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Deno

Deno 2.8 | Deno Claw Patrol: an open-source security firewall for agents | Deno Fresh 2.3: Zero JS by default, View Transitions, and Temporal support | Deno Deno 2.7: Temporal API, Windows ARM, and npm overrides | Deno Build a dinosaur runner game with Deno, pt. 6 | Deno Build a dinosaur runner game with Deno, pt. 5 | Deno Deno Deploy is Generally Available | Deno Introducing Deno Sandbox | Deno Build a dinosaur runner game with Deno, pt. 4 | Deno Build a dinosaur runner game with Deno, pt. 3 | Deno Build a dinosaur runner game with Deno, pt. 2 | Deno React / Next.js Denial-of-Service Vulnerability: Deno Deploy users protected | Deno Deno 2.6: dx is the new npx | Deno Build a dinosaur runner game with Deno, pt. 1 | Deno React Server Functions / Next.js Vulnerability: Deno Deploy users protected | Deno My highlights from the new Deno Deploy | Deno Deno's Other Open Source Projects | Deno How Deno protects against npm exploits | Deno Help Us Raise $200k to Free JavaScript from Oracle | Deno Deno 2.5: Permissions in the config file | Deno Fresh 2.0 Graduates to Beta, Adds Vite Support | Deno Deno 2.4: deno bundle is back | Deno JavaScript™ Trademark Update | Deno What's coming to JavaScript | Deno A brief history of JavaScript | Deno Reports of Deno's Demise Have Been Greatly Exaggerated | Deno An Update on Fresh | Deno How Plaid migrated 100 services to a new database platform 5x faster with Deno | Deno Deno 2.3: Improved deno compile, local npm packages, and more | Deno Add JSR packages with pnpm and Yarn | Deno Zero-config Debugging with Deno and OpenTelemetry | Deno Exploring Art with TypeScript, Jupyter, Polars, and Observable Plot | Deno Deno v Oracle Update 3: Fighting the JavaScript Trademark | Deno Build a custom RAG AI agent in TypeScript and Jupyter | Deno How to get deep traces in your Node.js backend with OTel and Deno | Deno toranoana.deno #20 登録受付中(2025年3月14日) | Deno Node just added TypeScript support. What does that mean for Deno? | Deno The Dino 🦕, the Llama 🦙, and the Whale 🐋 | Deno Publish a lint rule, get a prize | Deno Deno 2.2: OpenTelemetry, Lint Plugins, node:sqlite | Deno If you're not using npm specifiers, you're doing it wrong | Deno How Deno's documentation is evolving | Deno Oracle justified its JavaScript trademark with Node.js—now it wants that ignored | Deno Introducing the JSR open governance board | Deno Intro to Wasm in Deno | Deno Announcing OpenAI on JSR | Deno Deno in 2024 | Deno Goodbye WinterCG, welcome WinterTC | Deno Build a SolidJS app with Deno | Deno Run your Next.js SSR app on Deno Deploy | Deno Solve Advent of Code 2024 with Deno and Win Prizes! | Deno Deno v. Oracle: Canceling the JavaScript Trademark | Deno Deno 2.1: Wasm Imports and other enhancements | Deno Build a Typesafe API with tRPC and Deno | Deno Self-contained Executable Programs with Deno Compile | Deno Build a Database App with Drizzle ORM and Deno | Deno Introducing your new JavaScript package manager: Deno | Deno Announcing Growthbook on JSR | Deno Build an Astro site with Deno | Deno How to convert CommonJS to ESM | Deno Announcing Deno 2 | Deno The Final Touches: What’s New In v2.0.0-rc.10 | Deno Announcing Stable V8 Bindings for Rust | Deno Deno 2.0 Release Candidate | Deno Secure, efficient private npm registries with Cloudsmith and Deno | Deno Painting the Plane as We Fly It: Designing JSR | Deno Introducing Web Cache API support on Deno Deploy | Deno Deno 1.46: The Last 1.x Release | Deno Protect your cloud spend with new Deno Deploy spend limits | Deno What we got wrong about HTTP imports | Deno Benchmarking AWS Lambda Cold Starts Across JavaScript Runtimes | Deno Announcing Supabase on JSR | Deno Deno 1.45: Workspace and Monorepo Support | Deno Introducing KV Backup for Deno Subhosting | Deno A Gentle Intro to TypeScript | Deno Announcing Hono on JSR | Deno How We Made the Deno Language Server Ten Times Faster | Deno How the Guardian uses Deno to audit accessibility and performance across their 2.7 million articles | Deno Introducing More Flexible Domain Association for Deno Subhosting | Deno The stabilization process of the Standard Library has begun | Deno Deno 1.44: Private npm registries, improved Node.js compat, and performance boosts | Deno How we built a secure, performant, multi-tenant cloud platform to run untrusted code | Deno The Deno Standard Library is now available on JSR | Deno How to document your JavaScript package | Deno Your Low Code Solution Needs an Escape Hatch | Deno Deno 1.43: Improved Language Server performance | Deno How Slack used Deno to save months of engineering effort in launching their new platform | Deno JSR Is Not Another Package Manager | Deno Announcing the Hookdeck SDK on JSR | Deno Announcing the Neon Serverless Driver on JSR | Deno An intro to TSConfig for JavaScript Developers | Deno How we built JSR | Deno How Netlify used Deno Subhosting to build a successful edge functions product | Deno Introducing Simpler Project Creation in Deno Deploy | Deno Deno 1.42: Better dependency management with JSR | Deno Introducing deployctl, the command line interface for Deno Deploy | Deno Introducing JSR - the JavaScript Registry | Deno How to add Monaco to a Next.js app and securely run untrusted user code | Deno Survey Results and Roadmap | Deno Deno 1.41: smaller deno compile binaries | Deno
September 23 incident update | Deno
Luca Casonat · 2021-09-23 · via Deno

