Availability | System Design Interview Basics 2022

Learn about Availability to ace your system design interview and get an offer of big tech companies like Facebook, Amazon, Apple, Netflix, Google. This video covers the availability patterns of Fallover and Repetition and what you really need to know about them to succeed at your system design interview.
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⭐️ Contents ⭐️
⌨️ (00:00) Intro
⌨️ (0:23) Why does Availability Matter?
⌨️ (54:00) Business Impact of Unavailability
⌨️ (01:20) Availability in Numbers
⌨️ (02:16) The Struggle with Large Distributed Systems
⌨️ (03:08) Availability Patterns
⌨️ (03:23) Failover Pattern
⌨️ (03:44) Active-Passive
⌨️ (04:53) Active-Active
⌨️ (05:50) Replication Pattern
⌨️ (07:33) Primary-Replica
⌨️ (09:37) Primary-Primary
⌨️ (12:00) In the Interview
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[@mopsyched]

Good work Lad!
To summarize: Availability is removing a single point of failure or ensuring your average downtime over a UNIT (year, month, xzy) is as low as possible. Many companies have SLAs 99.9%.. which means Availability is not 100% uptime (this is more tightly coupled to reliability).
Availability is a High-level topic or best practice since its a BIG PICTURE.
Best practices include:
1. redundancy( Nodes/Process) : DB level
App Level
Ensures backup nodes to take controlled of lost node
Example: Multiple Redundant DCs, or More Primary and secondary nodes (Active Passive ).
2. Replication of Data : or Making those out of sync redundant nodes synched or ensures consistency (eventual or perfect)
3. Fail Over strategies set ( SINGLE LEADER, MULTIPLE LEADERS).
4. Load Balancers

[@big_tech_coach]

Thank you Mujtaba!

[@voidpointer398]

This was easily one of the best videos on availability patterns.
Thank You

[@big_tech_coach]

Thank you Jatin, that's very kind of you! 😋

[@ozobi2961]

Great teaching. I wish you had more views and support cause these are excellent.

[@big_tech_coach]

Thank you Oz, I will get there no worries!