This is literally crazy podcast, I do not think i have finished any podcast without a break ever till this one arrived. A good start to the weekend. Thanks Arpit for doing this.
I was like I will watch for 10 mins till my snacks would be finished and now I am having dinner watching this. Man, please do more podcasts like these. Got to learn a different thought process . Thanks Subhash and Arpit !! I hope to see more such podcasts on the channel.
One of the best podcast. I can say this is asli engineering and Subhash is very confident and fearless, "Fatega to dekha jayega, Zarurat hi ku h, complex krna hi ni h" 😄and he literally shutdown the actual server for the demo. I learnt, do not over design the architecture, just see the data and build.
This discussion was really a gem, from my experience what i have observed is when people talk about response time, everyone gets so defensive that the first point of check is either code, or query run time, adding multiple indexes to make the the query run faster, but we easily ignore the network calls most of the time. Some great take aways from this discussions for sure.
Amazing ! In my recent experience working in a similar company to Dukaan but for the Middle East region. They have struggled alot to reduce the cost of AWS bills, this is the real pain for startups. Eye opener this is called "Asli Engineering" hats off, we need more podcasts with Subhash .. Already a fan of him
Man this video is insane. I thought I'll watch first 30 mins or so and sleep. But I couldn't skip any single minute. I've literally been doing engineering for last few years but it was all about writing code and code level optimisations but no one ever talks about these optimisations from the perspective of costs, thinking in such a way from first principles is really 'Asli Engineering'. From the insights from Subhash to the insights from Arpit at the end. It was super amazing. Ive never commented on any youtube video before, creating a channel just to comment on this one. Subscribed to your channel as well. Amazing video loved it!
I'm less knowledgeable to this topic. So 10pm k around video start kiya aur 1:11am ho rha hai. 1hr 37 min ka video ko dekhne mai itna time laga... so many thing for me to know. bahut se unknown terms ko google search kr kr ke dekhna pada.learned many things. Plz keep it up !
I work for a cloud provider so this is counter intuitive to I profess in general. However, the simplicity and ease with which Dukaan manage their infrastructure is amazing. My favorite thing was Subhash's enthusiasm for all this and how he takes pride in his tech work, truly inspiring! I only worry about rapid scaling ability in future, however if the company doesn't project such an exponential growth, then this would work well for a foreseeable future.
Completing it at 2:30am. I got so much to learn that I don’t know if I will get to sleep tonight or not. Amazing one man. Just happily overwhelmed & I am stunned looking at u guys. I’m 20 but now I want to learn & experience all these cool stuffs. Great video Arpit Bro ❤❤❤
What a brilliant podcast! Didn't shy from disclosing the real numbers... no one want's to find out the hard way. You and Subhash are proper engineers and I loved listening to you two talk technology. I've been a generalist for about 20 years, but love to experiment. I've learnt to setup servers etc. only since covid. So while my knowledge is surface level compared to you'll it was interesting to know that my learning is in the right direction. And just like you, i was astonished with the IOPS difference! Anyway, thank you for a wonderful podcast.
I don't know you, I don't know this guy. I clicked on the video just by reading "Dukan". As an early stage engineer myself, this is a gem 💎 podcast on devops and cloud infrastructure. Got a lot of insites. Totally worth it my time! Looking for more valuable content like this now! ❤ 🔥
This is a magical discussion!!! Man, this is an awesome podcast. I have Subscribed to the channel and turn the notifications ON, and kept shooting such podcasts. Really knowledgable.
Subhash's approach towards the problems and their solutions and preparedness is just awesome. I very rarely comment on any videos but on listening to his realistic approach prompted me to comment. Really impressed by the unencumbered way of thinking. All the best to Dukaan and Kudos to "Asli Engineering by Arpit Bhayani" for this interaction.. 👍
he single handedly destroyed Devops Engineers/SRE/GCP/AWS (with facts and data of course). But what a nice podcast full of TECHNICAL depth along with real time examples that he have shown. My Key takeaways : 1. Learn KUBERNETES ! {will try to become the 5th SRE/Infra guy at DUKAAN} 2. Any system no matter how reliable , FATEGA ! 3. Cloud vs On-prem (IOPS performance comparison)
@@yash_renaissance_athleteBhai most devops wala people I know can do run bare metal infra as well. Usually cloud ko padhne se pehle system handle krna aana hi chahiye. It's not really a big deal, most companies are moving some services to bare metal. Ye kaam bhi devops wale hi krenge
@@yash_renaissance_athlete not actually destroyed , destroy would be a little harsh word , but the need and use of a big devops/SRE team vs 3-4 guys who actually knows how to handle big infrastructure,(be it On-Prem vs cloud) and get stuff done.
