DB Ownership process error running phoenix test in containerized elixir 1.6.1

Hey there guys,

I have an umbrella project compose by:

  • gateway - Phoenix application
  • core - business model layer
  • notifications - a dedicated app for delivering sms, email, etc…
  • users - user management, role system and authentication.

The three components are connected via amqp, so they can send and receive messages between them.

We are using Docker, and drone.io hosted on google cloud’s kubernetes engine. So, what is happening is that randomly the application raises the following exception while running my tests:

{\"status\":\"error\",\"message\":\"%DBConnection.OwnershipError{message: \\\"cannot find ownership process for #PID<0.716.0>.\\\\n\\\\nWhen using ownership, you must manage connections in one\\\\nof the four ways:\\\\n\\\\n* By explicitly checking out a connection\\\\n* By explicitly allowing a spawned process\\\\n* By running the pool in shared mode\\\\n* By using :caller option with allowed process\\\\n\\\\nThe first two options require every new process to explicitly\\\\ncheck a connection out or be allowed by calling checkout or\\\\nallow respectively.\\\\n\\\\nThe third option requires a {:shared, pid} mode to be set.\\\\nIf using shared mode in tests, make sure your tests are not\\\\nasync.\\\\n\\\\nThe fourth option requires [caller: pid] to be used when\\\\nchecking out a connection from the pool. The caller process\\\\nshould already be allowed on a connection.\\\\n\\\\nIf you are reading this error, it means you have not done one\\\\nof the steps above or that the owner process has crashed.\\\\n\\\\nSee Ecto.Adapters.SQL.Sandbox docs for more information.\\\"}\",\"code\":0}"

It’s a Json since we exchange amqp messages in our tests, for instance:

# Given the module FindUserByEmail
def Users.Services.FindUserByEmail do  
	use GenAMQP.Server, event: "find_user_by_email", conn_name: Application.get_env(:gen_amqp, :conn_name)

  alias User.Repo
  alias User.Models.User, as: UserModel

  def execute(payload) do
    %{ "email" => email } = Poison.decode!(payload)

		resp =
		  case Repo.get_by(UserModel, email: email) do
			%UserModel{} = user -> %{status: :ok, response: user}
		    nil -> ErrorHelper.err(2011)
		    true -> ErrorHelper.err(2012)
		    {:error, %Ecto.Changeset{} = changeset} -> ViewHelper.translate_errors(changeset)

    {:reply, Poison.encode!(resp)}

# and the test
defmodule Users.Services.FindUserByEmailTest do
  use User.ModelCase
  alias GenAMQP.Client

	def execute(payload) do
		resp = Client.call_with_conn(@conn_name, "find_user_by_email", payload)
		data = Poison.decode!(resp, keys: :atoms)

		assert data.status == "ok"

Following details my .drone.yaml file:

   image: bitwalker/alpine-elixir-phoenix:1.6.1
     RABBITCONN: amqp://user:pass@localhost:0000/unit_testing
     DATABASE_URL: ecto://username:password@postgres/testing
     - mix local.hex --force && mix local.rebar --force
     - mix deps.get
     - mix compile --force
     - mix test

mix.exs file in every app contains the following alias

defp aliases do
      "test": ["ecto.create", "ecto.migrate", "test"]

All ours model_case files contain this configuration:

  setup tags do
    :ok = Sandbox.checkout(User.Repo)

    unless tags[:async] do
      Sandbox.mode(User.Repo, {:shared, self()})

How can I debug this? it only occurs while testing code inside the container. Would the issue be related to container’s resources?


I have same issue