celery

How to start a task only when all other tasks have finished in Celery

℡╲_俬逩灬. 提交于 2019-12-02 09:56:42
In Celery, I want to start a task only when all the other tasks have completed. I found some resources like this one : Celery Starting a Task when Other Tasks have Completed and Running a task after all tasks have been completed But I am quite new to celery and could not really understand the above (or many other resources for that matter). So I have defined a task as so in a tasks.py : @celapp.task() def sampleFun(arg1, arg2, arg3): # do something here and I call it as this : for x in xrange(4): tasks.sampleFun.delay(val1, val2, val3) And I assume that there would be 4 different tasks created

Choose which way to calculate the PV and UV in Django?

谁都会走 提交于 2019-12-02 08:54:38
问题 I'm building a news website using Django and hope this website can handle millions of traffic .Now I'm coding a function that displays 48 hours most viewed articles to readers,so I need calculate the PV. I have searched for a while and asked some people.I know I have some options: 1.using simply click_num=click_num+1,but I know this is the worst way. 2.A better way is using Celery to code a distributed task,but I don't know how to exactly do it. 3.I heard Redis also can used to calculate PV

Python celery简介

 ̄綄美尐妖づ 提交于 2019-12-02 08:50:22
Celery异步分布式 什么是celery? 他是一个python开发的异步分布式任务调度模块 celery本身不提供消息服务,使用第三方服务,也就是broker来传递任务,目前支持rabbitmq,redis,数据库等等。 我们使用redis 连接URL的格式为: redis://:password@hostname:port/db_number 例如: BROKER_URL='redis://localhost:6379/0' 过程如图示 在python里面如果用到异步分布式,首先想到celery 安装celery pip install celery pip install redis #之前讲过 在服务器上安装redis服务器,并启动redis 第一个简单的例子: [root@localhost celery]# cat lili.py #/usr/bin/env python #-*- coding:utf-8 -*- from celery import Celery broker="redis://192.168.48.131:6379/5" backend="redis://192.168.48.131:6379/6" app = Celery("lili", broker=broker, backend=backend) @app.task def add(x,

Celery 入门-简单任务开发

霸气de小男生 提交于 2019-12-02 08:50:10
安装 pip install celery # pip install flower #celery的及时监控组件 配置 默认celery的配置文件名是celeryconfig.py,本例的内容如下: BROKER_URL ='amqp://guest:guest[@localhost](https://my.oschina.net/u/570656):5672' CELERY_ENABLE_UTC = True CELERY_TIMEZONE='Asia/Shanghai' CELERY_IMPORTS = ('celery_demo.tasks','celery_demo.tasks2') # other config option 默认flower的配置文件名是flowerconfig.py,本例的内容如下: broker_api = 'http://guest:guest[@localhost](https://my.oschina.net/u/570656):15672/api/' logging = 'DEBUG' basic_auth = ['admin:admin'] #加上授权保护 address = '127.0.0.1' port = 5556 #开发任务 项目结构如下: ├── celery_demo │ ├── celeryconfig.py │ ├──

Django框架17: Celery的使用

随声附和 提交于 2019-12-02 08:49:57
Celery介绍 1.什么是Celery Celery是一个python模块,它在官网的定义:Celery is asynchronous task queue/job based on distributed message passing. It is focused on real-time operation, but supports scheduling as well. 这里强调的概念包括:异步任务队列,分布式消息传递,实时或调度任务。 2.为什么要使用Celery Celery是一个使用Python开发的分布式任务调度模块,因此对于大量使用Python构建的系统,可以说是无缝衔接,使用起来很方便。Celery专注于实时处理任务,同时也支持任务的定时调度。因此适合实时异步任务定时任务等调度场景。 3.Celery任务队列 任务队列是一种在进程或机器之间分发任务的机制。 任务队列的输入是被称为任务(task)的工作单元。专用的工作进程会时刻监控任务队列,来获取要执行的任务。 celery的client和worker通过消息来“沟通“。Celery需要依靠RabbitMQ等作为消息代理,同时也支持Redis甚至是Mysql,Mongo等,当然,官方默认推荐的是RabbitMQ。 为了开始一个任务,client需要向队列中发送任务消息

