15. Design High Availability & Resilience System, HLD | Active Passive & Active Active Architecture

This question in interview can come with different ways like :
Design High Availability System,
Active Passive and Active Active Architecture,
Design High Resilience System,
How to achieve 99.999% Availability

Chapters:
00:00 - Introduction
02:28 - Single Node and Issue with it
05:55 - Multi Node Types
06:38 - Active Passive Architecture with its Pros and Cons
20:00 - Active Active Architecture with its Pros and Cons
26:22 - About Next Video

Join this channel to get access to perks:

#systemdesign #softwareengineer #interview #amazon #hld

[ADITYAKUMARking]

Just went through whole video. Quality content.Gained lot of knowledge. Thanks for this. Student/Engineer spends lot of money for this education. You are doing this for free. Please let me know what can I do for you.

[sakshamsondhi]

Sir, ap itne ache kaise ho sakte ho...😊

Thanks for such top notch content.

Proud to say I am also an NITian, will try to catch u up...✌

[mayanksingh]

Really well explain.. Even someone how is starting video from from basic they can understand this concept

[suranjanachattopadhyay]

Hi Shrayansh, waiting for you to cover the DB synchronization concept of Active-Active system.

[kolasphoorti]

Hey Shreyansh, how does data sync happen in active-active? I am not asking about algos or how it resolves data when there is conflict but I am thinking more on side of how communication happens between servers I believe it is asynchronous but as u mentioned in dynamo db video it has to wait for atleast one of the servers to sync up. Does it use websocket protocol? because https synchronous means waiting and asynchonous cannot get acknowledgement from the replicas?

[tejasshaha]

Let's say in Active-Passive DB-1 is down and we need to redirect traffic to DB-2 so here who takes care of redirecting traffic, is it manual process or some automated scripts are there ?

Thanks sir for wonderful video ❤

[aviator]

Thanks a lot for creating these videos, these have been very helpful, just one request, can u plz make more of these videos at a little bit higher rate? as a lot of ground is still left to cover. Thanks!!

[saurabhmittal]

isn't this a subset problem which we have already solved in design of key value store ?

[mayurranjan]

When will you upload syncup video?
I am eagerly waiting for that. And really thanks for your help 🙏

[anjumanislamiachhatarpur]

Nice explanation, understood the underlying concept.

I have a question regarding the choice of CASSANDRA DB in Active-Active Architecture:
As per the earlian lectures on the CAP theorem, Cassandra provides us high availability, and partition tolerance but not immediate consistency, on the other hand we have MONGO DB which provides Consistency and Partition Tolerance but not High Availability.
Both are NoSql DBs and can be used for Multi-Master Architecture. So basically in our case how we are deciding which DB to choose in ACTIVE-ACTIVE architure.?
Could you please reply in your mean time?

[pulkitgupta]

in active passive when only read happens in DC2 DB how can we maintain data consistency or synchronisation between both DB as the sync only happens when write comes to DC2 DB

[thedatasciencelingo]

hey Shreyansh, in active passive setup if my application does write and then immediate read there would a risk of data not synced by that time, so how do we reaolve these conflicts

[piyushpathak]

I always has 1 doubt that we include loadbalancer as single server can't server 1 million request than how 1 loadbalancer is serving 1 million request?? technically it is also a server.

[TsarVladolfPutler]

What do you do when the Load Balancer itself fails?

[suhail_saifi_]

aafreen, bro plz make video on prototype LLD with code

[ANSHULGUPTA]

Can we make Active Passive DBs in relational databases? how Oracle will replicate data to secondry db??

[harishdewangan-nutk]

Quality content delivered in simplest way 🫡

[shaileshagarwal]

Excellent.. can you help me with which editor it is to draw architecture components?

[subashreddy]

At times it is zoomed in and scrolling to the top, so forgetting the full picture of flow