@@animeshsingh4290 toh wahi toh mai bhi maanta hoo, but the main comment poster said “he destroyed devops engineers” and that’s why I asked him how did he destroy them
No.. he didn't.. He is just working with trade offs.. for some companies the traffic is so huge that they cannot afford the downtime with critical transactions.. and that downtime he doesn't care.. and basically managing 10 different other free services instead of using mainstream cloud.
good interview, reminds me of my early days in startup, when our high-end server at datacenter crashed, and all the backup was on my laptop in office, went to datacenter and i had to put the laptop in datacenter and run the business, surprisingiy laptop was in datacenter for 8 months, as we couldnt fix the highend machine as it was assembled and had multiple issues..
16:16 sums it up. This is great for a talk show and an engineering project. Especially for a retail focused startup, if you want to become a unicorn and then go for IPO, moving out of cloud is not a great strategy. Hybrid is the way to go.
the moment he mentioned $1500 I was shocked, I've worked on both on-prem and cloud, currently working on the performance side of the applications but with these insights I will always check the underlying hardware as well.
Bhai, meri shuruvat ese hi hardware si hui thi, bad me cloud me move kiya and started focusing there. But this gives me enough confidence to continue on hardware. Already downloaded video for reference purposes.
Subhash is very practical. Appreciate his approach to reduce costs while taking ownership of certain additional things that developers often want to skip these days. What I don't agree on the reliability aspect though is that although downtimes are ubiquitous across all infra services, you have to look at the normalised statistics. The extent of care aws takes to make sure there is always a fallback is likely much higher than a smaller player can afford. But of course, there's always the cost tradeoff and if it works out for Dukaan, that's awesome.
There is a reason behind high expense charges from these big cloud companies . They invent technologies. Docker and Kubernetes was backed by google . Open source is not free. Single command chalake instances spink karna was not possible few years ago. Google invested money in both docker and Kubernetes. So when you pay cloud bills it’s just not billing charges. it also includes R&D for current and future projects.
I liked this perspective lekin ye bhi socho ki why would they invest in open source? It's definitely not because they are so generous and want people to give open source alternatives of their products, if they invest it's because of their interest. They heavily use open source in their "big companies" and their investment is merely "giving back to the community" if not entirely their business interest.
but he has to take care of his own bottomline and his own business. I’m sure nobody biz or consumer including Google would care if he’s making poor business decisions to be socially right
Damn !!! This is insanely good discussion ... Absolutely loved it !!! Subhash proved that we can have full control of our Infra instead dumping loads of money into Cloud vendors !!! This was real fun ... keep them coming !!!
Aree yaar kitna interesting hai ye sab. Makes me want to understand what are these technologies these guys are talking about and indulge in conversation.
Whenever you hear a new term, Google search and spend time understanding. Once you have understood decent concepts, revisit the video. There are so many interesting things and concepts we talked about. You will have fun if you are genuinely curious about it. All the very best!
very nice podcast, the people of my generation who started their career from cloud era only couldn't compare the bare metal and cloud performances and this is eye opening thing to see. great subhash sir
Bro this is really dope podcast. Subhash is genius guy.. Never saw such a simple thinking can solve a big problem. Thanks Asli Engineer for doing this podcast. I became a fan of Subhash Chaudhary from now.
57:00 shows how government policies impact business mindset. If it was EU or other regions, the regulatory body would mandate few hundred days of data. Shows how talented we are... English is just a medium of communication and not a req to be in technical domain. Brilliant interview.
Question to Subhash: When you say you are doing read replica of Postgres to cloud and in case your on-prem db services is down, you will still serve it via cloud that means you have allowed writes to that cloud database or your application will work only in read-only mode until you bring back your on-prem services? If you allow write to cloud database, how you bring that delta back on your on-prem services?
We would like to see more of this kind of in-depth sessions it was really awesome to watch you guys. Showing the internal infra setup on RUclips was the highlight. Bring more of these kind of stuff.
