Video 2 : How to start with distributed systems ?

Resilience - Making system safe from failures.

Explains various system design concepts through pizza parlour. Suppose you have a pizza parlour where you take order and deliver pizza.

Scenario 1 : Suddenly, the number of orders you are getting increases. How will you ensure your shop runs properly ?

Optimize the processes and increase throughput using the same resources. This is analogous to vertical scaling.
Prepare some material of pizza before hand during non-peak hours. This is analogous to preprocessing and running cron jobs.
Keep backups by hiring more chefs and avoid single point of failures.
Add more pizza machines. Analogous to horizintal scaling.

Scenario 2 : Expand pizza parlour

Suppose you have many chefs, how will you decide which chef takes which order. Assign chef 1 for garlic bread, ched 2 for pizza etc. This is analogous to Microservic architecture.
Now, what if there is a power outage ? Open one more outlet. Analogous to distributed system.
Distribute load to various parlours. There is a system which does this. This can be thought of as a load balancer.
Decoupling the system - separating out concerns so that the system is more flexible.
Logging to check for error later.
Extensible system.