Package org.elasticsearch.cluster.routing.allocation.allocator

Class BalancedShardsAllocator.WeightFunction

java.lang.Object

org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.WeightFunction

Enclosing class:

BalancedShardsAllocator

public static class BalancedShardsAllocator.WeightFunction
extends Object

This class is the primary weight function used to create balanced over nodes and shards in the cluster. Currently this function has 3 properties:

• index balance - balance property over shards per index
• shard balance - balance property over shards per cluster

Each of these properties are expressed as factor such that the properties factor defines the relative importance of the property for the weight function. For example if the weight function should calculate the weights only based on a global (shard) balance the index balance can be set to 0.0 and will in turn have no effect on the distribution.

The weight per index is calculated based on the following formula:

• weightindex(node, index) = indexBalance * (node.numShards(index) - avgShardsPerNode(index))
• weightnode(node, index) = shardBalance * (node.numShards() - avgShardsPerNode)

weight(node, index) = weightindex(node, index) + weightnode(node, index)

Constructor Summary

Constructors

Constructor	Description
WeightFunction(float indexBalance, float shardBalance)

Method Summary

Modifier and Type	Method	Description
float	weight(BalancedShardsAllocator.Balancer balancer, org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node, String index)
float	weightShardAdded(BalancedShardsAllocator.Balancer balancer, org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node, String index)
float	weightShardRemoved(BalancedShardsAllocator.Balancer balancer, org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node, String index)

Methods inherited from class java.lang.Object

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

Constructor Detail

WeightFunction

public WeightFunction(float indexBalance,
                      float shardBalance)

Method Detail

weight

public float weight(BalancedShardsAllocator.Balancer balancer,
                    org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node,
                    String index)

weightShardAdded

public float weightShardAdded(BalancedShardsAllocator.Balancer balancer,
                              org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node,
                              String index)

weightShardRemoved

public float weightShardRemoved(BalancedShardsAllocator.Balancer balancer,
                                org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator.ModelNode node,
                                String index)