How to scale NodeJs applications using the cluster module.

In this video you will learn how to #scale #nodejs apps using the built in #cluster module. Its super easy to use and it will make your applications much faster and in turn your applications will have #zero-downtime. It will also automatically handle #load-balancing
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[@Mirzly]

Where were you a year ago when I first heard of this stuff and went on to figure it out on my own 😢

[@mafiacodes]

Subscribe like share

[@sayed_faixal]

Awesome 🔥 As mentioned in the description, every line was explained in a detailed manner.

[@soft4win619]

This is so cool, your explanation was superb, didn't knew a single thing about cluster, but was able to setup the whole thing with so much ease.

[@oneeminem2666]

This is just what I was looking for thanks man. Please post more core concepts like these. Great Work

[@sokoyaadedolapo5321]

Same here too, I've been looking for this type of example didn't see any, what I found is how they work not how to use them.

[@mdjahidulislam9205]

You are helping to do my app on production. Please make more videos like this so that we can learn real-life stuff.

[@rahulnautiyal4225]

Great explanation sir , I am watching your videos from last year now you are doing too good . I am following you from my 3 different id's. Great work keep going on .

[@azeemshah9501]

So good. It's a very good way to scale a simple application for starters.

[@himanshulal97]

that 's the reason i subscribed to your channel , thanks a lot bro thanku thanku thanku

[@pranavwani]

Thanks man for sharing important information!

[@jibanjyotinayak9359]

this is one of the awesome video on node cluter module on KZbin yet...

[@shashwatsingh253]

Best KZbin for NodeJS important topics.

[@missiontechdk6064]

outstanding explanation bro. Keep posting such quality content 🔥🔥

[@parasarora7565]

Nice tutorials, helping me alot. Keep uploading

[@mafiacodes]

Subscribe like share

[@mathearts9739]

Subscribed awesome explanation.

[@zakariasassi]

Amazing video , thanks bro

[@utsavojha2953]

Thanks for this awesome video 👍🏻

[@vellaikaagitham8401]

Thanks for clear explanation

[@gautiere-d9012]

Amazing tutorial, thank you

[@mafiacodes]

Glad you enjoyed it!

[@Dipenparmar12]

Amazing real world project tutorial.

[@trihargianto]

wow, such a great explanation 😃

[@kid_kulafu_1727]

Thank you man. I love you!

[@nandhakumar4817]

Clear explanation thanks

[@OmpalSingh-pw7mc]

Great work 👏

[@mafiacodes]

Thanks ✌️

[@samusaw]

very very great work

[@NirdeshPokhrel]

I only knew we can scale nodeJs server, but have never tried to do so. Thanks to you for making me(us) know scaling server in nodeJs. This is worth a subscribe.❤️☘️

[@kevalcharla9797]

Amazing Bro!!

[@ciroamore2129]

Truly Amazing :)!!!!

[@moose43h]

This is amazing

[@Inoinovation]

Great explanation bhai 👍❤️🔥

[@thetechrr]

Thank you man, you saved the day.

[@mafiacodes]

Glad to hear it

[@TechBoldy]

Super awesome video sir 💜❤💙

[@mafiacodes]

Subscribe like share

[@tejass817]

Very useful information.

[@mohitchauhan569]

very nice explain clustering

[@hardikmistry1661]

this was the great video sir 😎😎 i use compresion with cluster module and it give realy great result thans sir to make this awesome video. 👍🤩😍.

[@jeevanbhattarai4133]

great one

[@AjaySharma-vz9ei]

Superb 👐🏻👏🏻

[@firojsiddiki2750]

it is really a super useful video

[@syedshahzaibzafar2422]

great explanation.

[@student7743]

this video is awesome. but i stucked as you didn't tell where to use this loadtester?

[@abhijeetshikharvlog1444]

Good explanation

[@stylesg7818]

Interesting... Thank you

[@bosluk8806]

A nice solution that you can use for small projects. However, if you are looking for a solution for more complex projects, instead of this, you should run multiple node instances and put a load balancer in front of them.

