---
title: "How Slack sends Millions of Messages in Real Time"
url: https://daily.dev/posts/how-slack-sends-millions-of-messages-in-real-time-vaw3gzhu2
source_url: https://blog.quastor.org/p/slack-sends-millions-messages-real-time
type: article
source: "Quastor Daily"
published: 2023-04-17T14:52:40.757Z
updated: 2023-04-17T14:52:40.755Z
tags: ["machine-learning", "performance", "database", "slack", "influxdb", "stripe", "envoy"]
reading_time: 13
upvotes: 49
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# How Slack sends Millions of Messages in Real Time

**[Quastor Daily](https://daily.dev/sources/quastor)** · 13 min read · 49 upvotes · 0 comments

## Summary

How Slack sends millions of messages in Real Time Plus, how Jane Street writes tests, challenges with caching, why tail latencies matter and more. How Slack Sends Millions of Messages in Real time using Channel, Gateway and Presence Servers Consistent Hashing to map Channel IDs to Channel Servers.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://blog.quastor.org/p/slack-sends-millions-messages-real-time>

## Similar posts on daily.dev

- [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 0 upvotes · 0 comments
- [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments
- [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments
- [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments
- [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments

---

Tags: [#machine-learning](https://daily.dev/tags/machine-learning), [#performance](https://daily.dev/tags/performance), [#database](https://daily.dev/tags/database), [#slack](https://daily.dev/tags/slack), [#influxdb](https://daily.dev/tags/influxdb), [#stripe](https://daily.dev/tags/stripe), [#envoy](https://daily.dev/tags/envoy)

[View this post on daily.dev](https://daily.dev/posts/how-slack-sends-millions-of-messages-in-real-time-vaw3gzhu2)