Python Celery多实例 定时任务

那年仲夏 提交于 2019-12-02 08:49:45
celery是一个分布式的任务调度模块,那么celery是如何和分布式挂钩呢? celery可以支持多台不同的计算机执行不同的任务或者相同的任务。 如果要说celery的分布式应用的话,就要提到celery的消息路由机制,提到AMQP协议。 具体可以查看AMQP文档详细了解。 简单理解: 可以有多个"消息队列"(message Queue),不同的消息可以指定发送给不同的Message Queue, 而这是通过Exchange来实现的,发送消息到"消息队列"中时,可以指定routiing_key,Exchange通过routing_key来吧消息路由(routes)到不同的"消息队列"中去。 如图: exchange 对应 一个消息队列(queue),即:通过"消息路由"的机制使exchange对应queue,每个queue对应每个worker 写个例子: vim demon3.py from celery import Celery app = Celery() app.config_from_object("celeryconfig") @app.task def taskA(x, y): return x * y @app.task def taskB(x, y, z): return x + y + z @app.task def add(x, y): return x +

Celery

柔情痞子 提交于 2019-12-02 06:57:46
Celery 一 、什么是Clelery Celery是一个简单、灵活且可靠的,处理大量消息的分布式系统专注于实时处理的异步任务队列 同时也支持任务调度 1. Celery架构 Celery 的架构由三部分组成,消息中间件(message broker),任务执行单元(worker)和任务执行结果存储(task result store)组成。 1.2 消息中间件 Celery 本身不提供消息服务,但是可以方便的和第三方提供的消息中间件集成。包括, RabbitMQ , Redis 等等 1.3 任务执行单元 Worker 是 Celery 提供的任务执行的单元, worker 并发的运行在分布式的系统节点中。 1.4 任务结果存储 Task result store 用来存储 Worker 执行的任务的结果, Celery 支持以不同方式存储任务的结果,包括 AMQP , redis 等 1.5版本支持情况 Celery version 4.0 runs on Python ❨2.7, 3.4, 3.5❩ PyPy ❨5.4, 5.5❩ This is the last version to support Python 2.7, and from the next version (Celery 5.x) Python 3.5 or newer is required. If

Celery worker ImportError: No module named 'project'

喜欢而已 提交于 2019-12-02 06:37:40
While I tried to start the worker I got a issue: ImportError: No module named 'project' Traceback (most recent call last): File "/usr/local/bin/celery", line 11, in <module> sys.exit(main()) File "/usr/local/lib/python3.5/dist-packages/celery/__main__.py", line 16, in main _main() File "/usr/local/lib/python3.5/dist-packages/celery/bin/celery.py", line 322, in main cmd.execute_from_commandline(argv) File "/usr/local/lib/python3.5/dist-packages/celery/bin/celery.py", line 496, in execute_from_commandline super(CeleryCommand, self).execute_from_commandline(argv))) File "/usr/local/lib/python3.5

Celery worker ImportError: No module named 'project'

夙愿已清 提交于 2019-12-02 06:35:40
问题 While I tried to start the worker I got a issue: ImportError: No module named 'project' Traceback (most recent call last): File "/usr/local/bin/celery", line 11, in <module> sys.exit(main()) File "/usr/local/lib/python3.5/dist-packages/celery/__main__.py", line 16, in main _main() File "/usr/local/lib/python3.5/dist-packages/celery/bin/celery.py", line 322, in main cmd.execute_from_commandline(argv) File "/usr/local/lib/python3.5/dist-packages/celery/bin/celery.py", line 496, in execute_from

How to configure celery-redis in django project on microsoft azure?

僤鯓⒐⒋嵵緔 提交于 2019-12-02 06:09:12
I have this django locator project deployed in azure. My redis cache host name(DNS) is mycompany.azure.microsoft.net. I created it in azure, but not sure where i can find the password for the redis server. I have got this as my configuration in my settings.py. I am using redis as a broker for my celery setup in project. BROKER_URL = 'redis://:passwordAzureAccessKey=@mycompany.redis.cache.windows.net:6380/0' I could not connect. Is there anyplace different, I need to put password or username to connect to the above server ? Also where can i find the password in Azure. Or is it due to the fact