VertexParallelismInformation (Flink : Runtime 2.1.1 API)

All Known Implementing Classes:

DefaultVertexParallelismInfo
```
public interface VertexParallelismInformation
```
Manages the parallelism properties for a vertex in the execution graph, as well as how they can change during runtime.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`canRescaleMaxParallelism(int desiredMaxParallelism)`	Returns whether the vertex's max parallelism can be changed to a given value.
`int`	`getMaxParallelism()`	Returns the vertex's max parallelism.
`int`	`getMinParallelism()`	Returns a vertex's min parallelism.
`int`	`getParallelism()`	Returns a vertex's parallelism.
`void`	`setMaxParallelism(int maxParallelism)`	Changes a given vertex's max parallelism property.
`void`	`setParallelism(int parallelism)`	Set a given vertex's parallelism property.

- Method Detail
  - getMinParallelism
```
int getMinParallelism()
```
    Returns a vertex's min parallelism.
    
    Returns:
    
    the min parallelism for the vertex
  - getParallelism
```
int getParallelism()
```
    Returns a vertex's parallelism.
    
    Returns:
    
    the parallelism for the vertex
  - getMaxParallelism
```
int getMaxParallelism()
```
    Returns the vertex's max parallelism.
    
    Returns:
    
    the max parallelism for the vertex
  - setParallelism
```
void setParallelism(int parallelism)
```
    Set a given vertex's parallelism property. The parallelism can be changed only if the vertex parallelism was not decided yet (i.e. was -1).
    
    Parameters:
    
    parallelism - the parallelism for the vertex
  - setMaxParallelism
```
void setMaxParallelism(int maxParallelism)
```
    Changes a given vertex's max parallelism property. The caller should first check the validity of the new setting via canRescaleMaxParallelism(int), otherwise this operation may fail.
    
    Parameters:
    
    maxParallelism - the new max parallelism for the vertex
  - canRescaleMaxParallelism
```
boolean canRescaleMaxParallelism(int desiredMaxParallelism)
```
    Returns whether the vertex's max parallelism can be changed to a given value.
    
    Parameters:
    
    desiredMaxParallelism - the desired max parallelism for the vertex
    
    Returns:
    
    whether the max parallelism can be changed to the given value