jiazhai opened a new issue #3491: support kerberos authentication URL: https://github.com/apache/pulsar/issues/3491 **Is your feature request related to a problem? Please describe.** Currently both Zookeeper and BookKeeper could be secured by using Kerberos, It would be good to support Kerberos in Pulsar Broker and Client. And some user also want it. **Describe the solution you'd like** In Pulsar code, we already have [AuthenticationProvider](https://github.com/apache/pulsar/blob/master/pulsar-broker-common/src/main/java/org/apache/pulsar/broker/authentication/AuthenticationProvider.java) interface in broker side, and [Authentication](https://github.com/apache/pulsar/blob/master/pulsar-client-api/src/main/java/org/apache/pulsar/client/api/Authentication.java) interface in client side. So the main work is to implementation these 2 interfaces and related classes above for Kerberos. **Additional context** Add any other context or screenshots about the feature request here.
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