Bhaisahab.. bawal kaat diye hain ekdum 😆 Kudos to Subhash for thinking in a very different and very realistic approach. Loved the podcast. and best of luck to you arpit for your analytical db endeavour 😀
Great and insightful podcast. I have couple of doubts - 1. Why do they have servers all over the world when their sellers and users are only in India? 2. For all the servers spread across the world, won't they have to connect with one single db in a particular region (or do they have read-replicas in each region)?
Just for fun, I brought all my old PCs; one of them is running Nginx primarily for load balancing and reverse proxy, while the rest are running Express.js instances, Jellyfin, Nextcloud, and others (In docker of course). In my server, I do serve recorded videos for local coaching centers. But backing up your data is important.
Great podcast. It’s real stuff. Liked it a lot. Great if you do these similar ones from experts. May I ask one question, you mentioned why Kafka is fast. Can you please in details or give me some reference.
This is truely an insane podcast!
Subhash by default speaks in 1.5x
His brain works faster than his speech
yep. I wanted to watch in 1.25x or 1.5x but couldn't understand him
i had to listen on .75 to understand
I literally checked if I’m on 1.5x
Same..instinctively i put the video on 1.5x as soon as it started but had to switch back once he started speaking 😂
This is peak of youtube! SO MUCH KNOWLEDGE in a SINGLE VIDEO!
This is literally crazy podcast, I do not think i have finished any podcast without a break ever till this one arrived. A good start to the weekend. Thanks Arpit for doing this.
Same, 1st podcast I completed.
I hope Arpit bring more content like this (not necessarily in podcast) but practical hands on for "asli engineering"
Man he is knowledgeable and confident enough to show the inside workings of his company.
Really respect him
Bro this cto is dope.... knowlege...curiosity....fearlessness...man insane... kudos to him...Thank you Arpit bhaiya for this podcast
Never saw a world class dev process explained in plain Hindi like this before . Also please see if sensitive info is not being shown. ❤
What an amazing podcast!!! Subhash sir is just on another level. Loved it throughout.
I was like I will watch for 10 mins till my snacks would be finished and now I am having dinner watching this. Man, please do more podcasts like these. Got to learn a different thought process . Thanks Subhash and Arpit !! I hope to see more such podcasts on the channel.
One of the best podcast. I can say this is asli engineering and Subhash is very confident and fearless, "Fatega to dekha jayega, Zarurat hi ku h, complex krna hi ni h" 😄and he literally shutdown the actual server for the demo. I learnt, do not over design the architecture, just see the data and build.
This discussion was really a gem, from my experience what i have observed is when people talk about response time, everyone gets so defensive that the first point of check is either code, or query run time, adding multiple indexes to make the the query run faster, but we easily ignore the network calls most of the time. Some great take aways from this discussions for sure.
Amazing ! In my recent experience working in a similar company to Dukaan but for the Middle East region. They have struggled alot to reduce the cost of AWS bills, this is the real pain for startups. Eye opener this is called "Asli Engineering" hats off, we need more podcasts with Subhash .. Already a fan of him
It's great to see.
Which firm is that
This CTO is amazing! Very inspiring and logical and keeps things simple! Ankit thanks for bringing this, looking for more
It's been great working with Subhash. Really glad to be a part of his impressive operation.
Great grip on his domain , a real guru .. love from Pakistan....
Man this video is insane. I thought I'll watch first 30 mins or so and sleep. But I couldn't skip any single minute. I've literally been doing engineering for last few years but it was all about writing code and code level optimisations but no one ever talks about these optimisations from the perspective of costs, thinking in such a way from first principles is really 'Asli Engineering'. From the insights from Subhash to the insights from Arpit at the end. It was super amazing. Ive never commented on any youtube video before, creating a channel just to comment on this one. Subscribed to your channel as well. Amazing video loved it!
I recognize this writing
I'm less knowledgeable to this topic. So 10pm k around video start kiya aur 1:11am ho rha hai. 1hr 37 min ka video ko dekhne mai itna time laga...
so many thing for me to know. bahut se unknown terms ko google search kr kr ke dekhna pada.learned many things. Plz keep it up !
This man has what a clear understanding of thoughts... really impressed to know how things work.
India is going to eat the competitionin coming future.
