celery

In celery, what is the appropriate way to pass contextual metadata from sender process to worker when a task is enqueued?

由 六月ゝ 毕业季﹏ 提交于 2020-01-24 09:40:14
问题 When any celery task is enqueued I want to add contextual metadata the worker will be able to use. The following code example works but I would like to have an appropriate celery-style solution. from celery.signals import before_task_publish, task_prerun @before_task_publish.connect def receiver_before_task_publish(sender=None, headers=None, body=None, **kwargs): task_kwags = body[1] metadata = {"foo": "bar"} task_kwags['__metadata__'] = metadata @task_prerun.connect def receiver_task_pre_run

How do you ensure a Celery chord callback gets called with failed subtasks?

由 倖福魔咒の 提交于 2020-01-24 08:15:04
问题 I am using a Chord in Celery to have a callback that gets called when a Group of parallel tasks finish executing. Specifically, I have a group of functions that wrap calls to an external API. I want to wait for all of these to return before I process the results and update my database in the Chord callback. I would like the callback to execute when all of the API calls have finished, regardless of their status. My problem is that the callback function only gets called if none of the group's

How do you ensure a Celery chord callback gets called with failed subtasks?

由 本小妞迷上赌 提交于 2020-01-24 08:13:26
问题 I am using a Chord in Celery to have a callback that gets called when a Group of parallel tasks finish executing. Specifically, I have a group of functions that wrap calls to an external API. I want to wait for all of these to return before I process the results and update my database in the Chord callback. I would like the callback to execute when all of the API calls have finished, regardless of their status. My problem is that the callback function only gets called if none of the group's

Celery, run task once at a specified time

由 我们两清 提交于 2020-01-24 07:26:09
问题 How can I run a celery task at a given time, but only once? I read the documentation and couldn't find any example of this. 回答1: If you insist on using Celery To run a task at a specified time, in Celery you would normally use a periodic task, which conventionally is a recurring task. However, you may create a periodic task with a very specific schedule and condition that happens only once so effectively it runs only once. Unfortunately we can only specify so much, e.g. we can specify hour ,

Celery, kombu and django - import error

由 痞子三分冷 提交于 2020-01-24 04:10:12
问题 I am running an application with django, and I wanted to use celery to make some scheduled tasks. According to the oficial docs, in my settings.py file I set the broker transport BROKER_URL = 'django://' and added kombu.transport.django to installed apps INSTALLED_APPS = ( .... 'kombu.transport.django', ....) However, when I try to sync the database, with python manage.py syncdb , i get the following error: Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from

Django Celery Received unregistered task of type 'appname.tasks.add'

由 半世苍凉 提交于 2020-01-23 01:48:09
问题 Following the documentation and the Demo Django project here https://github.com/celery/celery/tree/3.1/examples/django Project Structure piesup2 | piesup2 | |__init__.py | |celery.py | |settings.py | |urls.py reports |tasks.py |models.py |etc.... My Code piesup2/celery.py from __future__ import absolute_import import os from celery import Celery # set the default Django settings module for the 'celery' program. os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'piesup2.settings') from django

Django配置Celery执行异步和定时任务

由 梦想的初衷 提交于 2020-01-23 00:55:36
Django配置Celery执行异步和定时任务 Celery简介 Celery是一个基于Python开发的简单、灵活且可靠的处理大量消息的分布式系统，并且提供维护的一个工具。支持使用任务队列的方式在分布式机器的进程、线程上执行任务调度。采用生产者-消费者模型。 消息队列 任务队列是一种在线程或分布式机器间分布任务的机制。消息队列的输出是工作的一个单元，称为任务，Worker进程持续监视队列中是否有新的需要处理的新任务。Celery使用消息通信，通常使用中间人(Broker)在客户端和Worker之间联系，通过客户端向队列中添加消息后broker把消息发送给Worker。 使用场景 异步任务：将耗时的操作任务交给Celery去异步执行，比如发送短信、邮件、消息推送、音视频处理等 定时任务：类似于crontab Celery组件 Celery Beat：任务调度器 Beat进程会读取配置文件中的内容，按照定时任务的设置，定期将需要执行的任务发送给任务队列 Celery Worker：消费者 当任务队列中任务的时候，中间人会通知Worker去处理任务，通常一台服务器上运行多个消费者，提高运行效率 Broker：中间人，消息代理 接受生产者发送的任务，将队列中需要处理的任务消息发送给消费者(消息队列) Producer：任务生产者 调用Celery API，函数或者装饰器

Celery Exception Handling

由 穿精又带淫゛_ 提交于 2020-01-22 20:55:17
问题 Suppose i have this task definition: def some_other_foo(input) raise Exception('This is not handled!') return input @app.task( bind=True, max_retries=5, soft_time_limit=20) def some_foo(self, someInput={}): response="" try: response = some_other_foo(someInput) except Exception as exc: self.retry(countdown=5, exc=exc) response="error" return response I have a problem that exception is not handled in some_foo, I get error instead of response="error", task is crashed and i get Traceback that

Python、Django、Celery中文文档分享

由 删除回忆录丶 提交于 2020-01-22 18:09:00
1.Python：链接: https://pan.baidu.com/s/12uzxbI-nMkpF7aMa966bTQ 密码:i1x9 2.Django：链接: https://pan.baidu.com/s/1svQ1wWeDEaIzf6WZ_pAcHQ 密码:jdtv 3.Celery：链接: https://pan.baidu.com/s/1Zat55U-pXoDUjltLRZCN0Q 密码:rrw0 嗯，排版有点差，但是毕竟是免费资源，将就一下吧！ 来源： https://www.cnblogs.com/thescholar/p/12228885.html

OSError: dlopen(libSystem.dylib, 6): image not found

由 荒凉一梦 提交于 2020-01-22 17:25:09
问题 Just updated my Mac to El Capitan 10.11. I am trying to run Django 1.6 with Celery 3.1 and I'm getting this error now: Unhandled exception in thread started by <function wrapper at 0x10f861050> Traceback (most recent call last): File "/Library/Python/2.7/site-packages/django/utils/autoreload.py", line 93, in wrapper fn(*args, **kwargs) File "/Library/Python/2.7/site-packages/django/core/management/commands/runserver.py", line 101, in inner_run self.validate(display_num_errors=True) File "
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