@kodekloud: How WhatsApp Moves 100 Billion Messages a Day 📱 Your phone keeps one persistent TCP connection open to a chat server. Each server runs Erlang on FreeBSD and holds about 2 million connections, and a routing table maps every user to a server so your message hops from server to server and drops onto your friend's phone. Nothing stays stored once it's delivered. No cloud backup means a deleted chat is gone for good. Fair design, or a dealbreaker? Tell us below 👇 #WhatsApp #SystemDesign #HowWhatsAppWorks #Erlang #FreeBSD #DistributedSystems #BackendEngineering #Scalability #SoftwareEngineering #TechExplained #KodeKloud #DevOps

KodeKloud
KodeKloud
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Region: PL
Wednesday 09 September 2026 13:25:18 GMT
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teachchipere
Teach Chipere :
so how is it possible police can retrieve deleted massages
2026-09-09 14:37:21
70
doyoukotoda
drippinthenics :
"ur messages is deleted" : yes we believe u
2026-09-10 06:21:22
15
amebared
private :
You forgot the NSA server 😅
2026-09-09 15:20:46
29
raka_die_ondier
Raka 🪰 :
Now please do a follow up where you mention the actual stack, please. Let's get technical
2026-09-10 18:20:52
0
buddy12455
Buddy :
general mkhwanazi can retrieve it
2026-09-10 17:41:35
0
oshayeh3
Shane :
doesn't use that anymore
2026-09-10 17:07:47
0
sallltiktokacc
SSAL :
That was before, now they do not encrypt
2026-09-09 17:53:00
9
designpoa
I.T :
beam runtime
2026-09-10 17:43:32
0
ooqoosoo
𓆩 𓂋 𓆪 :
why is the AI is out of breath every sentence
2026-09-09 19:48:55
47
rsa9619
user7824665497109 :
next question is how the routing table get refresh and updated correctly, what if the table is not updated what will happen to the sent messages
2026-09-09 22:57:57
0
snozizwe
snozizwe :
you guys have not heard about general mkhwanazi 😂😂😂
2026-09-09 21:16:55
3
abssar_
Abssar Gillani :
Its amazing
2026-09-10 04:17:25
0
lucianfundamentalists
Lucian :
what if the user never comes online
2026-09-09 15:31:37
0
krisruns
KrisRuns :
How do they make money?
2026-09-09 19:48:28
0
quincyqool87
Justin :
And this all happens in less than a second!
2026-09-10 05:47:43
2
ved_313
Ali :
can u compare WhatsApp to telegram?
2026-09-10 01:29:37
5
peffy11
peffy :
I'm not convinced that all this information is stored in memory. Are you saying that the offline tier is in memory? This is not likely because there might be millions of messages containing images and video. It's more likely that this router is on disk. I'm also not convinced that even the routing table is in memory
2026-09-09 15:56:38
2
thabo267
Thabo M :
How is the PKTT retrieving old WhatsApp message...
2026-09-10 06:12:10
0
camedoza.d
camedoza :
Thanks for another video explaining how the real system works! It really broadens my horizons - I love your videos. Could you please talk about how Telegram works, if possible? After all, it’s open-source, and their infrastructure is more or less known.
2026-09-09 14:15:22
5
rob763269
Rob :
what about group chats? if there’s 20 people, the msg goes to each server as well?
2026-09-09 21:18:57
0
fm_is_here
Redwood :
WhatsApp does a pretty bad job with offline messages, if it’s a photo that you don’t pick up soon, it doesn’t download it for some reason!
2026-09-09 20:30:55
1
peterchilufya404
DailyRiseZM :
you said the transmission use tcp for messages what about video calls which use udp
2026-09-10 04:09:57
1
chigozicharles
chigozi :
this is too much for my brain to understand
2026-09-10 06:41:06
1
deslyfox
Sly Fox III :
Wait a minute - how do you know my friend is on server 200 😅
2026-09-09 19:50:52
2
prosperjeje
￴ ￴ ￴ ￴ ￴ ￴￴ ￴ ￴ ￴ ￴ ￴ ￴ ￴ ￴ :
it is vibe coded
2026-09-09 22:45:44
1
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