Github user mauriziocolleluori commented on the issue:
https://github.com/apache/nifi/pull/1148
I have recompiled and added expression language support (with expected
evaluation on read) for both principal and keytab. However when I add any
expression language to one of such attributes (in a Hive or HDFS processor on a
kerberized Nifi instance) a tooltip says that the attribute has not been set.
It looks like some UI validation is still not recognising the expression
language as valid. How do I overcome this problem? Thank you.
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