Apache Kafka is an interesting software, every design decision the team makes perfect sense. I decided to dive deep into the discussion of the consumer group concept which is underrated and talk more about it.

0:00 Intro

1:24 Messaging Systems Explained

3:30 Partitioning

4:30 Pub/Sub vs Queue

6:55 Consumer Group

10:00 Parallelism in Consumer Group

10:30 Partition awareness in Consumer Group

11:30 Achieving Pub/Sub with Consumer Group

14:00 Head of Line blocking in Kafka

Someone asked me a question and I felt its interesting to make a video about, is there a limit to the maximum number of TCP connections a Client can make to the server? If there is what is it? and how does that make sense in all the configurations?

0:00 Intro

1:00 Is there a Max Connection Limit?

4:30 64K Connection Limit Explained

7:20 Max Connections on Reverse Proxies and Max Connections

14:30 How does Router get around Max Connections?

7:00 3 million whatsapp https://www.youtube.com/watch?v=vQ5o4wPvUXg

10:25 envoy https://www.youtube.com/watch?v=40gKzHQWgP0&

12:50 google https://www.youtube.com/watch?v=CUiBVTcgvBU

14:00 Active Active https://www.youtube.com/watch?v=d-Bfi5qywFo

Doordash the food delivery service has built an asynchronous task processing backend with Celery and RabbitMQ. They are having lots of outages and problems. Let us discuss how they solved their problem by moving to Apache Kafka.

Very well written article.

Resource

https://doordash.engineering/2020/09/03/eliminating-task-processing-outages-with-kafka/

https://www.rabbitmq.com/connections.html#high-connection-churn

Application-Layer Protocol Negotiation (ALPN) is a Transport Layer Security (TLS) extension that allows the application layer to negotiate which protocol should be performed over a secure connection in a manner that avoids additional round trips and which is independent of the application-layer protocols. It is needed by secure HTTP/2 connections, which improves the compression of web pages and reduces their latency compared to HTTP/1.x. The ALPN and HTTP/2 standards emerged from development work done by Google on the now withdrawn SPDY protocol.

https://en.wikipedia.org/wiki/Application-Layer_Protocol_Negotiation

1:30 TCP Handshake

1:40 TLS

In this video I explain when to use TCP vs UDP as a communication protocol on your backend app. I go through the advantages and disadvantages of UDP I also discuss the protocol within the context of Chatting System, Multiplayer game, and building a browser and a web server   0:00 Intro 2:00 UDP 3:00 TCP 6:00 UDP vs TCP for Building a Chatting System  9:20 UDP vs TCP for Building a Multiplayer game  15:30 UDP vs TCP for Building a Browser and WebServer 19:11 Summary

HTTP/2 is a protocol that allows multiplexing which can be very beneficial however HTTP/2 is not always cheap and might not be a good choice for your backend.

* Intro 0:00

* What is HTTP/2 ? 1:30

* HTTP/2 Pros 5:10

* HTTP/2 Advantages on Browsers 5:30

* HTTP/2 Advantages on Reverse Proxy Connection Pooling 9:20

* HTTP/2 Problem 11:00

Google Talk https://www.youtube.com/watch?v=xxN4FfwaANk

Envoy is an open-source L7 proxy and communication bus Originally built at Lyft to move their architecture away from a monolith.

In this video, I want to go through the following

* What is Envoy? 0:00

* Current & Desired Architecture 0:48

* Envoy Architeture 3:00

* DownStream/Upstream 7:30

* Clusters 9:19

* Listeners 10:50

* Network Filters 11:50

* Connection Pools 13:45

* Threading Model 18:34

* Example 21:25

* Show the 4 apps 24:30

* Install Envoy Brew 26:00

*  https://www.getenvoy.io/install/envoy/macos/

* Envoy as a Layer 7 Proxy 27:30

* Proxy to all 4 backend NodeJS services 28:00

* Split load to multiple backends (app1/app2) 40:00

* Block certain requests (/admin) 45:30

* Envoy as a Layer 4 Proxy (tcp router) 47:50

* Create DNS record 54:00

* Enable HTTPS on Envoy (lets encrypt) 55:30

* Enable HTTP/2 on Envoy 1:03:00

* Disable 1.1/1.0 Enable TLS 1.2 and TLS 1.3 ONLY on Envoy 1:04:30

* SSL Labs test 1:06:40

* Summary 1:07:24

Config

https://github.com/hnasr/javascript_playground/tree/master/envoy

Resources

https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/intro/terminology

https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/upstream/connection_pooling#arch-overview-conn-pool

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Stay Awesome,

Hussein

Envoy Proxy is an L3/L4 Proxy that is designed to be service mesh, In this video, I discuss my initial thoughts about the product, design choices, and much more. The actual full video on Envoy will be coming soon stay tuned.

In this video, I explain Postgres Vacuum while I walk my dog.