[jira] [Commented] (NIFI-4298) NiFi allows users to remove critical Attributes that are needed by processors.

["Michael W Moser (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-4298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723953#comment-17723953 ] 

Michael W Moser commented on NIFI-4298:
---------------------------------------

NIFI-8971 partially resolves this, by fixing the specific MergeContent problem in the description.

> 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
>
> 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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