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https://issues.apache.org/jira/browse/NIFI-813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580442#comment-16580442
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Michael Moser commented on NIFI-813:
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Right on, hehe. This ticket was first!
> UpdateAttribute does not have a failure relationship for handling EL failures
> -----------------------------------------------------------------------------
>
> Key: NIFI-813
> URL: https://issues.apache.org/jira/browse/NIFI-813
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework, Extensions
> Affects Versions: 0.2.1
> Reporter: Aldrin Piri
> Priority: Major
> Attachments: NIFI-813_Example.xml
>
>
> UpdateAttribute's genesis predates expression language, and as originally
> created would have made failure improbable (impossible?) in context of
> typical processing. As a result, when EL was introduced, there was also a
> means wherein the processor could fail. Currently, there is no failure
> relationship. As a result, the only way to remove files that are failing due
> to an EL issues and placed back onto the queue is through an expiration on
> the incoming connection. One particular instance is that of formatting a bad
> date input. Template showing example to follow.
> It could be the case this is a deficiency in just this particular EL
> function, but should EL become an extension point, it is entirely conceivable
> that failure cases become an occurrence that needs to be handled.
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