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https://issues.apache.org/jira/browse/NIFI-1376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15091036#comment-15091036
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Joseph Witt commented on NIFI-1376:
-----------------------------------

[~rpmiskin] I see what you mean given the bulletin comment.  The intent would 
certainly be that provenance data is available as a live part of the flow but 
we are not using that as a live in-flow thing yet so your ideas around the log 
are valuable.  I do think the second code snippet you provided is the right 
idea/concept though the provenance data would be less about debugging at a code 
level and more about understanding at a user level so the stack traces would 
have no place in provenance but certainly do in logs.

Thanks for explaining the perspective a bit more.

JOe

> Provide access to logged messages from TestRunner
> -------------------------------------------------
>
>                 Key: NIFI-1376
>                 URL: https://issues.apache.org/jira/browse/NIFI-1376
>             Project: Apache NiFi
>          Issue Type: Improvement
>    Affects Versions: 0.4.1
>            Reporter: Richard Miskin
>            Priority: Minor
>             Fix For: 0.5.0
>
>
> It would be useful to be able to verify the log messages raised by Processors 
> and ControllerServices during tests.
> As an example use case, imagine a processor with multiple possible errors 
> that should cause a flow file to be transferred to a failure Relationship, 
> but different messages should be logged.



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