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https://issues.apache.org/jira/browse/NIFI-5892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725653#comment-16725653
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Lars Birger Aasheim commented on NIFI-5892:
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To solve the described problem, yes, but I guess there is no reason not to 
remove all wait.* attributes upon routing to the success relationship. This 
could be optional though, controlled by a true/false option in the processor. 
Personally I think such an option should be set to true by default (remove 
wait.* attributes).

> Wait timestamp lingers, potentially messing up downstream wait-notify pairs
> ---------------------------------------------------------------------------
>
>                 Key: NIFI-5892
>                 URL: https://issues.apache.org/jira/browse/NIFI-5892
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Lars Birger Aasheim
>            Assignee: Otto Fowler
>            Priority: Minor
>         Attachments: TestLingeringWaitTimestamps.xml
>
>
> The Wait processor makes use of the attribute "wait.start.timestamp" to keep 
> track of when it first encountered a flowfile. The observed behaviour is that 
> this attribute is set only if it does not exist, if else it is just checked 
> against the current time. With several wait-notify pairs in succession, there 
> is a likelihood that a flowfile will be routed directly to "expired" in one 
> of the downstream Wait processors due to a timestamp set upstream of it. I 
> suggest allowing an option of deleting the timestamp once a file is routed to 
> success (and perhaps also to expired). Currently I do this manually with an 
> UpdateAttribute processor.
>  
> Attached is a template with necessary components and also an explanation of 
> how to reproduce the issue.



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