Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/754
@joewitt all looks good tested on standalone and on cluster including tests
ensuring precedence on attribute lookup was maintained. Also negative
integration test for non existent files ran without issue.
Recommend to note in documentation that with the current implementation the
concept of cluster scope vs node scope is not yet available therefore each node
in a cluster environment would need to be configured with the same custom
properties to ensure any matching expected across the cluster.
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