Node Picker Interface.

The purpose of this module is to allow users implement a custom node picker/selector to distribute keys. This interface is used to cherry-pick the node where is supposed the given key remains and then be able to execute the requested operation.

To implement pick_node/2 function, it is highly recommended to use a Consistent Hashing algorithm.

Example

defmodule MyApp.MyNodePicker do
  @behaviour Nebulex.Adapters.Dist.NodePicker

  def pick_node(nodes, key) do
    key
    |> :erlang.phash2()
    |> :jchash.compute(length(nodes))
    |> Kernel.+(1)
    |> :lists.nth(nodes)
  end
end

This example uses Jumping Consistent Hash.