Package org.apache.flink.runtime.checkpoint

Class InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor

java.lang.Object

org.apache.flink.runtime.checkpoint.InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor

All Implemented Interfaces:

Serializable

Enclosing class:

InflightDataRescalingDescriptor

public static class InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor
extends Object
implements Serializable

Captures ambiguous mappings of old channels to new channels.

For inputs, this mapping implies the following:

oldSubtaskIndexes is set when there is a rescale on this task potentially leading to different key groups. Upstream task has a corresponding rescaledChannelsMappings where it sends data over virtual channel while specifying the channel index in the VirtualChannelSelector. This subtask then demultiplexes over the virtual subtask index.

rescaledChannelsMappings is set when there is a downscale of the upstream task. Upstream task has a corresponding oldSubtaskIndexes where it sends data over virtual channel while specifying the subtask index in the VirtualChannelSelector. This subtask then demultiplexes over channel indexes.

For outputs, it's vice-versa. The information must be kept in sync but they are used in opposite ways for multiplexing/demultiplexing.

Note that in the common rescaling case both information is set and need to be simultaneously used. If the input subtask subsumes the state of 3 old subtasks and a channel corresponds to 2 old channels, then there are 6 virtual channels to be demultiplexed.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor.MappingType	Type of mapping which should be used for this in-flight data.

Constructor Summary

Constructors

Constructor	Description
InflightDataGateOrPartitionRescalingDescriptor(int[] oldSubtaskIndexes, RescaleMappings rescaledChannelsMappings, Set<Integer> ambiguousSubtaskIndexes, InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor.MappingType mappingType)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
int	hashCode()
boolean	isIdentity()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

InflightDataGateOrPartitionRescalingDescriptor

public InflightDataGateOrPartitionRescalingDescriptor(int[] oldSubtaskIndexes,
 RescaleMappings rescaledChannelsMappings,
 Set<Integer> ambiguousSubtaskIndexes,
 InflightDataRescalingDescriptor.InflightDataGateOrPartitionRescalingDescriptor.MappingType mappingType)

Method Details

isIdentity

public boolean isIdentity()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object