We need more such engineers! 🙏
One of the best tech podcast which talk real to the ground. sidhi baat no bakwas. Many learning hidden for new startup founder and CTOs.
The guy gave a thorough overview of GitOps, ArgoCD, and Kubernetes principles. This video is more a tutorial than a podcast. ❤
I work for a cloud provider so this is counter intuitive to I profess in general. However, the simplicity and ease with which Dukaan manage their infrastructure is amazing. My favorite thing was Subhash's enthusiasm for all this and how he takes pride in his tech work, truly inspiring!
I only worry about rapid scaling ability in future, however if the company doesn't project such an exponential growth, then this would work well for a foreseeable future.
Even though I didn't want to I had to pause the video and then like it before being mesmerized again 🔥🔥🔥
Completing it at 2:30am. I got so much to learn that I don’t know if I will get to sleep tonight or not. Amazing one man. Just happily overwhelmed & I am stunned looking at u guys. I’m 20 but now I want to learn & experience all these cool stuffs.
Great video Arpit Bro ❤❤❤
What a brilliant podcast! Didn't shy from disclosing the real numbers... no one want's to find out the hard way. You and Subhash are proper engineers and I loved listening to you two talk technology. I've been a generalist for about 20 years, but love to experiment. I've learnt to setup servers etc. only since covid. So while my knowledge is surface level compared to you'll it was interesting to know that my learning is in the right direction. And just like you, i was astonished with the IOPS difference! Anyway, thank you for a wonderful podcast.
my first podcast ever, and its full of knowledge.
This was a really good podcast, Arpit. As an old IT guy, I always knew self hosting is cheaper. But these insights from founder were phenomenal.
Maza aa gya, soo much depth shared in a way like chai sutta aur charcha. Appreciate Subash for sharing things so transparently ❤
I'm not even a CS engineer but I am all here for this kind of content.
Great work Dukaan team, one of the best podcast out there. Keep posting 💥💥💥
ok pranav
The shock i got when i heard the COST difference! Man hats off!
Amazing CTO with tonns of knowledge and daring. Looking forward to work with him.
This is truly “Asli Engineering” ❤
hatsoff to the dukkan's founder..that deep insight will help people like us who are self taught
Are mere bhai…🤯🤯 itni humbleness..❤️❤️❤️
You Indians are gold-mine of knowledge. Love you both from across the border.
This was an amazing podcast. Hats off to how Subhash so easily touched so many aspects of Infrastructure.
Podcast can't get more involved , inspiring , impactfull. Just Loved IT. Shubash is just a great guy. Thanks Arpit for putting this out here
I don't know you, I don't know this guy. I clicked on the video just by reading "Dukan". As an early stage engineer myself, this is a gem 💎 podcast on devops and cloud infrastructure. Got a lot of insites. Totally worth it my time! Looking for more valuable content like this now! ❤ 🔥
Hats off you guys, literally I loved them this is what our Indian Software developer community needs ❤❤
pure knowledge..pure passion !!
no doubt why this video is most viewed in this channel..
This is a magical discussion!!! Man, this is an awesome podcast. I have Subscribed to the channel and turn the notifications ON, and kept shooting such podcasts. Really knowledgable.
I hope they make a similar episode when they go back into the cloud.
He is so incredibly honest. Lovely talk.
Asli Desi Engineering, hats off to you guys 👌👌
That’s what we call engineering, dekhte hai kya hota hai, kya fatega
Should have more such podcasts
Thanks guys for this discussion. Aaj neend achi aayegi. Invaluable insights from Shubhash !
Subhash's approach towards the problems and their solutions and preparedness is just awesome. I very rarely comment on any videos but on listening to his realistic approach prompted me to comment. Really impressed by the unencumbered way of thinking. All the best to Dukaan and Kudos to "Asli Engineering by Arpit Bhayani" for this interaction.. 👍
he single handedly destroyed Devops Engineers/SRE/GCP/AWS (with facts and data of course).
But what a nice podcast full of TECHNICAL depth along with real time examples that he have shown.
