org.apache.flink.runtime.checkpoint

Class RoundRobinOperatorStateRepartitioner

java.lang.Object

org.apache.flink.runtime.checkpoint.RoundRobinOperatorStateRepartitioner

All Implemented Interfaces:

OperatorStateRepartitioner

@Internal
public class RoundRobinOperatorStateRepartitioner
extends Object
implements OperatorStateRepartitioner

Current default implementation of OperatorStateRepartitioner that redistributes state in round robin fashion.

Field Summary

Fields

Modifier and Type	Field and Description
static OperatorStateRepartitioner	INSTANCE

Constructor Summary

Constructors

Constructor and Description
RoundRobinOperatorStateRepartitioner()

Method Summary

Modifier and Type	Method and Description
List<List<OperatorStateHandle>>	repartitionState(List<List<OperatorStateHandle>> previousParallelSubtaskStates, int oldParallelism, int newParallelism)

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final OperatorStateRepartitioner INSTANCE

Constructor Detail

RoundRobinOperatorStateRepartitioner

public RoundRobinOperatorStateRepartitioner()

Method Detail

repartitionState

public List<List<OperatorStateHandle>> repartitionState(List<List<OperatorStateHandle>> previousParallelSubtaskStates,
                                                        int oldParallelism,
                                                        int newParallelism)

Specified by:

repartitionState in interface OperatorStateRepartitioner

Parameters:

previousParallelSubtaskStates - List with one entry of state handles per parallel subtask of an operator, as they have been checkpointed.

oldParallelism - The parallelism before we start redistribution.

newParallelism - The parallelism that we consider for the state redistribution. Determines the size of the returned list.

Returns:

List with one entry per parallel subtask. Each subtask receives now one collection of states that build of the new total state for this subtask.