监督树未能启动
问题描述:
我试图实现类似于this answer中描述的内容,但是当我编译应用程序时,出现如下所示的错误。监督树未能启动
** (Mix) Could not start application workers: Workers.Application.start(:normal, []) returned an error: shutdown: failed to start child: {Workers.UrlSupervisor, 2}
** (EXIT) already started: #PID<0.1034.0>
我不确定我是否内在地做某件事情,我不允许在这里,或者我犯了一个小错误。
对于这里有些方面是主管:
defmodule Workers.Application do
# See http://elixir-lang.org/docs/stable/elixir/Application.html
# for more information on OTP Applications
@moduledoc false
use Application
def start(_type, _args) do
import Supervisor.Spec, warn: false
url_workers = 1..100 |> Enum.map(fn (i) -> supervisor(Workers.UrlSupervisor, [i], [id: {Workers.UrlSupervisor, i}, restart: :temporary]) end)
domain_workers = 1..100 |> Enum.map(fn (i) -> supervisor(Workers.DomainSupervisor, [i], [id: {Workers.DomainSupervisor, i}, restart: :temporary]) end)
opts = [strategy: :one_for_one, name: Workers.Supervisor]
Supervisor.start_link(url_workers ++ domain_workers, opts)
end
end
defmodule Workers.UrlSupervisor do
def start_link(id) do
import Supervisor.Spec, warn: false
children = [worker(Task, [&Workers.Url.worker/0], [id: {Workers.Url, id}, restart: :permanent])]
opts = [strategy: :one_for_one, name: Workers.UrlSupervisor]
Supervisor.start_link(children, opts)
end
end
defmodule Workers.DomainSupervisor do
def start_link(id) do
import Supervisor.Spec, warn: false
children = [worker(Task, [&Workers.Domain.worker/0], [id: {Workers.Domain, id}, restart: :permanent])]
opts = [strategy: :one_for_one, name: Workers.DomainSupervisor]
Supervisor.start_link(children, opts)
end
end
这里是一个工人(他们看起来大致相同)。
defmodule Workers.Domain do
def worker do
case Store.Domains.pop do
:empty ->
IO.puts "[Domain] none found, waiting..."
:timer.sleep(1000)
{crawl_id, domain} ->
IO.puts "[Domains] found a domain to check: #{domain}"
case Core.check_domain(domain) do
:error ->
Utils.insert(crawl_id, domain, false)
:registered ->
Utils.insert(crawl_id, domain, false)
:available ->
Utils.insert(crawl_id, domain, true)
end
end
worker()
end
end
答
在你Workers.Application
启动时Supervisor
S,找你提供独特id
S中,但也应该有独特的name
秒。
尝试增加另一个关键字,像名称::"url_supervisor_#{i}"
:
def start(_type, _args) do
import Supervisor.Spec, warn: false
url_workers = 1..100 |> Enum.map(fn (i) ->
supervisor(Workers.UrlSupervisor, [i],
[id: {Workers.UrlSupervisor, i},
name: :"url_supervisor_#{i}", # Name added here
restart: :temporary])
end)
domain_workers = 1..100 |> Enum.map(fn (i) ->
supervisor(Workers.DomainSupervisor, [i],
[id: {Workers.DomainSupervisor, i},
name: :"domain_supervisor_#{i}", # Name added here
restart: :temporary])
end)
opts = [strategy: :one_for_one, name: Workers.Supervisor]
Supervisor.start_link(url_workers ++ domain_workers, opts)
end
在你的'Workers.Application',开始的时候'Supervisor's,您提供独特'id's,但他们也应该有独特的名。你能否尝试添加另一个关键字,比如'name::“url_supervisor _#{i}”',以及域管理员的类似事情? –
完全解决了它,我的愚蠢错误!如果你把这个做成一个答案,我会接受它:) – Zen
完成。乐意效劳! –