Django CacheMiddleware has a multi-threading issue with pylibmc

Related tags

Djangodjango-pylibmc-bug
Overview

django-pylibmc-bug

Django CacheMiddleware has a multi-threading issue with pylibmc.

CacheMiddleware shares a thread-unsafe cache object with many threads. It works in most cache backends have Python implementations, but pylibmc is C with Python bindings.

How to reproduce

This is a simple Django project, with only django and pylibmc installed. Just start it ./manage.py runserver with a localhost memcached and run lots of concurrent requests: ab -n100 -c10 http://localhost:8000/

This will trigger some exceptions like:

Traceback (most recent call last):
  File "pylibmcbug/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "pylibmcbug/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "pylibmcbug/lib/python3.9/site-packages/django/utils/decorators.py", line 122, in _wrapped_view
    result = middleware.process_request(request)
  File "pylibmcbug/lib/python3.9/site-packages/django/middleware/cache.py", line 145, in process_request
    cache_key = get_cache_key(request, self.key_prefix, 'GET', cache=self.cache)
  File "pylibmcbug/lib/python3.9/site-packages/django/utils/cache.py", line 362, in get_cache_key
    headerlist = cache.get(cache_key)
  File "pylibmcbug/lib/python3.9/site-packages/django/core/cache/backends/memcached.py", line 77, in get
    return self._cache.get(key, default)
pylibmc.ConnectionError: error 3 from memcached_get(:1:views.decorators.cache.cache_): (0x7f290400bd60) FAILURE, poll() returned a value that was not dealt with,  host: localhost:11211 -> libmemcached/io.cc:254
Owner
Iuri de Silvio
Iuri de Silvio
GitHub Repository
Store events and publish to Kafka

Create an event from Django ORM object model, store the event into the database and also publish it into Kafka cluster.

Diag 6 Nov 30, 2022
Silk is a live profiling and inspection tool for the Django framework.

Silk is a live profiling and inspection tool for the Django framework. Silk intercepts and stores HTTP requests and database queries before presenting them in a user interface for further inspection:

Jazzband 3.7k Jan 02, 2023
TinyApp - A Python (Django) Full Stack Application for shortening URLs

TinyApp A Python (Django) Full Stack Application for shortening URLs. How to sta

Li Deng 1 Jan 23, 2022
This repository contains django library management system project.

Library Management System Django ** INSTALLATION** First of all install python on your system. Then run pip install -r requirements.txt to required se

whoisdinanath 1 Dec 26, 2022
DRF_commands is a Django package that helps you to create django rest framework endpoints faster using manage.py.

DRF_commands is a Django package that helps you to create django rest framework endpoints faster using manage.py.

Mokrani Yacine 2 Sep 28, 2022
A GitHub Action for checking Django migrations

🔍 Django migrations checker A GitHub Action for checking Django migrations About This repository contains a Github Action that checks Django migratio

Oda 5 Nov 15, 2022
Full control of form rendering in the templates.

django-floppyforms Full control of form rendering in the templates. Authors: Gregor Müllegger and many many contributors Original creator: Bruno Renié

Jazzband 811 Dec 01, 2022
A Django web application that shortens long URLs. This is a demo project to show off my tech abilities.

Django URL Shortener This project is just a complete and production-ready URL shortener web application to show off my tech and coding abilities. Impo

Seyyed Ali Ayati 5 Jan 26, 2022
React.JS - Django Application Template

OTS React.JS - DJango Web Application (UNTESTED) This repository servers as a template for creating React.JS - Django Web Applications. Note that the

Darryl See Wei Shen 5 Aug 19, 2022
A django model and form field for normalised phone numbers using python-phonenumbers

django-phonenumber-field A Django library which interfaces with python-phonenumbers to validate, pretty print and convert phone numbers. python-phonen

Stefan Foulis 1.3k Dec 31, 2022
A Student/ School management application built using Django and Python.

Student Management An awesome student management app built using Django.! Explore the docs » View Demo · Report Bug · Request Feature Table of Content

Nishant Sethi 1 Feb 10, 2022
Atualizando o projeto APIs REST Django REST 2.0

APIs REST Django REST 3.0-KevinSoffa Atualização do projeto APIs REST Django REST 2.0-Kevin Soffa Melhorando e adicionando funcionalidades O que já fo

Kevin Soffa 2 Dec 13, 2022
A simple Django dev environment setup with docker for demo purposes for GalsenDev community

GalsenDEV Docker Demo This is a basic Django dev environment setup with docker and docker-compose for a GalsenDev Meetup. The main purposes was to mak

3 Jul 03, 2021
CRUD with MySQL, Django and Sass.

CRUD with MySQL, Django and Sass. To have the same data in db: insert into crud_employee (first_name, last_name, email, phone, location, university) v

Luis Quiñones Requelme 1 Nov 19, 2021
User Authentication In Django/Ajax/Jquery

User Authentication In Django/Ajax/Jquery Demo: Authentication System Using Django/Ajax/Jquery Demo: Authentication System Using Django Overview The D

Suman Raj Khanal 10 Mar 26, 2022
A CBV to handle multiple forms in one view

django-shapeshifter A common problem in Django is how to have a view, especially a class-based view that can display and process multiple forms at onc

Kenneth Love 167 Nov 26, 2022
Dockerizing Django with Postgres, Gunicorn, Nginx and Certbot. A fully Django starter project.

Dockerizing Django with Postgres, Gunicorn, Nginx and Certbot 🚀 Features A Django stater project with fully basic requirements for a production-ready

8 Jun 27, 2022
Get inside your stronghold and make all your Django views default login_required

Stronghold Get inside your stronghold and make all your Django views default login_required Stronghold is a very small and easy to use django app that

Mike Grouchy 384 Nov 23, 2022
Bootstrap 4 integration with Django.

django-bootstrap 4 Bootstrap 4 integration for Django. Goal The goal of this project is to seamlessly blend Django and Bootstrap 4. Requirements Pytho

Zostera B.V. 980 Dec 29, 2022
Official Python agent for the Elastic APM

elastic-apm -- Elastic APM agent for Python This is the official Python module for Elastic APM. It provides full out-of-the-box support for many of th

elastic 369 Jan 05, 2023