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# Cluster Planning

## Node Spec

Empirical size configs for Celeborn nodes
The principle is to try to avoid any hardware(CPU, Memory, Disk Bandwidth/IOPS, Network
Bandwidth/PPS)becoming the bottleneck.
The goal is to let all the hardware usage be close to each other, for example let the disk
IOPS/Bandwidth usage and network usage stay roughly the same so that data will be perfectly
pipelined and no back-pressure will be triggered.

The goal is hard to reach, and perhaps has a relationship with workload characteristics, and also
Celeborn’s configs can have some impact. In our former experience, vCores: memory(GB):  Bandwidth(
Gbps): Disk IO (KIOps) is better to be 2: 5: 2: 1.
We didn’t thoroughly conduct experiments on various configs(it’s hard to do so), so it’s merely a
reference.

## Worker Scale

You need to estimate your cluster's max concurrent shuffle size(ES), and get the total usable disk
space of a node(NS). The worker count can be `(ES * 2 / NS)`.