[jira] [Created] (NIFI-5540) NiFi does not start in cluster mode without sensitive key explicitly defined

["Andy LoPresto (JIRA)" <ji...@apache.org>]

Andy LoPresto created NIFI-5540:
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             Summary: NiFi does not start in cluster mode without sensitive key explicitly defined
                 Key: NIFI-5540
                 URL: https://issues.apache.org/jira/browse/NIFI-5540
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.7.1
            Reporter: Andy LoPresto
            Assignee: Andy LoPresto


While the docs instruct users to explicitly set a value for {{nifi.sensitive.props.key}} in *nifi.properties* to use when encrypting sensitive component properties to persist in the *flow.xml.gz*, some users do not. Historically, these instances use a default, hardcoded key generation value. 

During the deprecation of {{StringEncryptor.createEncryptor(NiFiProperties)}} in NIFI-5376, the code which provided the default was missed in a specific cluster scenario. 

The default should be provided, and a warning should be printed to the app log if the provided key value is empty, in both standalone and cluster modes. 



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