org.apache.flink.runtime.scheduler.adaptive.scalingpolicy

Interface RescalingController

All Known Implementing Classes:

EnforceMinimalIncreaseRescalingController, EnforceParallelismChangeRescalingController

@Internal
public interface RescalingController

Simple policy for controlling the scale up/down behavior of the AdaptiveScheduler.

Method Summary

Modifier and Type	Method and Description
boolean	shouldRescale(VertexParallelism currentParallelism, VertexParallelism newParallelism) This method gets called whenever new resources or resource requirements are available and the scheduler needs to design whether to rescale or not.

Method Detail

shouldRescale

boolean shouldRescale(VertexParallelism currentParallelism,
                      VertexParallelism newParallelism)

This method gets called whenever new resources or resource requirements are available and the scheduler needs to design whether to rescale or not.

Parameters:

currentParallelism - parallelism of the currently running job graph.

newParallelism - Potential new parallelism with the additional resources.

Returns:

true if the policy decided to rescale based on the provided information.