This behaviour provides a callback to compute the hash slot for a specific key based on the number of slots (partitions, nodes, ...).

The purpose of this module is to allow users to implement a custom hash-slot function to distribute the keys. It can be used to select the node/slot where a specific key is supposed to be.

It is highly recommended to use a Consistent Hashing algorithm.

example

Example

defmodule MyApp.Keyslot do
  use Nebulex.Adapter.Keyslot

  @impl true
  def hash_slot(key, range) do
    key
    |> :erlang.phash2()
    |> :jchash.compute(range)
  end
end

This example uses Jumping Consistent Hash.