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
To. connect 1:1 with me: topmate.io/concept_coding
To contribute for the channel UPI id: shrayansh8@oksbi
Join this channel to get access to perks:
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#systemdesign #softwareengineer #interview #amazon #hld

[@kolasphoorti1030]

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?

[@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.

[@starsaran25]

​@@ConceptandCodingbut you made you others videos paid😢

[@xskrish]

nice way to start the weekend!

[@ConceptandCoding]

Thank you

[@mayanksingh5461]

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

[@ConceptandCoding]

Thanks

[@Lucifer-xt7un]

Quality at its best❤❤

[@ConceptandCoding]

Thank you

[@sachitsankhe5102]

Top notch quality content

[@ConceptandCoding]

Thanks:)

[@suranjanachattopadhyay4979]

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

[@ConceptandCoding]

:) sure will do.

[@manasnaik6904]

Me too, how to achieve active active for database sync.

[@sakshamsondhi2019]

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...✌ GodSpeed.......🚀

[@ConceptandCoding]

Thanks a lot buddy. Let's keep learning and sharing buddy

[@aryankumar488]

@@ConceptandCoding Please add more videos for HLD before LLD videos.

[@ravi-thestar8501]

thats the reason he is keeping some videos only for members :)

[@aviator1209]

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!!

[@ConceptandCoding]

Sure buddy:)

[@anjumanislamiachhatarpur7093]

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?

[@ConceptandCoding]

Ack of the question

[@harishdewangan-nu5tk]

Quality content delivered in simplest way 🫡

[@ConceptandCoding]

Thank you

[@suheabkhan2546]

Maza aagaya

[@ConceptandCoding]

Thanks

[@tejasshaha6629]

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 ❤

[@ConceptandCoding]

It's a configuration at Application layer.

[@mayurranjan9185]

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

[@ConceptandCoding]

Will do soon buddy

[@pulkitgupta4803]

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

[@ConceptandCoding]

Generally these Disaster Recovery Data centre takes very very less traffic and also Synchronisation from Live(primary) to Replica happens very frequently but it always has the possibility of reading stale data.

[@shaileshagarwal1]

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

[@ConceptandCoding]

One note

[@saurabhmittal6947]

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

[@TsarVladolfPutler]

What do you do when the Load Balancer itself fails?

[@thedatasciencelingo1239]

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

[@aakankashasharma1007]

I also have the same doubt. @conceptandcoding can you please help?

[@suhail_saifi_]

aafreen, bro plz make video on prototype LLD with code

[@ConceptandCoding]

Noted

[@ANSHULGUPTA880]

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

[@ConceptandCoding]

Yes in relational databases we can have Active Passive. ORACLE replicate data to secondary DB using OGG (Oracle golden gate) which help to transfer committed txns to multiple database. But it has one limitation that there can be delay of several minutes.

[@ANSHULGUPTA880]

@@ConceptandCoding Thanks for quick response. I am now a member :)

[@sumitbasu5146]

Number 200 viewer

[@ConceptandCoding]

Thanks for watching

[@piyushrana4693]

sir what happen if a load balancer itself goes down?

[@ConceptandCoding]

using Redunadncy and Failover mechanism it is resolved generally. Means, many load balancer with similar configuration are avaiable and there is a heartbeat check, if heartbeat check finds that the current load balancer is down, failover mechanism seemlessly transition from failed load balancer to new load balancer

[@subashreddy4993]

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

[@ConceptandCoding]

Sorry subash. If i am too much scrolling

[@JatinDixit-vc3qi]

Too much ads