a7ec1a089c
We have a very useful piece of code, _RateLimitFilter, which is designed to avoid sending us a billion error emails in the event that a Zulip production server is down in a way that throws the same exception a lot. The code uses memcached to ensure we send each traceback roughly once per Zulip server per 10 minutes (or if memcached is unavailable, at most 1/process/10 minutes, since we use memcached to coordinate between processes) However, if memcached is down, there is a logging.error call internal to the Django/memcached setup that happens inside the cache.set() call, and those aren't caught by the `except Exception` block around it. This ends up resulting in infinite recursion, eventually leading to Fatal Python error: Cannot recover from stack overflow., since this handler is configured to run for logging.error in addition to logging.exception. We fix this using a thread-local variable to detect whether we are being called recursively. This change should prevent some nasty failure modes we've had in the past where memcached being down resulted in infinite recursion (resulting in extra resources being consumed by our error notifications code, and most importantly, the error notifications not being sent). Fixes #12595. |
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| Dockerfile-postgresql | ||
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Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 500 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
Getting started
Click on the appropriate link below. If nothing seems to apply, join us on the Zulip community server and tell us what's up!
You might be interested in:
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Contributing code. Check out our guide for new contributors to get started. Zulip prides itself on maintaining a clean and well-tested codebase, and a stock of hundreds of beginner-friendly issues.
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Contributing non-code. Report an issue, translate Zulip into your language, write for the Zulip blog, or give us feedback. We would love to hear from you, even if you're just trying the product out.
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Supporting Zulip. Advocate for your organization to use Zulip, write a review in the mobile app stores, or upvote Zulip on product comparison sites.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading Zulip for open source, Zulip for companies, or Zulip for working groups and part time communities.
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Running a Zulip server. Setting up a server takes just a couple of minutes. Zulip runs on Ubuntu 18.04 Bionic, Ubuntu 16.04 Xenial, and Debian 9 Stretch. The installation process is documented here. Commercial support is available; see https://zulipchat.com/plans for details.
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Using Zulip without setting up a server. https://zulipchat.com offers free and commercial hosting.
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Applying for a Zulip internship. Zulip runs internship programs with Outreachy, Google Summer of Code, and the MIT Externship program. Zulip also participates in Google Code-In. More information is available here.
You may also be interested in reading our blog or following us on twitter. Zulip is distributed under the Apache 2.0 license.