Package org.apache.hadoop.hbase.master.balancer

Class SlopFixingCandidateGenerator

java.lang.Object

org.apache.hadoop.hbase.master.balancer.CandidateGenerator

org.apache.hadoop.hbase.master.balancer.RegionPlanConditionalCandidateGenerator

org.apache.hadoop.hbase.master.balancer.SlopFixingCandidateGenerator

@Private
final class SlopFixingCandidateGenerator
extends RegionPlanConditionalCandidateGenerator

A simple candidate generator that attempts to move regions from the most-loaded servers to the least-loaded servers.

Field Summary

Fields

Modifier and Type	Field	Description
private static final org.slf4j.Logger	LOG
private final float	slop

Fields inherited from class org.apache.hadoop.hbase.master.balancer.CandidateGenerator

MAX_WEIGHT

Constructor Summary

Constructors

Constructor	Description
SlopFixingCandidateGenerator(BalancerConditionals balancerConditionals)

Method Summary

Modifier and Type	Method	Description
(package private) BalanceAction	generateCandidate(BalancerClusterState cluster, boolean isWeighing)	Generates a balancing action to appease the conditional.

Methods inherited from class org.apache.hadoop.hbase.master.balancer.RegionPlanConditionalCandidateGenerator

batchMovesAndResetClusterState, clearWeightCache, generate, getBalancerConditionals, getWeight, undoBatchAction, willBeAccepted

Methods inherited from class org.apache.hadoop.hbase.master.balancer.CandidateGenerator

getAction, pickOtherRandomRack, pickOtherRandomServer, pickRandomRack, pickRandomRegion, pickRandomRegions, pickRandomServer

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.slf4j.Logger LOG

slop

private final float slop

Constructor Details

SlopFixingCandidateGenerator

SlopFixingCandidateGenerator(BalancerConditionals balancerConditionals)

Method Details

generateCandidate

BalanceAction generateCandidate(BalancerClusterState cluster,
 boolean isWeighing)

Description copied from class: RegionPlanConditionalCandidateGenerator

Generates a balancing action to appease the conditional.

Specified by:

generateCandidate in class RegionPlanConditionalCandidateGenerator

Parameters:

cluster - Current state of the cluster.

isWeighing - Flag indicating if the generator is being used for weighing.

Returns:

A BalanceAction, or NULL_ACTION if no action is needed.