elsa_kafka

2.0.0

Elsa is a full-featured Kafka library written in Elixir and extending the :brod library with additional support from the :kafka_protocol Erlang libraries to provide capabilities not available in :brod.

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elsa_kafka lib elsa partitioner md5.ex

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lib/elsa/partitioner/md5.ex

defmodule Elsa.Partitioner.Md5 do
  @moduledoc """
  Chooses a topic partition based on an md5 hash of the
  supplied value, typically the message content.
  """

  @behaviour Elsa.Partitioner

  def partition(count, key) do
    :crypto.hash(:md5, key)
    |> :binary.bin_to_list()
    |> Enum.sum()
    |> rem(count)
  end
end

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