[@mafiacodes]

Yes

[@paulojo720]

Pls how can I do that, is there any tutorial source you can provide to learn this 🙏, thanks

[@StLouis-yg8jp]

Why not have multiple node instances all using the cluster module? Wouldn't that be the most efficient?

[@hongphuc5497]

@@StLouis-yg8jp Because they would share the same memory on your EC2 (I mean the machine you run application), it's a drawback for ram intensive tasks.

[@Javedboqo1]

Nice tutorial Does clusters are still useful in recent Nodejs versions or is there any alternative of it?

[@saifulsync155]

great video

[@theervu]

Thanks

[@MRAMetharam]

Although the content here is superb, something else caught my eye! What did you have to install to have your comments use a different font?

[@PuneetThakkar7]

Excellent example

[@mafiacodes]

subscribe like share

[@nexus2056]

PHENOMENAL VIDEO BROTHER!! Mashallah!

[@SaiKumar-tg6ct]

Good explanation, please try to Make videoes on nodejs interview questions

[@greggord-hume3979]

I deploy to Heroku using a Hobby dyno and I have noticed my node project barely uses any CPU or RAM when stress testing. So i added more workers, because its only 1 cpu I had to hardcode a worker amount - i found 6 was good for my app. My requests per second and response times improved drastically - 6 fold you could say. I will now try cluster to see what happens but i think its the same thing... although its recommended to not do this and let Node handle the load, i cant help but notice adding workers and clusters utilizes more of the Servers resources and speeds up the response per second.

[@TechTillDawn]

Interesting

[@funnyclipz520]

This is good for vertical scaling and only if your machine has more than one CPU thread. If your CPU is single threaded one can also look into kubernetes. After understanding kubernetes pods you can see how beautifully they solved this problem on an infra level. Also great video bro!, keep em coming....

[@felixlabayen7861]

how kubernetes solves this in infra level?

[@MrRaj-qv7pg]

Good job bro. What is your keyboard name ?

[@brucebane7401]

amazing !!!!!

[@rahulr9539]

I would suggest installing nodemon as dev dependency or global dependency

[@cristianfonseca9404]

Great video.! Just a quick question the performance will be the same if I just run in the vps pm2 start -i max ????

[@mafiacodes]

Just that if u have 1 cpu only one instance and if cpu>1 then instances equal to cpus

[@linuxtubers7313]

Thanks. Which theme and font you're using?

[@sanyamarora3011]

Hi truly, could you please make a tutorial on how to use Typescript in Node projects . P.S You are a great Teacher.

[@mafiacodes]

Well I guess I will try sometime

[@RIAN8835]

you are awesome

[@channaveerhakari7319]

You can use PM2 to run your application in Cluster mode and also it servers as your process manager ie if your application by default crashes then it will be restarted automatically

[@nishantbhavasar5047]

yes or it has inbuilt load balancer also so it's a good approach then clustor module

[@vinaykumarkharwar177]

@@nishantbhavasar5047 using pm2 will start it in cluster mode also. You possibly will have to use load balancer and use pm2 to create different worker threads.

[@kishorindhe4891]

Great ♥️♥️

[@riteshthakur9250]

Amazing video but can we use this same idea on real time project like i already have a project so can i use this for fast performance in my project

[@mafiacodes]

Yes

[@the_taskmasterr]

Hey brother...i like the way you explain things...one doubt in this lecture is that how to apply this cluster module when we are using controllers and routes style of architecture...Hope you will reply my question🤞

[@the_taskmasterr]

@Not Top Voices thanks man i got it

[@DTUSEM]

Should we need to do load balancing after this also?

[@developer_01]

Hey what are you using to test the performance of your node application

[@sourikghosh2597]

what is the difference between forking and creating a new worker thread ??

[@SaiKumar-bu5ji]

For what kind of applications clustering API is ideal choice

[@souravvashisht7153]

Which is better scaling with Cluster create instance upto n number of logiacal core Or using Docker to create multiple container and using nginx as reverse proxy ?

