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https://issues.apache.org/jira/browse/NIFI-4298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe Witt resolved NIFI-4298.
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Fix Version/s: 2.0.0-M3
Resolution: Fixed
> NiFi allows users to remove critical Attributes that are needed by processors.
> ------------------------------------------------------------------------------
>
> Key: NIFI-4298
> URL: https://issues.apache.org/jira/browse/NIFI-4298
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.2.0
> Reporter: Matthew Clarke
> Priority: Major
> Fix For: 2.0.0-M3
>
>
> The UpdateAttribute processor provides users with the ability to provide a
> "Delete Attributes Expression".
> While FlowFile properties entryDate, lineageDate, fileSize, and uuid are
> protected and can not be removed, FlowFile attributes path and filename can
> be removed.
> Removal of these attributes has adverse affects on many other processors.
> Any processor that will write a FlowFile out requires the filename attribute.
> In addition, I have found that the MergeContent processor (configured to use
> FlowFileStreams as the merge strategy). also, for whatever reason, requires
> that the path attribute exists on the FlowFile.
> If this attribute is missing, a NPE is thrown and the session is rolled back.
> 2017-08-14 19:27:00,156 ERROR [Timer-Driven Process Thread-7]
> o.a.n.processors.standard.MergeContent
> MergeContent[id=d7213e1f-0c03-1715-93cc-b1be9228ec36] Failed to process
> bundle of 1 files due to java.lang.NullPointerException; rolling back
> sessions: {}
> A stack trace is not produced even if DEBUG is enabled for this processor.
> NiFi needs to prevent users from being able to remove attributes which may be
> "required" by other processors.
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