My Key takeaways :
1. Learn KUBERNETES ! {will try to become the 5th SRE/Infra guy at DUKAAN}
2. Any system no matter how reliable , FATEGA !
3. Cloud vs On-prem (IOPS performance comparison)
lol how did he destroy devops engineers
@@yash_renaissance_athleteBhai most devops wala people I know can do run bare metal infra as well. Usually cloud ko padhne se pehle system handle krna aana hi chahiye. It's not really a big deal, most companies are moving some services to bare metal. Ye kaam bhi devops wale hi krenge
@@yash_renaissance_athlete not actually destroyed , destroy would be a little harsh word , but the need and use of a big devops/SRE team vs 3-4 guys who actually knows how to handle big infrastructure,(be it On-Prem vs cloud) and get stuff done.
@@animeshsingh4290 toh wahi toh mai bhi maanta hoo, but the main comment poster said “he destroyed devops engineers” and that’s why I asked him how did he destroy them
No.. he didn't.. He is just working with trade offs.. for some companies the traffic is so huge that they cannot afford the downtime with critical transactions.. and that downtime he doesn't care.. and basically managing 10 different other free services instead of using mainstream cloud.
19:00 Bachhe log hai... That's truly the nicest thing I heard today...
This is the best engineering podcast I have ever seen in my life! Inspirational!! ❤
This is Tanenbaum's book done bottoms up. Great talk, insight, guts and engineering.
Does that book also cover these kinds of topic? I didn't read that much. But IIRC, it was about the computer stack bottom up
My mind is blown , got to learn so many stuff my brain can't handle!!
good interview, reminds me of my early days in startup, when our high-end server at datacenter crashed, and all the backup was on my laptop in office,
went to datacenter and i had to put the laptop in datacenter and run the business, surprisingiy laptop was in datacenter for 8 months, as we couldnt fix the highend machine as it was assembled and had multiple issues..
Absolutely brilliant discussion. So much information in one video! Just run the video on 0.75x. 🙂
16:16 sums it up. This is great for a talk show and an engineering project. Especially for a retail focused startup, if you want to become a unicorn and then go for IPO, moving out of cloud is not a great strategy. Hybrid is the way to go.
Its real gem, loved it Arpit and Subhash. Anticipating more.
Duniya gol hai !! Ek jagah pe din hota hai, Ek jagah pe raat hota hai, Wow :)
The proxying logic was amazing
the moment he mentioned $1500 I was shocked, I've worked on both on-prem and cloud, currently working on the performance side of the applications but with these insights I will always check the underlying hardware as well.
Great Podcast, very enlightening even to someone who has very less knowledge about cloud Kudos to both 👏
Bhai, meri shuruvat ese hi hardware si hui thi, bad me cloud me move kiya and started focusing there. But this gives me enough confidence to continue on hardware.
Already downloaded video for reference purposes.
This guy knows his stuff, awesome...
Subhash Choudhary has a new fan.
Kya confidence hai!!!! Zabardast.
What a Genius strategy. Kya load balancing ka strategy socha hai.
This is the first channel to which I have subscribed while watching this video.
Knowledgable! I am also working on my startups it could give new startups a knowledge of future and critical thinking about their systems. Great!
Insane. Hands down the most entertaining and enlightening podcast I have ever seen.
Subhash is very practical. Appreciate his approach to reduce costs while taking ownership of certain additional things that developers often want to skip these days. What I don't agree on the reliability aspect though is that although downtimes are ubiquitous across all infra services, you have to look at the normalised statistics. The extent of care aws takes to make sure there is always a fallback is likely much higher than a smaller player can afford. But of course, there's always the cost tradeoff and if it works out for Dukaan, that's awesome.
Subhash bhai is Asli Engineer, forget about system design jargons.. he is living system design😇
This is 🔥🔥. Didn't expected that this will change my entire though process. The content of this podcast is of worth entire eng. degree.
There is a reason behind high expense charges from these big cloud companies . They invent technologies. Docker and Kubernetes was backed by google . Open source is not free. Single command chalake instances spink karna was not possible few years ago. Google invested money in both docker and Kubernetes. So when you pay cloud bills it’s just not billing charges. it also includes R&D for current and future projects.
I liked this perspective lekin ye bhi socho ki why would they invest in open source? It's definitely not because they are so generous and want people to give open source alternatives of their products, if they invest it's because of their interest. They heavily use open source in their "big companies" and their investment is merely "giving back to the community" if not entirely their business interest.
but he has to take care of his own bottomline and his own business. I’m sure nobody biz or consumer including Google would care if he’s making poor business decisions to be socially right
I liked the person more than the pod cast, just after watching 5 minutes
I am flattered by this podcast. Thanks Arpit for this podcast. One of the most amazing podcast i have got lots of learnings from..
from a random recommendation landed on this and 20 mins of video made me subscribe you
Damn !!! This is insanely good discussion ... Absolutely loved it !!! Subhash proved that we can have full control of our Infra instead dumping loads of money into Cloud vendors !!! This was real fun ... keep them coming !!!
