Package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies

Class DominantResourceFairnessPolicy.DominantResourceFairnessComparator

java.lang.Object

org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.DominantResourceFairnessPolicy.DominantResourceFairnessComparator

All Implemented Interfaces:

Comparator<Schedulable>

Enclosing class:

DominantResourceFairnessPolicy

public abstract static class DominantResourceFairnessPolicy.DominantResourceFairnessComparator
extends Object
implements Comparator<Schedulable>

This class compares two Schedulable instances according to the DRF policy. If neither instance is below min share, approximate fair share ratios are compared. Subclasses of this class will do the actual work of the comparison, specialized for the number of configured resource types.

Field Summary

Fields

Modifier and Type	Field	Description
protected FSContext	fsContext

Constructor Summary

Constructors

Constructor	Description
DominantResourceFairnessComparator()

Method Summary

Modifier and Type	Method	Description
protected int	compareAttributes(Schedulable s1, Schedulable s2)	This method is used when apps are tied in fairness ratio.
void	setFSContext(FSContext fsContext)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

compare, equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Details

fsContext

protected FSContext fsContext

Constructor Details

DominantResourceFairnessComparator

public DominantResourceFairnessComparator()

Method Details

setFSContext

public void setFSContext(FSContext fsContext)

compareAttributes

protected int compareAttributes(Schedulable s1,
 Schedulable s2)

This method is used when apps are tied in fairness ratio. It breaks the tie by submit time and job name to get a deterministic ordering, which is useful for unit tests.

Parameters:

s1 - the first item to compare

s2 - the second item to compare

Returns:

< 0, 0, or > 0 if the first item is less than, equal to, or greater than the second item, respectively