Azure Event Hub throughput

Question

In the service high-level description Microsoft mentions that I can stream millions of events per second and it is highly scalable

Event Hubs is a fully managed, real-time data ingestion service that’s simple, trusted, and scalable. Stream millions of events per second from any source https://azure.microsoft.com/en-us/services/event-hubs/

But when I go to the official documentation the maximum throughput units (TUs) limit is 20, which translates into 1000 event per TU * 20 TUs = 20,000 events:

Event Hubs traffic is controlled by throughput units. A single throughput unit allows 1 MB per second or 1000 events per second of ingress and twice that amount of egress. Standard Event Hubs can be configured with 1-20 throughput units, and you can purchase more with a quota increase support request. https://azure.microsoft.com/en-us/services/event-hubs/

How does 20TUs translate into streaming millions of events?

Answer 1

The throughput capacity of Event Hubs is controlled by throughput units. Throughput units are pre-purchased units of capacity. A single throughput unit lets you: Ingress: Up to 1 MB per second or 1000 events per second (whichever comes first). Egress: Up to 2 MB per second or 4096 events per second.

Answer 2

You can increase 20-TUs by raising a support request.

But if you need to go very high you can also use Dedicated Clusters for Event Hubs.

Two important notes from the docs

A Dedicated cluster guarantees capacity at full scale, and can ingress up to gigabytes of streaming data with fully durable storage and sub-second latency to accommodate any burst in traffic.

At high ingress volumes (>100 TUs), a cluster costs significantly less per hour than purchasing a comparable quantity of throughput units in the Standard offering.

https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-dedicated-overview