointwise()

Specified by:

isPointwise in class StreamPartitioner<T>

toString

public String toString()

Overrides:

toString in class Object