a Node.js module for multi-core network serving.
Cluster is a Node.js module for multi-core network serving.
Questions tagged [node-cluster]
173 questions
699
votes
17 answers
Node.js on multi-core machines
Node.js looks interesting, BUT I must miss something - isn't Node.js tuned only to run on a single process and thread?
Then how does it scale for multi-core CPUs and multi-CPU servers? After all, it is all great to make fast as possible…
zaharpopov
- 16,882
- 23
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60
votes
8 answers
Puppeteer - Protocol error (Page.navigate): Target closed
As you can see with the sample code below, I'm using Puppeteer with a cluster of workers in Node to run multiple requests of websites screenshots by a given URL:
const cluster = require('cluster');
const express = require('express');
const…
LioRz
- 835
- 1
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23
votes
6 answers
how to keep variables that share all node processes in node cluster?
It seems like all the node woker processes are working as if it is executing a new copy of the same application. But would like to keep some variables that are shared by all node workers (child processes) in node cluster. Is there a simple way to do…
lahiru madhumal
- 1,185
- 2
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14
votes
1 answer
How to use nodeJS cluster with mySQL pool cluster?
Quick question
If I make a node cluster application with 4 workers (4 instances of my application), should I use mySQL pool or mysql pool cluster? If I use pool it will create one pool for each application but If I use pool cluster it will create 4…
prieston
- 1,426
- 2
- 18
- 39
12
votes
3 answers
How to run Node Cluster on windows?
Anyone know how to run Node Cluster on windows? I haven't been able to find any articles on the web and cannot seem to solve this problem:
events.js:160
throw er; // Unhandled 'error' event
^
Error: write ENOTSUP
at…
wayofthefuture
- 8,339
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- 53
11
votes
3 answers
How can I Handle Socket.IO rooms with cluster?
I have a server working with cluster and to make that work with socke.IO I am using sticky-session, but I have a problem with my rooms (I don't know if the way I did is the best option): The cluster is instantiating processes and each process has a…
Tiago Fabre
- 739
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- 18
10
votes
1 answer
How does node.js cluster module allow multiple child process to listen on the same port?
Using Node.JS and cluster module.
I am trying to understand how multiple forked child processes can listen on the same port.
For example, using cluster module we can do this:
const port = 443;
...
if (cluster.isMaster) {
for(let i = 0; i <…
Ryan Griggs
- 2,457
- 2
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7
votes
3 answers
Nodejs Clustering with Sticky-Session
const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
console.log(`Master ${process.pid} is running`);
// Fork workers.
for (let i = 0; i < numCPUs; i++) {
…
codefreaK
- 3,584
- 5
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7
votes
1 answer
Node Cluster: How to assign separate server/port to each worker?
I understand that I can use Nodes cluster module in order to create several workers all serving the same socket connection (example from docs):
var cluster = require('cluster');
var http = require('http');
var numCPUs =…
csvan
- 8,782
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7
votes
2 answers
Debugging stray uncaught exceptions (ECONNRESET) in a node cluster
In my node.js app which uses the cluster module, I'm intermittently seeing errors like this:
events.js:71
throw er; // Unhandled 'error' event
^
Error: read ECONNRESET
at errnoException (net.js:863:11)
at TCP.onread…
Matt Zukowski
- 4,469
- 4
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6
votes
2 answers
Scaling websockets/ws with multiple server instances
I am using websockets/ws on single machine. Its working fine. I want to scale it horizontally on multi-core and on multiple instances.
For mutli-core I tried with pm2 and it seems working great.
First Q: Is this the best approach or suitable…
Gagan
- 1,267
- 3
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6
votes
1 answer
100% CPU usage using clusters and mariaSQL, when cluster is exit and restarted
On my Node.JS app I'm using clusters to utilize my multi-core CPU. I'm using the node's mariasql library to communicate with my database. Since the node-mariasql library does not support pooling, I am using the third party - generic-pool to maintain…
Abijeet Patro
- 2,842
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6
votes
1 answer
node cluster with socket.io and expressjs
Here's my server code:
I'm trying to use cluster with socket.io and expressjs. I'm testing this on my quad core desktop.
var cluster = require('cluster')
var numCPUs = require('os').cpus().length
if (cluster.isMaster) {
// Fork workers.
for…
Harry
- 52,711
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5
votes
4 answers
node cluster.isPrimary is undefined
Node says that cluster.isMaster is deprecated and we should use cluster.isPrimary. But, while isMaster is returning me true without problem, I getting undefined when I try cluster.isPrimary:
const cluster =…
bahejam379
- 105
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5
votes
1 answer
Node.js Cluster Shared Cache
I'm using node-cache to create a local cache, however, the problem I have is that when using the application with PM2 which creates an application cluster the cache is created multiple times, one for each process - this isn't too much of a problem…
Tam2
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