Radha Kumari

2 articles by Radha Kumari.

Traffic 101: Packets Mostly Flow

Slack handles billions of inbound network requests per day, all of which traverse through our edge network and ingress load balancing tiers. In this blog post, we’ll talk about how a request flows — from a Slack’s user perspective — across the vast ether of the network to reach AWS and then Slack’s internal…

RKRadha Kumari·August 28, 2023Networking

Migrating Millions of Concurrent Websockets to Envoy

Slack has a global customer base, with millions of simultaneously connected users at peak times. Most of the communication between users involves sending lots of tiny messages to each other. For much of Slack’s history, we’ve used HAProxy as a load balancer for all incoming traffic. Today, we’ll talk about problems we faced with HAProxy,…

RKRadha Kumari·March 15, 2021Engineering