[jira] [Created] (NIFI-891) Provide mechanisms to handle processors that do not take input connections

["Aldrin Piri (JIRA)" <ji...@apache.org>]

Aldrin Piri created NIFI-891:
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             Summary: Provide mechanisms to handle processors that do not take input connections
                 Key: NIFI-891
                 URL: https://issues.apache.org/jira/browse/NIFI-891
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework, Extensions
            Reporter: Aldrin Piri


This is the "other half" of functionality of NIFI-810.  

Some processors (typically those providing List, Get, Listen functionality) take no input connections which can be confusing to users as their is no indication and files will endlessly queue.

Ideally, processors could be registered as invalid should they have a connection where they will not consume any files.  Ideally, the UI will would prevent the connection from even making these connections.  

Processors that do not consume messages could also make use of an annotation akin to @IgnoresInput 



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