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https://issues.apache.org/jira/browse/NIFI-14658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18116067#comment-18116067
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Matt Burgess commented on NIFI-14658:
-------------------------------------
This Jira and NIFI-4621 and NIFI-9703 are all duplicates of each other.
In general, the properties of a processor (and the ability to configure the
values via parameters) are the NiFi equivalent of an Initial Information Packet
(IIP) in the Flow-Based Programming (FBP) paradigm. Allowing incoming
connections for the purpose of dynamically configuring the processor would be
the NiFi equivalent of the OPTIONS input port in FBP. Not having an OPTIONS
input port in NiFi was a design choice by the original authors of NiFi.
Allowing incoming connections to source processors for the purposes of
configuration would certainly be useful, but there are many things to consider.
A big one is that many source processors (such as the List processors) are
stateful, so the amount of state that could be stored could explode with the
number of different configurations of the processor. This implies that we'd
also need fine-grained state control (rather than just wiping the whole thing
out), possible age-off capabilities, etc. Alternatively a change in config
could indicate an automatic clearing of state, but what if I periodically want
to list files from two different directories? The change in config would wipe
the state of the first directory, and changing it back would wipe the second,
and neither would pick up where they left off. Without automatically clearing
state, if I wanted to list thousands of directories, I'd have to keep thousands
of "state sets".
As this discussion is not specific to ListSFTP (and not even just for List
processors but all source processors), I recommend a NiFi Improvement Proposal
([NIP|https://issues.apache.org/jira/projects/NIP/summary]) Jira to have the
broader discussion.
> ListSFTP FlowFile Input Trigger
> -------------------------------
>
> Key: NIFI-14658
> URL: https://issues.apache.org/jira/browse/NIFI-14658
> Project: Apache NiFi
> Issue Type: Wish
> Reporter: Divashan Naicker
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Would it be possible for future iterations of the ListSFTP processors to have
> the capability to be triggered by a flowfile input?
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