CODEWITHSUNDEEP
azure-eventhub
J.B
J.B

Reputation: 147

Is there a limit to the number of consumers of an eventhub?

I know that the maximum number of ConsumerGroups we can have in an eventhub is 20, and the maximum number of partitions is 32. And with EventProcessorHost, there is only one active reader per ConsumerGroup per partition. So I wanted to know what is the maximum number of consumers reading simultaneously from an eventhub is possible.

Upvotes: 2

Views: 4119

Answers (1)

bidyut hota
bidyut hota

Reputation: 21

It is recommended to have a maximum of one consumer(belonging to one consumer group) processing events from one partition at one time. However, the Event Hub service supports a maximum of 5 consumers per consumer group concurrently receiving events from one partition. But obviously, since they are subscribed to the same partition and belong to same consumer group, they would be reading in the same data until each consumer maintains and reads from a different offset. You can refer to this article from Azure docs to confirm this.

Also this blog presents a nice code snippet to test out the same support of up-to 5 concurrent consumers per partition.

So for your figures, I think, theoretically, that would make => 20(consumer groups) *5(consumers per group) *32(partitions) = 3200 active consumer running concurrently.

Upvotes: 2

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