Class ShardAllocationStrategy

Inheritance

Object

ShardAllocationStrategy

Inherited Members

Object.Equals(Object)

Object.Equals(Object, Object)

Object.GetHashCode()

Object.GetType()

Object.MemberwiseClone()

Object.ReferenceEquals(Object, Object)

Object.ToString()

Namespace: Akka.Cluster.Sharding

Assembly: Akka.Cluster.Sharding.dll

Syntax

public static class ShardAllocationStrategy

Methods

LeastShardAllocationStrategy(Int32, Double)

IShardAllocationStrategy that allocates new shards to the ShardRegion (node) with least number of previously allocated shards.

When a node is added to the cluster the shards on the existing nodes will be rebalanced to the new node. The LeastShardAllocationStrategy(Int32, Double) picks shards for rebalancing from the ShardRegions with most number of previously allocated shards.They will then be allocated to the ShardRegion with least number of previously allocated shards, i.e. new members in the cluster.The amount of shards to rebalance in each round can be limited to make it progress slower since rebalancing too many shards at the same time could result in additional load on the system.For example, causing many Event Sourced entites to be started at the same time.

It will not rebalance when there is already an ongoing rebalance in progress.

Declaration

public static IShardAllocationStrategy LeastShardAllocationStrategy(int absoluteLimit, double relativeLimit)

Parameters

Type	Name	Description
Int32	absoluteLimit	The maximum number of shards that will be rebalanced in one rebalance round
Double	relativeLimit	Fraction (< 1.0) of total number of (known) shards that will be rebalanced in one rebalance round

Returns

Type	Description
IShardAllocationStrategy