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https://issues.apache.org/jira/browse/NIFI-13200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17845158#comment-17845158
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Mark Payne commented on NIFI-13200:
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Yup good catch, [~mosermw]
> Framework should not allow removal of 'filename' or 'path' attributes
> ---------------------------------------------------------------------
>
> Key: NIFI-13200
> URL: https://issues.apache.org/jira/browse/NIFI-13200
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 2.0.0-M3
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Currently, the framework prevents processors from removing the 'uuid'
> attribute. However, it does allow any other attribute to be removed. However,
> there are many processors that assume that the 'filename' and 'path'
> attributes exist, and they are intended always to exist - they are even
> assigned values when the FlowFile is created. We should ensure that these
> attributes cannot be removed.
> Otherwise, configuring UpdateAttribute to remove these attributes can cause
> follow-on processors to fail with unexpected NullPointerExceptions
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