On Thursday at 3:11 UTC several services provided by the Deno company had a 35 minute service disruption. During this time projects hosted at Deno Deploy and the deno.land website were not responding. We have concluded that this outage was the result of an unexpected database maintenance event. This post details what exactly happened, how we recovered the systems, and what we are doing to prevent this in the future.

All services are now operating normally again. No data was lost. We take outages like these seriously and sincerely apologize for the disruption.

Timeline of events

At 3:11 UTC a primary Postgres database hosted on Google Cloud Platform started an unexpected maintenance event.

At 3:13 UTC an automated alarm triggered that a request to deno.land/std failed.

At 3:32 UTC the database maintenance finished, but ended in a unknown failure state.

At 3:48 UTC the database server restarted automatically due to the earlier failure, and the alarm was cleared.

Root cause

Deno Deploy has a primary Postgres database that is hosted on Google Cloud Platform. This database is used to store various data that is used by Deno Deploy to run its services. This database is set-up in a highly available fashion, and can fail over to standby replicas when the primary fails.

At 3:11 UTC, Google Cloud Platform started an unexpected maintenance event on the primary Postgres database. During maintenance events, failover is not possible. This meant that the primary database was unavailable for read and writes, causing Deno Deploy services that access this database to fail.

After the maintenance event ended, the database server restarted automatically, and all services that were using the primary database were able to recover.

Impact

During the 35 minute window, requests to Deno Deploy projects failed, including requests to deno.land/x and deno.land/std. Deno programs trying to download modules from /x or /std experienced failures. The Deno Deploy management dashboard at https://dash.deno.com/ and Deno Deploy GitHub integration were also unavailable.

What’s next?

We are in contact with GCP to determine the root cause of this maintenance event, and why the database server took so long to recover. As a temporary measure, we have halted scheduled database maintenance until we have determined a permanent solution to prevent outages like these. Additionally we are investigating solutions to making our services more resilient against primary database failures.