org.apache.flink.runtime.scheduler

Interface VertexParallelismInformation

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

Modifier and Type	Method and 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	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

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