The Backend Engineering Show with Hussein Nasser

This is an honest video about burnout and what a content creator can do to avoid it creating content on YouTube. Support my work on PayPal https://bit.ly/33ENps4

In this episode of the backend engineering show, I'll discuss long polling technique of backend communication. I will also touch upon Polling and Pushing too and the pros and cons of each. * Intro 0:00 * Polling 2:45 * Pushing 6:30 * Long Polling 18:00 * SSE 23:00 Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses

In this episode of the Backend Engineering show, we will go through the new features in Postgres 14. Here is a rundown of improvements made to the database platform with timestamps. 0:00 Intro 2:20 Performance 18:50 Data Types and SQL 23:00 Administration 32:30 Replication and Recovery 35:47 Security Postgres 14 Beta 1 https://www.postgresql.org/about/news/postgresql-14-beta-1-released-2213/ Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube   🧑‍🏫 Courses I Teach https://husseinnasser.com/courses 

In this episode of the Backend Engineering Show, I’ll explain the OSI Model with an example. I start with the physical layer which is often ignored moved up to the application layer, presentation layer, session layer, transport layer, IP layer, and data link layer. I believe every software engineer should understand the OSI Model as it helps cement the fundamental understanding of networking applications. Intro 0:00 Layer 1 Physical 4:00 Layer 7 Application 9:45 Layer 6 Presentation 11:30 Layer 5 Session 14:20 Layer 4 Transport 15:00 Layer 3 IP 18:00 Layer 2 Data Link 20:00 Summary 28:00 Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses

The podcast explores the nature of communications in database systems, including communication protocols, 3-tier web architecture, connection pooling, and database connection multiplexing. It also discusses the challenges of handling high concurrency in databases and explores potential solutions such as multiplexing protocols like HTTP/2 and QUIC.

DST Root CA X3 Expires on September 2021, a ROOT certificate that signs Let's Encrypt Certificate authority, a very popular CA. In this video, I will discuss the ramification of this change. Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses 🏭 Backend Engineering Videos in Order https://backend.husseinnasser.com

Salesforce services went down as a result of a DNS update, let us discuss how can tiny DNS unavailability cause a severe outage of 5 hours. From salesforce "On May 11, 2021, at approximately 21:08 Universal Coordinated Time (UTC), the Salesforce Technology team became aware of a service disruption across Salesforce production instances. The disruption impacted the ability for users to log into their Salesforce environments within the core Salesforce services, Marketing Cloud, Commerce Cloud, Government Cloud, Experience Cloud, Heroku, Pardot, and Vlocity. In addition, the status.salesforce.com Trust site was also unavailable, and customers were unable to log support cases. Some customers may have also experienced issues with Multi-Factor Authentication (MFA) during the incident. " Resources https://help.salesforce.com/articleView?id=000358392&type=1&mode=1 Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses 🏭 Backend Engineering Videos in Order https://backend.husseinnasser.com

In this show, I go into detail on how HAProxy achieved 2 million HTTP requests per second. This is a very well-written article that discusses how the HAProxy team benchmarked the product on a 64 core ARM machine leading to over 2 million requests per second. There are many components and low-level points that I try to elaborate on, timestamps below.  0:00 Intro  2:40 Summary of the Article  11:55 Latency and Throughput in HAProxy 2.3 vs 2.4  21:00 How TCP Connections Affects Performance  28:00 Maximum Packets we can get in 100Gbps Network?  35:00 How 64 Cores are divided between workloads  40:00 Tail latencies HAProxy 2.3 vs 2.4  42:50 How TLS Affects Performance?  HAProxy Blog https://www.haproxy.com/blog/haproxy-forwards-over-2-million-http-requests-per-second-on-a-single-aws-arm-instance/ Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses

In this show, I discuss why we have 3 data models in database systems, OLTP (Online Transactional Processing) OLAP (Online Analytical Processing), and HTAP (Hybrid Transactional Analytical Processing). I’ll also explain the difference between them, the use of ETL tools (extract transform load) to load data from transactional to analytical databases, and what is the future of HTAP. Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses

Watch this if you are using IP Address validation in both NodeJS and Python, these two libraries strip leading zeros which can lead to server side request forgery. Let us discuss Resources https://www.bleepingcomputer.com/news/security/critical-netmask-networking-bug-impacts-thousands-of-applications/ https://www.bleepingcomputer.com/news/security/python-also-impacted-by-critical-ip-address-validation-vulnerability/ Support my work on PayPal https://bit.ly/33ENps4 Become a Member on YouTube https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join 🧑‍🏫 Courses I Teach https://husseinnasser.com/courses