Matthew Clarke created NIFI-4298:
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Summary: 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
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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