[@mafiacodes]

Docker with nginx as reverse proxy

[@todaysmotivation9692]

Your fluency is awsome, just make your speed a bit slow - it will be great

[@castmonkeys7590]

very clean explanation, but wondering why we need to restart a worker after each request ?

[@mafiacodes]

No need

[@yesbit]

Just got this on my recommendation and I have a question, why kill the worker and fork another after each request ? Is there a performance benefit and what about the performance penalty in fork+kill code execution ?

[@andreadellamaggiora898]

Hello, are you using a special font for coding? if yes which is the name? I really like it. Thank you

[@mafiacodes]

operator mono

[@technoinfoworldwide2329]

i suppose to deploy my site in aws, should i need this node cluster module or aws load balancing is good?please share your thoughts which one is better

[@mafiacodes]

If u wanna pay use aws else you can do it urself like this or even with nginx

[@mohamad.elbohsaly]

How do you deal with cron job(s)? They get forked as well to nodes?

[@be_b_50_ankitkumar_singh79]

Sir , how to do if we have routes , like I mean in my project I have a routes folder in which multiple JS files are there and each of it contains GET request, in such case how to perform this?

[@rajendrah7316]

I am also looking for the same brother, did you get any information on this ? Is yes, could you please share some resources to study please ?

[@KallolMedhi]

Thanks for the amazong video but in my case I am getting the response from the same pid always, there is no round-robin happening

[@puspendumatilal6460]

I wish I could have a love reaction button.

[@parastouhashemi8620]

Great

[@mafiacodes]

Thank you

[@Pralyth]

I am getting the same results using 1 process as with 8. Both tests are finished in ~0.43 seconds and output ~2290 requests per second. Could this be due to it being such a simple program that it doesn't make a difference that I have multiple processes running on it? I have an Intel I5 8600 processor with 6 cores and ~4000mHz.

[@mafiacodes]

Can u share your code

[@mdabutalha3165]

Could you please make it using pm2 package?

[@abhijeetshikharvlog1444]

Please make video nodejs microservices

[@reactm]

can you please tell your vs code theme and font family you are using ?

[@mafiacodes]

Snazzy operator and Operator mono Subscribe like share

[@DeepakJangra-up8ek]

os.cpus().length will return the number of cores not threads (I beleive). So I have a few doubts 1. If I have 2 cores 4 threads cpu then will it be on full potential this way because it looks like it will create 2 proces only. 2. If I have to host say 3 apps on a 2 threads processor so how should it done. Should I create 2 processes for all 3 apps resulting in 6 total proces?

[@mafiacodes]

1. yes os.cpus().length gives u the number of cores, if I said something else its slip of my tounge. 2. You should only have the number of instances of you app === number of cores of a CPU 3. If you have a single core CPU then you should run 2 instances, so as to have Zero downtime, in the case one of the instances go down. Note: Regarding ur query about cores and threads, you can read this link and will provide you more insight about that and your question will be answered. www.quora.com/What-does-2-core-4-threads-mean-in-a-cpu-I-am-talking-about-this-cpu-ARK-Intel%C2%AE-Core%E2%84%A2-i5-520M-Processor-3M-Cache-2-40-GHz#:~:text=It%20means%20that%20the%20CPU,pipeline%20to%20process%20another%20thread.

[@DeepakJangra-up8ek]

@@mafiacodes By this link you mean ... ? PM2 cluster mode with command pm2 start app.js -i max creates 8 apps on my 4 core 8 threads processor and according to you 4 is best. It got me little confused here :/ and also Is your name really Truly (just asking) :|

[@mafiacodes]

Bro I can’t really come up with an answer since I have an old quad core i5 4670k, and pm2 only does 4 coz of 4 threads. In ur system what do u get for os.cpus.length? Coz what I did was in documentation. And yes my name is Truly.

