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https://issues.apache.org/jira/browse/NIFI-7348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Kawamura resolved NIFI-7348.
---------------------------------
Fix Version/s: 1.12.0
Resolution: Fixed
> FlowFiles re-entering a Wait-processor after they've expired expire
> immediatelly
> --------------------------------------------------------------------------------
>
> Key: NIFI-7348
> URL: https://issues.apache.org/jira/browse/NIFI-7348
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.11.4
> Environment: Windows 10 / Ubuntu
> Reporter: endzeit
> Assignee: endzeit
> Priority: Major
> Labels: easyfix
> Fix For: 1.12.0
>
> Attachments: Wait_processor_expiration_issue.xml
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> We recently noticed a behaviour of the Wait processor that we thought of to
> be a bug.
>
> As the attribute WAIT_START_TIMESTAMP is only removed once the FlowFile
> leaves the processor successfully or failing, it affects FlowFiles that
> expire the EXPIRATION_DURATION and re-enter the processor.
> In case the FlowFile enters the same processor again - after expiring
> beforehand - it is transported to the expired output immediately, without
> waiting for the EXPIRATION_DURATION again.
> Is this desired behaviour?
>
> I'll attach a very simple demonstration. Just let it run a minute or two and
> look at the FlowFile attribute "counter" afterwards.
>
> There has been a pull-request addressing a similar issue (NIFI-5892), which
> resulted in the attribute being removed after success and failure. This case
> just seems to haven't been thought about back then. Or was there a reason to
> not clear the attribute after expiration? I couldn't find a mention regarding
> expiration in the issue.
>
> As this should be a very easy fix I would love to contribute, once you
> confirm this is not intentional.
>
> *Current workaround:*
> simply remove the attribute WAIT_START_TIMESTAMP after the FlowFile leaves
> the Wait processor, e.g. using an UpdateAttribute processor
>
> *Edit 2020-04-13:*
> Also this seems to have the side effect of NOT documenting the repeated
> processing. There is no provenance entry added when re-entering the processor
> and expiring immediately, leading to the error being harder to trace.
> Because of this I reset the priority to "Major", which seems to be the
> default anyway.
>
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