Openfire Cluster for 10 million Concurrent User


I want to create a cluster that can handle 10 million concurrent user in Openfire. Is it possible?

What kind of system/Hardware configuration needed for that?

What are the plugin needed both open source and commercial license option?

Any use case document available?

Kindly share the details.

I am working with Zimbra and Openfire 4.0.2 and Spark 2.7.7 and SparkWeb 0.9.0

Thanks in advance