[@DeepakJangra-up8ek]

@@mafiacodes OK. Now I am super duper confused on my i5 8250u (4 cores 8 threads) os.cpus().length gives 8.

[@mafiacodes]

Ok solved, it’s because since it’s hyper threading. U have a 4 core cpu with 8 threads, that means that for each core the os provided u with 2 virtual cores and therefore ur getting 8, for more info read wiki: en.m.wikipedia.org/wiki/Hyper-threading In the end a gr8 question and I think it will help out others also. Solved 💯

[@shahbankhan8844]

Please anyone tell me how to get that log test results

[@SaiKumar-tg6ct]

👌❤️

[@ankurgoel1638]

cluster module vs child process i am confused between them, cluster module uses cores of cpu while child processes? could you make a difference video? please

[@beefnuts2941]

i am new to this but I think cluster is just for making copies of the current app, but child processes could run a different app

[@shahbankhan8844]

What kind of terminal ur using I tried multiple time in cmd but it's not working

[@DTUSEM]

Create content like this you will get more views

[@mdjahidulislam9205]

Should i use pm2 or node cluster? Are they same?

[@mafiacodes]

Pm2 internally uses node cluster

[@rezaghifary3653]

thx for the tuto my friend, although i wanna ask what is benefits for killing the worker and fork a new cluster? why cant we just leave the workers without killing it eact time its called.

[@mafiacodes]

Killing workers is only for demonstration, and you don’t have to do it manually, only if it fails for some reason then a new worker will be spawned.

[@rezaghifary3653]

@@mafiacodes thats what i thought. thx

[@usama_khalid]

great video bro... when we use pm2 in cluster mode then we need redis to keep data same on every instance. Do we need redis etc when deploying node app using cluster module (fork).?

[@mafiacodes]

U need redis if u want to communicate between processes like for socket.io else u won’t need it.

[@navaneethpk3535]

i am able to fork only one worker despite having 4 cores. Any idea why?

[@saikumar-eh6df]

What is race condition in which cases it occurs, I have heard that using cluster module may cause for race condition.

[@mafiacodes]

I don’t think so, because it uses round robin approach

[@saikumar-eh6df]

@@mafiacodes Thanks

[@Omer-fr1ze]

Hello, something happened to me different than video, I do not know why only same process response all the time for every requests.(Before adding zero downtime property) Do I miss something? Great video btw!

[@Omer-fr1ze]

It is because in node v4.x and newer versions round-robin scheduling is disabled by default on Windows for performance reasons.Simply just add this code " cluster.schedulingPolicy = cluster.SCHED_RR; " if someone has same problem.

[@tahmidurrahman5119]

@@Omer-fr1ze thanks...it solved my issue

[@shaonahmed4961]

I have a lot of endpoints, do i have to kill the process on every one of them?

[@mafiacodes]

This is an example only, you don’t need to kill any process

[@shaonahmed4961]

@@mafiacodes Omg you replied. Thank you so much, great video as always!

[@sourikghosh2597]

Just asking , will these make our app statefull ???

[@mafiacodes]

All instances have their own state, if u want to use single state for all of them though not necessary use Redis pub sub.

[@ajmaln73]

so how do i use this with express code

[@knowhowitworks637]

how to get those benchmarks

[@ahlambeyoud1709]

this is so weird but when I use cluster module the application gets slower !!!! I get less requests per second, why is that?!

[@mafiacodes]

Well I know that, and that’s not real. Ur trying to load test a route which simply sends back a response directly (correct me if I m wrong), and now try to use a route which actually does something like db query and other stuff and then loadtest ur app.

[@symbianizemember6097]

Is it advisable to kill the worker in every process? In my case in every router.

[@mafiacodes]

Nooo, that’s only for demonstration

[@symbianizemember6097]

@@mafiacodes Okay, thank you :D

[@symbianizemember6097]

@@mafiacodes I'm curious about how to use the cluster in a socket io application? Is it a good idea to use both of them together?

[@mafiacodes]

Yes of course

[@fuadcs22]

Why do I have to kill the process?