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
A Django web application that allows you to be in the loop about everything happening in your neighborhood.

A Django web application that allows you to be in the loop about everything happening in your neighborhood. From contact information of different handyman to meeting announcements or even alerts.

Kennedy Ngugi Mwaura 3 Dec 11, 2022
Fully reponsive Chat Application built with django, javascript, materialUi, bootstrap4, html and css.

Chat app (Full Stack Frameworks with Django Project) Fully reponsive Chat Application built with django, javascript, materialUi, bootstrap4, html and

1 Jan 19, 2022
🗂️ 🔍 Geospatial Data Management and Search API - Django Apps

Geospatial Data API in Django Resonant GeoData (RGD) is a series of Django applications well suited for cataloging and searching annotated geospatial

Resonant GeoData 53 Nov 01, 2022
Organize Django settings into multiple files and directories. Easily override and modify settings. Use wildcards and optional settings files.

Organize Django settings into multiple files and directories. Easily override and modify settings. Use wildcards in settings file paths and mark setti

Nikita Sobolev 940 Jan 03, 2023
Django CacheMiddleware has a multi-threading issue with pylibmc

django-pylibmc-bug Django CacheMiddleware has a multi-threading issue with pylibmc. CacheMiddleware shares a thread-unsafe cache object with many thre

Iuri de Silvio 1 Oct 19, 2022
A Django/Python web app that functions as a digital diary

My Django Diary Full-stack web application that functions as a digital diary using Django, Python, SQLite, HTML & CSS. Things I learned during this pr

1 Sep 30, 2022
Django project starter on steroids: quickly create a Django app AND generate source code for data models + REST/GraphQL APIs (the generated code is auto-linted and has 100% test coverage).

Create Django App 💛 We're a Django project starter on steroids! One-line command to create a Django app with all the dependencies auto-installed AND

imagine.ai 68 Oct 19, 2022
A middleware to log the requests and responses using loguru.

Django Loguru The extension was based on another one and added some extra flavours. One of the biggest problems with the apps is the logging and that

Tiago Silva 9 Oct 11, 2022
Django app for building dashboards using raw SQL queries

django-sql-dashboard Django app for building dashboards using raw SQL queries Brings a useful subset of Datasette to Django. Currently only works with

Simon Willison 383 Jan 06, 2023
A set of high-level abstractions for Django forms

django-formtools Django's "formtools" is a set of high-level abstractions for Django forms. Currently for form previews and multi-step forms. This cod

Jazzband 621 Dec 30, 2022
Django backend of Helium's planner application

Helium Platform Project Prerequisites Python (= 3.6) Pip (= 9.0) MySQL (= 5.7) Redis (= 3.2) Getting Started The Platform is developed using Pytho

Helium Edu 17 Dec 14, 2022
No effort, no worry, maximum performance.

Django Cachalot Caches your Django ORM queries and automatically invalidates them. Documentation: http://django-cachalot.readthedocs.io Table of Conte

NoriPyt 980 Jan 06, 2023
Django Starter is a simple Skeleton to start with a Django project.

Django Starter Template Description Django Starter is a simple Skeleton to start

Numan Ibn Mazid 1 Jan 10, 2022
Basic implementation of Razorpay payment gateway 💳 with Django

Razorpay Payment Integration in Django 💥 In this project Razorpay payment gateway 💳 is integrated with Django by breaking down the whole process int

ScaleReal 12 Dec 12, 2022
Median and percentile for Django and MongoEngine

Tailslide Median and percentile for Django and MongoEngine Supports: PostgreSQL SQLite MariaDB MySQL (with an extension) SQL Server MongoDB 🔥 Uses na

Andrew Kane 4 Jan 15, 2022
Book search Django web project that uses requests python library and openlibrary API.

Book Search API Developer: Vladimir Vojtenko Book search Django web project that uses requests python library and openlibrary API. #requests #openlibr

1 Dec 08, 2021
Vehicle registration using Python, Django and SQlite3

PythonCrud Cadastro de veículos utilizando Python, Django e SQlite3 Para acessar o deploy no Heroku:

Jorge Thiago 4 May 20, 2022
✋ Auto logout a user after specific time in Django

django-auto-logout Auto logout a user after specific time in Django. Works with Python 🐍 ≥ 3.7, Django 🌐 ≥ 3.0. ✔️ Installation pip install django-a

Georgy Bazhukov 21 Dec 26, 2022
Django + NextJS + Tailwind Boilerplate

django + NextJS + Tailwind Boilerplate About A Django project boilerplate/templa

Shayan Debroy 3 Mar 11, 2022
Django web apps for managing schedules.

skdue Description Skdue is a web application that makes your life easier by helping you manage your schedule. With the ability which allows you to cre

Patkamon_Awai 1 Jun 30, 2022