Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/2552
@markap14 do you think it makes sense to update the default
nifi-env.sh/.bat so that the environment variable is already there (defaulting
to allow) and can easily be toggled?
https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-resources/src/main/resources/bin/nifi-env.sh
Something like:
```
# Set to false to force the use of Keytab controller service
export NIFI_ALLOW_EXPLICIT_KEYTAB=true
```
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