com.netflix.fenzo

Interface VMTaskFitnessCalculator

All Known Implementing Classes:

DefaultFitnessCalculator

public interface VMTaskFitnessCalculator

Interface representing a task fitness calculator, or scheduling optimization plugin. A task may fit on multiple hosts. Use a fitness calculator to determine how well a task fits on a particular host given the current state of task assignments and running tasks throughout the system.

Method Summary

Modifier and Type	Method and Description
double	calculateFitness(TaskRequest taskRequest, VirtualMachineCurrentState targetVM, TaskTrackerState taskTrackerState) Calculates how well the task fits on the host.
java.lang.String	getName() Get the name of this fitness calculator.

Method Detail

getName

java.lang.String getName()

Get the name of this fitness calculator.

Returns:

Name of the fitness calculator.

calculateFitness

double calculateFitness(TaskRequest taskRequest,
                        VirtualMachineCurrentState targetVM,
                        TaskTrackerState taskTrackerState)

Calculates how well the task fits on the host. This method does not have to check to see that the proposed host has sufficient resources for the proposed task. It can assume that this has already been done.

Parameters:

taskRequest - the task whose resource requirements can be met by the Virtual Machine

targetVM - the prospective target host (VM) for given taskRequest

taskTrackerState - state of the task tracker that contains all tasks currently running and assigned

Returns:

a value between 0.0 and 1.0, with higher values representing better fit of the task on the host