Etne acche se tho mereko mere company walo ne bhi on-board nai kiya tha😂😂 awesome podcast❤
Aree yaar kitna interesting hai ye sab.
Makes me want to understand what are these technologies these guys are talking about and indulge in conversation.
Whenever you hear a new term, Google search and spend time understanding.
Once you have understood decent concepts, revisit the video. There are so many interesting things and concepts we talked about.
You will have fun if you are genuinely curious about it. All the very best!
@@AsliEngineering Ah, understood. Thank you for the reply, I'll definitely do that.
I am planning the same, I spent 5 years learning about deploying on-premises servers now it's time to use it.
Good one - Arpit, I was same thought and this bost my thoughts and lot of practical and proven insights form Subhash, Thank you
Shubahsh Chowdhury is love yr he inspired me a lot for tech or he is a reason of my tech passion
This was pure awesome. Loved every second of it ❤.
very nice podcast, the people of my generation who started their career from cloud era only couldn't compare the bare metal and cloud performances and this is eye opening thing to see. great subhash sir
Subhash - the legend. thanks for making Dukaan
Bro this is really dope podcast. Subhash is genius guy.. Never saw such a simple thinking can solve a big problem.
Thanks Asli Engineer for doing this podcast. I became a fan of Subhash Chaudhary from now.
57:00 shows how government policies impact business mindset. If it was EU or other regions, the regulatory body would mandate few hundred days of data. Shows how talented we are... English is just a medium of communication and not a req to be in technical domain. Brilliant interview.
Wow, this is really good conversation.
Thank you Subhash for being so open.
Question to Subhash: When you say you are doing read replica of Postgres to cloud and in case your on-prem db services is down, you will still serve it via cloud that means you have allowed writes to that cloud database or your application will work only in read-only mode until you bring back your on-prem services? If you allow write to cloud database, how you bring that delta back on your on-prem services?
you've earned a subscriber by introducing me to a new type of podcast. The cocktail of education and interview is very refreshing.
This channel is underrated and this content is Gold
very informative, we want more content like this. And thanks to Subhash sir for sharing such an amazing info
bhai do excited bachche khel rhe h and khush h - this is the vibe of the podcast.
Maza aagya !
Keeping it simple stupid !
Very informative video man, would love more of such videos/podcasts. Thanks 👍
There are more than 160 such videos on my channel. Do go through them. I have covered deep engineering concepts and real world systems.
@@AsliEngineering Oh, I will go through, Thanks 👍
I am DevOps Engineer this guy almost concluded my entire job in just 1 and half hours😅😅
We would like to see more of this kind of in-depth sessions it was really awesome to watch you guys.
Showing the internal infra setup on RUclips was the highlight.
Bring more of these kind of stuff.
Bhaisahab.. bawal kaat diye hain ekdum 😆
Kudos to Subhash for thinking in a very different and very realistic approach. Loved the podcast. and best of luck to you arpit for your analytical db endeavour 😀
Thank you Deependra 🙌
great knowledge source , both of you guys are amaziing , as a backend senior dev , learned a lot , thanks for this session!
Great and insightful podcast. I have couple of doubts -
1. Why do they have servers all over the world when their sellers and users are only in India?
2. For all the servers spread across the world, won't they have to connect with one single db in a particular region (or do they have read-replicas in each region)?
To maintain redundancy?
That's what I think.Even I'm interested in knowing more.
I think all of those servers are served from a single DB in India.
Just for fun, I brought all my old PCs; one of them is running Nginx primarily for load balancing and reverse proxy, while the rest are running Express.js instances, Jellyfin, Nextcloud, and others (In docker of course). In my server, I do serve recorded videos for local coaching centers. But backing up your data is important.
Did you provide ABR streaming locally?
This is what we call asli podcast!!
Great podcast. It’s real stuff. Liked it a lot. Great if you do these similar ones from experts. May I ask one question, you mentioned why Kafka is fast. Can you please in details or give me some reference.