bbende commented on PR #6984:
URL: https://github.com/apache/nifi/pull/6984#issuecomment-1440395671

   Also one more reference point is the description of the env var from 
nifi-env.sh
   ```
   # Set to false to force the use of Keytab controller service in processors
   # that use Kerberos. If true, these processors will allow configuration of 
keytab
   # and principal directly within the processor. If false, these processors 
will be
   # invalid if attempting to configure these properties. This may be 
advantageous in
   # a multi-tenant environment where management of keytabs should be performed 
only by
   # a user with elevated permissions (i.e., users that have been granted the 
'ACCESS_KEYTAB'
   # restriction).
   ```
   So the idea is if you set `NIFI_ALLOW_EXPLICIT_KEYTAB=false`, then you are 
forced to use a `KerberosCredentialsService` or `KerberosUserService`, so we 
can't make those invalid.


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