RoundRobinOperatorStateRepartitioner (Flink : Runtime 2.0.0 API)

java.lang.Object
- org.apache.flink.runtime.checkpoint.RoundRobinOperatorStateRepartitioner

All Implemented Interfaces:

OperatorStateRepartitioner<OperatorStateHandle>
```
@Internal
public class RoundRobinOperatorStateRepartitioner
extends Object
implements OperatorStateRepartitioner<OperatorStateHandle>
```
Current default implementation of OperatorStateRepartitioner that redistributes state in round robin fashion.

Field Summary

Fields
Modifier and Type Field Description

static OperatorStateRepartitioner<OperatorStateHandle> INSTANCE

Constructor Summary

Constructors
Constructor Description

RoundRobinOperatorStateRepartitioner()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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<OperatorStateHandle> 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<OperatorStateHandle>
    
    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.