Is There a Limit on the Number of Client Connections to a Kafka Instance?

Yes. The maximum allowed number of client connections varies by instance specifications.

• If the bandwidth is 100 MB/s, a maximum of 3000 client connections are allowed.
• If the bandwidth is 300 MB/s, a maximum of 10,000 client connections are allowed.
• If the bandwidth is 600 MB/s, a maximum of 20,000 client connections are allowed.
• If the bandwidth is 1200 MB/s, a maximum of 20,000 client connections are allowed.