Perfomance & ScalingLesson 87Free preview

Cluster Module

This lesson is part of Node.js · All levels

Summary

This lesson discusses cluster modules that allow a single application to run on multiple processes to utilize the entire CPU core. Because they are single-threaded per process, clusters are a major way to increase server throughput. You'll learn primary/worker, connection scheduling, and dealing with dead workers. (Node.js)

Key points

The cluster module runs one instance of an application in multiple processes (worker) on all cores.
The parent process is called primary (formerly master); the rest is worker.
The default method of deploying the connection is round-robin (OS on Linux).
'Exit') to know the worker is dead; primary should be immediately fork back.
Use the graceful shutdown and wait for the connection to be complete before leaving.

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