Félix Malfait
1feb41eb64
## Rationale Every event-stream create/destroy in a workspace serializes on a single cache lock (`workspace:<id>:activeStreams`) just to run `setAdd`/`setRemove`. On Redis those are native `SADD`/`SREM` — already atomic (`cache-storage.service.ts:79-109`) — so the lock adds zero correctness. What it does add: 100ms lock-retry polling under concurrency, and a hard 5s ceiling (50 retries × 100ms, `cache-lock.service.ts:36`) after which stream creation **fails** with `Failed to acquire lock`. **Production evidence (Sentry):** [TWENTY-SERVER-H3W](https://twenty-v7.sentry.io/issues/TWENTY-SERVER-H3W) (125 events, 16 users) server-side and [TWENTY-FRONT-6MM](https://twenty-v7.sentry.io/issues/TWENTY-FRONT-6MM) (65 users) client-side — spiky, consistent with deploy-driven reconnect storms in large workspaces where every tab reconnects at once and queues on one lock. ## Why this is the root cause, not a symptom patch The failure isn't "the lock timeout is too short" (raising it would just trade errors for latency) — it's that the critical section doesn't exist. A set-membership add/remove of a single element has no read-modify-write window on Redis. The lock that **is** legitimate stays untouched: `@WithLock` on `addQuery`/`removeQuery`, which genuinely read-modify-write the JSON queries map. The non-Redis fallback of `setAdd` is read-modify-write, but that path only serves single-node dev/test setups where the worst case is a transiently miscounted metrics gauge (`twenty_event_streams_live_total`), not a correctness issue — the authoritative per-stream state lives in its own key. ## User impact During reconnect storms (deploys, network blips) in busy workspaces, tabs no longer randomly fail to establish their event stream — which previously meant no live updates for that tab and, through the strict client error path, a crash of the listener sync loop (fixed separately in #22475). Also removes up-to-5s of serialized queueing latency per workspace on every connect wave. ## Test plan - [x] Verified `setAdd`/`setRemove` are native `SADD`/`SREM` + `EXPIRE` on the Redis path - [x] No callers depend on the lock's ordering (checked `engine/subscriptions` call sites) - [ ] CI green https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38 --- _Generated by [Claude Code](https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38)_ <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/twentyhq/twenty/pull/22476?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. -->
The #1 Open-Source CRM
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Why Twenty
Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack.
Learn more about why we built Twenty
Installation
Cloud
The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date.
Build an app
Scaffold a new app with the Twenty CLI:
npx create-twenty-app my-app
Define objects, fields, and views as code:
import { defineObject, FieldType } from 'twenty-sdk/define';
export default defineObject({
nameSingular: 'deal',
namePlural: 'deals',
labelSingular: 'Deal',
labelPlural: 'Deals',
fields: [
{ name: 'name', label: 'Name', type: FieldType.TEXT },
{ name: 'amount', label: 'Amount', type: FieldType.CURRENCY },
{ name: 'closeDate', label: 'Close Date', type: FieldType.DATE_TIME },
],
});
Then ship it to your workspace:
npx twenty app:publish --private
See the app development guide for objects, views, agents, and logic functions.
Self-hosting
Run Twenty on your own infrastructure with Docker Compose, or contribute locally via the local setup guide.
Everything you need
Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box.
Want to go deeper? Read the 
User Guide for product walkthroughs, or the Documentation for developer reference.
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Learn more about version control in doc
Stack
TypeScript
Nx
NestJS, with BullMQ, 
PostgreSQL, 
Redis
React, with Jotai, Linaria and Lingui
Thanks
Thanks to these amazing services that we use and recommend for code review (Greptile), catching bugs (Sentry) and translating (Crowdin).
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