What is the meaning of having kafka-sentry, when you don't have kerberos enabled? For the moment, Kerberos is the only authentication engine supported by Kafka. When you don't have Kerberos enabled, all connection are treated the same. As you can see from the log, it thinks that the username is ANONYMOUS, that's why it tries to find the group that this user belongs to. Since, the local system is not aware of any user (either local or synced to an LDAP/AD) with the name "ANONYMOUS", there is no group retrieved, so it cannot be matched to any kafka-sentry rule. It is normal that it will fail. Of course, you can create a user account "ANONYMOUS", assign it to a group and define a kafka-sentry rule with this group. But what is the meaning to that? All connections will have the same permissions.
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